This is the mail archive of the
gdb-patches@sourceware.org
mailing list for the GDB project.
Re: [commit] arm reversible : <phase_2>
Hi Tom, Yao, Petr,
Thank you very much for your valuable inputs for this patch, It is in now.
Thanks Tom for all your support.
As I started this patch with Michael Snyder; I would like to dedicate
the work to him.
PS: I will be starting the phase 3; which would support syscall,
singal record, and would be solving any existing bugs in phase 2 if
any.
Warm Regards,
Oza.
On 3/27/12, oza Pawandeep <oza.pawandeep@gmail.com> wrote:
> PATCH STARTS
> ------------------------
>
> diff -urN arm_orig/ChangeLog arm_new/ChangeLog
> --- arm_orig/ChangeLog 2011-12-03 18:05:04.000000000 +0530
> +++ arm_new/ChangeLog 2011-12-04 23:36:50.000000000 +0530
> @@ -1,3 +1,37 @@
> +2011-12-03 Oza Pawandeep <oza.pawandeep@gmail.com>
> +
> + * arm-linux-tdep.c (arm_linux_init_abi): Call
> + set_gdbarch_process_record.
> + Initialize `arm_swi_record' field.
> +
> + * arm-tdep.c (arm_process_record): New function.
> + (deallocate_reg_mem): New function.
> + (decode_insn): New function.
> + (thumb_record_branch): New function.
> + (thumb_record_ldm_stm_swi(): New function.
> + (thumb_record_misc): New function.
> + (thumb_record_ld_st_stack): New function.
> + (thumb_record_ld_st_imm_offset): New function.
> + (thumb_record_ld_st_reg_offset(): New function.
> + (thumb_record_add_sub_cmp_mov): New function.
> + (thumb_record_shift_add_sub): New function.
> + (arm_record_coproc_data_proc): New function.
> + (arm_record_coproc): New function.
> + (arm_record_b_bl): New function.
> + (arm_record_ld_st_multiple): New function.
> + (arm_record_ld_st_reg_offset): New function.
> + (arm_record_ld_st_imm_offset): New function.
> + (arm_record_data_proc_imm): New function.
> + (arm_record_data_proc_misc_ld_str): New function.
> + (arm_record_extension_space): New function.
> + (arm_record_strx): New function.
> + (sbo_sbz): New function.
> + (struct insn_decode_record): New structure for arm insn record.
> + (REG_ALLOC): New macro for reg allocations.
> + (MEM_ALLOC): New macro for memory allocations.
> +
> + * arm-tdep.h (struct gdbarch_tdep): New field 'arm_swi_record'
> +
> 2011-11-09 Roland McGrath <mcgrathr@google.com>
>
> * configure.ac: Add tool checks for READELF and READELF_FOR_TARGET.
> diff -urN arm_orig/NEWS arm_new/NEWS
> --- arm_orig/NEWS 2011-12-28 12:25:47.000000000 +0530
> +++ arm_new/NEWS 2011-12-28 12:32:10.000000000 +0530
> @@ -3,6 +3,10 @@
>
> *** Changes since GDB 7.3.1
>
> +* GDB now supports reversible debugging on ARM, it allows you to
> + debug basic ARM and THUMB instructions, and provides
> + record/replay support.
> +
> * GDB now allows you to skip uninteresting functions and files when
> stepping with the "skip function" and "skip file" commands.
>
> diff -urN arm_orig/arm-linux-tdep.c arm_new/arm-linux-tdep.c
> --- arm_orig/arm-linux-tdep.c 2011-12-03 18:06:39.000000000 +0530
> +++ arm_new/arm-linux-tdep.c 2011-12-03 19:28:27.000000000 +0530
> @@ -1148,8 +1148,14 @@
> simple_displaced_step_free_closure);
> set_gdbarch_displaced_step_location (gdbarch,
> displaced_step_at_entry_point);
>
> + /* Reversible debugging, process record. */
> + set_gdbarch_process_record (gdbarch, arm_process_record);
> +
>
> tdep->syscall_next_pc = arm_linux_syscall_next_pc;
> +
> + /* Syscall record. */
> + tdep->arm_swi_record = NULL;
> }
>
> /* Provide a prototype to silence -Wmissing-prototypes. */
> diff -urN arm_orig/arm-tdep.c arm_new/arm-tdep.c
> --- arm_orig/arm-tdep.c 2011-12-03 20:05:03.000000000 +0530
> +++ arm_new/arm-tdep.c 2012-01-05 16:24:25.000000000 +0530
> @@ -55,6 +55,8 @@
> #include "gdb_assert.h"
> #include "vec.h"
>
> +#include "record.h"
> +
> #include "features/arm-with-m.c"
> #include "features/arm-with-iwmmxt.c"
> #include "features/arm-with-vfpv2.c"
> @@ -10175,3 +10177,2063 @@
> NULL, /* FIXME: i18n: "ARM debugging is %s. */
> &setdebuglist, &showdebuglist);
> }
> +
> +/* ARM-reversible process record data structures. */
> +
> +#define ARM_INSN_SIZE_BYTES 4
> +#define THUMB_INSN_SIZE_BYTES 2
> +#define THUMB2_INSN_SIZE_BYTES 4
> +
> +
> +#define INSN_S_L_BIT_NUM 20
> +
> +#define REG_ALLOC(REGS, LENGTH, RECORD_BUF) \
> + do \
> + { \
> + unsigned int reg_len = LENGTH; \
> + if (reg_len) \
> + { \
> + REGS = XNEWVEC (uint32_t, reg_len); \
> + memcpy(®S[0], &RECORD_BUF[0], sizeof(uint32_t)*LENGTH);
> \
> + } \
> + } \
> + while (0)
> +
> +#define MEM_ALLOC(MEMS, LENGTH, RECORD_BUF) \
> + do \
> + { \
> + unsigned int mem_len = LENGTH; \
> + if (mem_len) \
> + { \
> + MEMS = XNEWVEC (struct arm_mem_r, mem_len); \
> + memcpy(&MEMS->len, &RECORD_BUF[0], \
> + sizeof(struct arm_mem_r) * LENGTH); \
> + } \
> + } \
> + while (0)
> +
> +/* Checks whether insn is already recorded or yet to be decoded.
> (boolean expression). */
> +#define INSN_RECORDED(ARM_RECORD) \
> + (0 != (ARM_RECORD)->reg_rec_count || 0 !=
> (ARM_RECORD)->mem_rec_count)
> +
> +/* ARM memory record structure. */
> +struct arm_mem_r
> +{
> + uint32_t len; /* Record length. */
> + CORE_ADDR addr; /* Memory address. */
> +};
> +
> +/* ARM instruction record contains opcode of current insn
> + and execution state (before entry to decode_insn()),
> + contains list of to-be-modified registers and
> + memory blocks (on return from decode_insn()). */
> +
> +typedef struct insn_decode_record_t
> +{
> + struct gdbarch *gdbarch;
> + struct regcache *regcache;
> + CORE_ADDR this_addr; /* Address of the insn being decoded. */
> + uint32_t arm_insn; /* Should accommodate thumb. */
> + uint32_t cond; /* Condition code. */
> + uint32_t opcode; /* Insn opcode. */
> + uint32_t decode; /* Insn decode bits. */
> + uint32_t mem_rec_count; /* No of mem records. */
> + uint32_t reg_rec_count; /* No of reg records. */
> + uint32_t *arm_regs; /* Registers to be saved for this record.
> */
> + struct arm_mem_r *arm_mems; /* Memory to be saved for this record. */
> +} insn_decode_record;
> +
> +
> +/* Checks ARM SBZ and SBO mandatory fields. */
> +
> +static int
> +sbo_sbz (uint32_t insn, uint32_t bit_num, uint32_t len, uint32_t sbo)
> +{
> + uint32_t ones = bits (insn, bit_num - 1, (bit_num -1) + (len - 1));
> +
> + if (!len)
> + return 1;
> +
> + if (!sbo)
> + ones = ~ones;
> +
> + while (ones)
> + {
> + if (!(ones & sbo))
> + {
> + return 0;
> + }
> + ones = ones >> 1;
> + }
> + return 1;
> +}
> +
> +typedef enum
> +{
> + ARM_RECORD_STRH=1,
> + ARM_RECORD_STRD
> +} arm_record_strx_t;
> +
> +typedef enum
> +{
> + ARM_RECORD=1,
> + THUMB_RECORD,
> + THUMB2_RECORD
> +} record_type_t;
> +
> +
> +static int
> +arm_record_strx (insn_decode_record *arm_insn_r, uint32_t *record_buf,
> + uint32_t *record_buf_mem, arm_record_strx_t str_type)
> +{
> +
> + struct regcache *reg_cache = arm_insn_r->regcache;
> + ULONGEST u_regval[2]= {0};
> +
> + uint32_t reg_src1 = 0, reg_src2 = 0;
> + uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0;
> + uint32_t opcode1 = 0;
> +
> + arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
> + arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
> + opcode1 = bits (arm_insn_r->arm_insn, 20, 24);
> +
> +
> + if (14 == arm_insn_r->opcode || 10 == arm_insn_r->opcode)
> + {
> + /* 1) Handle misc store, immediate offset. */
> + immed_low = bits (arm_insn_r->arm_insn, 0, 3);
> + immed_high = bits (arm_insn_r->arm_insn, 8, 11);
> + reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
> + regcache_raw_read_unsigned (reg_cache, reg_src1,
> + &u_regval[0]);
> + if (ARM_PC_REGNUM == reg_src1)
> + {
> + /* If R15 was used as Rn, hence current PC+8. */
> + u_regval[0] = u_regval[0] + 8;
> + }
> + offset_8 = (immed_high << 4) | immed_low;
> + /* Calculate target store address. */
> + if (14 == arm_insn_r->opcode)
> + {
> + tgt_mem_addr = u_regval[0] + offset_8;
> + }
> + else
> + {
> + tgt_mem_addr = u_regval[0] - offset_8;
> + }
> + if (ARM_RECORD_STRH == str_type)
> + {
> + record_buf_mem[0] = 2;
> + record_buf_mem[1] = tgt_mem_addr;
> + arm_insn_r->mem_rec_count = 1;
> + }
> + else if (ARM_RECORD_STRD == str_type)
> + {
> + record_buf_mem[0] = 4;
> + record_buf_mem[1] = tgt_mem_addr;
> + record_buf_mem[2] = 4;
> + record_buf_mem[3] = tgt_mem_addr + 4;
> + arm_insn_r->mem_rec_count = 2;
> + }
> + }
> + else if (12 == arm_insn_r->opcode || 8 == arm_insn_r->opcode)
> + {
> + /* 2) Store, register offset. */
> + /* Get Rm. */
> + reg_src1 = bits (arm_insn_r->arm_insn, 0, 3);
> + /* Get Rn. */
> + reg_src2 = bits (arm_insn_r->arm_insn, 16, 19);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
> + regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
> + if (15 == reg_src2)
> + {
> + /* If R15 was used as Rn, hence current PC+8. */
> + u_regval[0] = u_regval[0] + 8;
> + }
> + /* Calculate target store address, Rn +/- Rm, register offset. */
> + if (12 == arm_insn_r->opcode)
> + {
> + tgt_mem_addr = u_regval[0] + u_regval[1];
> + }
> + else
> + {
> + tgt_mem_addr = u_regval[1] - u_regval[0];
> + }
> + if (ARM_RECORD_STRH == str_type)
> + {
> + record_buf_mem[0] = 2;
> + record_buf_mem[1] = tgt_mem_addr;
> + arm_insn_r->mem_rec_count = 1;
> + }
> + else if (ARM_RECORD_STRD == str_type)
> + {
> + record_buf_mem[0] = 4;
> + record_buf_mem[1] = tgt_mem_addr;
> + record_buf_mem[2] = 4;
> + record_buf_mem[3] = tgt_mem_addr + 4;
> + arm_insn_r->mem_rec_count = 2;
> + }
> + }
> + else if (11 == arm_insn_r->opcode || 15 == arm_insn_r->opcode
> + || 2 == arm_insn_r->opcode || 6 == arm_insn_r->opcode)
> + {
> + /* 3) Store, immediate pre-indexed. */
> + /* 5) Store, immediate post-indexed. */
> + immed_low = bits (arm_insn_r->arm_insn, 0, 3);
> + immed_high = bits (arm_insn_r->arm_insn, 8, 11);
> + offset_8 = (immed_high << 4) | immed_low;
> + reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
> + /* Calculate target store address, Rn +/- Rm, register offset. */
> + if (15 == arm_insn_r->opcode || 6 == arm_insn_r->opcode)
> + {
> + tgt_mem_addr = u_regval[0] + offset_8;
> + }
> + else
> + {
> + tgt_mem_addr = u_regval[0] - offset_8;
> + }
> + if (ARM_RECORD_STRH == str_type)
> + {
> + record_buf_mem[0] = 2;
> + record_buf_mem[1] = tgt_mem_addr;
> + arm_insn_r->mem_rec_count = 1;
> + }
> + else if (ARM_RECORD_STRD == str_type)
> + {
> + record_buf_mem[0] = 4;
> + record_buf_mem[1] = tgt_mem_addr;
> + record_buf_mem[2] = 4;
> + record_buf_mem[3] = tgt_mem_addr + 4;
> + arm_insn_r->mem_rec_count = 2;
> + }
> + /* Record Rn also as it changes. */
> + *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (9 == arm_insn_r->opcode || 13 == arm_insn_r->opcode
> + || 0 == arm_insn_r->opcode || 4 == arm_insn_r->opcode)
> + {
> + /* 4) Store, register pre-indexed. */
> + /* 6) Store, register post -indexed. */
> + reg_src1 = bits (arm_insn_r->arm_insn, 0, 3);
> + reg_src2 = bits (arm_insn_r->arm_insn, 16, 19);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
> + regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
> + /* Calculate target store address, Rn +/- Rm, register offset. */
> + if (13 == arm_insn_r->opcode || 4 == arm_insn_r->opcode)
> + {
> + tgt_mem_addr = u_regval[0] + u_regval[1];
> + }
> + else
> + {
> + tgt_mem_addr = u_regval[1] - u_regval[0];
> + }
> + if (ARM_RECORD_STRH == str_type)
> + {
> + record_buf_mem[0] = 2;
> + record_buf_mem[1] = tgt_mem_addr;
> + arm_insn_r->mem_rec_count = 1;
> + }
> + else if (ARM_RECORD_STRD == str_type)
> + {
> + record_buf_mem[0] = 4;
> + record_buf_mem[1] = tgt_mem_addr;
> + record_buf_mem[2] = 4;
> + record_buf_mem[3] = tgt_mem_addr + 4;
> + arm_insn_r->mem_rec_count = 2;
> + }
> + /* Record Rn also as it changes. */
> + *(record_buf) = bits (arm_insn_r->arm_insn, 16, 19);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + return 0;
> +}
> +
> +/* Handling ARM extension space insns. */
> +
> +static int
> +arm_record_extension_space (insn_decode_record *arm_insn_r)
> +{
> + uint32_t ret = 0; /* Return value: -1:record failure ; 0:success */
> + uint32_t opcode1 = 0, opcode2 = 0, insn_op1 = 0;
> + uint32_t record_buf[8], record_buf_mem[8];
> + uint32_t reg_src1 = 0;
> + uint32_t immed_high = 0, immed_low = 0,offset_8 = 0, tgt_mem_addr = 0;
> + struct regcache *reg_cache = arm_insn_r->regcache;
> + ULONGEST u_regval = 0;
> +
> + gdb_assert (!INSN_RECORDED(arm_insn_r));
> + /* Handle unconditional insn extension space. */
> +
> + opcode1 = bits (arm_insn_r->arm_insn, 20, 27);
> + opcode2 = bits (arm_insn_r->arm_insn, 4, 7);
> + if (arm_insn_r->cond)
> + {
> + /* PLD has no affect on architectural state, it just affects
> + the caches. */
> + if (5 == ((opcode1 & 0xE0) >> 5))
> + {
> + /* BLX(1) */
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = ARM_LR_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + /* STC2, LDC2, MCR2, MRC2, CDP2: <TBD>, co-processor insn. */
> + }
> +
> +
> + opcode1 = bits (arm_insn_r->arm_insn, 25, 27);
> + if (3 == opcode1 && bit (arm_insn_r->arm_insn, 4))
> + {
> + ret = -1;
> + /* Undefined instruction on ARM V5; need to handle if later
> + versions define it. */
> + }
> +
> + opcode1 = bits (arm_insn_r->arm_insn, 24, 27);
> + opcode2 = bits (arm_insn_r->arm_insn, 4, 7);
> + insn_op1 = bits (arm_insn_r->arm_insn, 20, 23);
> +
> + /* Handle arithmetic insn extension space. */
> + if (!opcode1 && 9 == opcode2 && 1 != arm_insn_r->cond
> + && !INSN_RECORDED(arm_insn_r))
> + {
> + /* Handle MLA(S) and MUL(S). */
> + if (0 <= insn_op1 && 3 >= insn_op1)
> + {
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + record_buf[1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else if (4 <= insn_op1 && 15 >= insn_op1)
> + {
> + /* Handle SMLAL(S), SMULL(S), UMLAL(S), UMULL(S). */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19);
> + record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15);
> + record_buf[2] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 3;
> + }
> + }
> +
> + opcode1 = bits (arm_insn_r->arm_insn, 26, 27);
> + opcode2 = bits (arm_insn_r->arm_insn, 23, 24);
> + insn_op1 = bits (arm_insn_r->arm_insn, 21, 22);
> +
> + /* Handle control insn extension space. */
> +
> + if (!opcode1 && 2 == opcode2 && !bit (arm_insn_r->arm_insn, 20)
> + && 1 != arm_insn_r->cond && !INSN_RECORDED(arm_insn_r))
> + {
> + if (!bit (arm_insn_r->arm_insn,25))
> + {
> + if (!bits (arm_insn_r->arm_insn, 4, 7))
> + {
> + if ((0 == insn_op1) || (2 == insn_op1))
> + {
> + /* MRS. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (1 == insn_op1)
> + {
> + /* CSPR is going to be changed. */
> + record_buf[0] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (3 == insn_op1)
> + {
> + /* SPSR is going to be changed. */
> + /* We need to get SPSR value, which is yet to be done.
> */
> + printf_unfiltered (_("Process record does not support "
> + "instruction 0x%0x at address
> %s.\n"),
> + arm_insn_r->arm_insn,
> + paddress (arm_insn_r->gdbarch,
> + arm_insn_r->this_addr));
> + return -1;
> + }
> + }
> + else if (1 == bits (arm_insn_r->arm_insn, 4, 7))
> + {
> + if (1 == insn_op1)
> + {
> + /* BX. */
> + record_buf[0] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (3 == insn_op1)
> + {
> + /* CLZ. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + }
> + else if (3 == bits (arm_insn_r->arm_insn, 4, 7))
> + {
> + /* BLX. */
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = ARM_LR_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else if (5 == bits (arm_insn_r->arm_insn, 4, 7))
> + {
> + /* QADD, QSUB, QDADD, QDSUB */
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else if (7 == bits (arm_insn_r->arm_insn, 4, 7))
> + {
> + /* BKPT. */
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = ARM_LR_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> +
> + /* Save SPSR also;how? */
> + printf_unfiltered (_("Process record does not support "
> + "instruction 0x%0x at address %s.\n"),
> + arm_insn_r->arm_insn,
> + paddress (arm_insn_r->gdbarch, arm_insn_r->this_addr));
> + return -1;
> + }
> + else if(8 == bits (arm_insn_r->arm_insn, 4, 7)
> + || 10 == bits (arm_insn_r->arm_insn, 4, 7)
> + || 12 == bits (arm_insn_r->arm_insn, 4, 7)
> + || 14 == bits (arm_insn_r->arm_insn, 4, 7)
> + )
> + {
> + if (0 == insn_op1 || 1 == insn_op1)
> + {
> + /* SMLA<x><y>, SMLAW<y>, SMULW<y>. */
> + /* We dont do optimization for SMULW<y> where we
> + need only Rd. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + record_buf[1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else if (2 == insn_op1)
> + {
> + /* SMLAL<x><y>. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + record_buf[1] = bits (arm_insn_r->arm_insn, 16, 19);
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else if (3 == insn_op1)
> + {
> + /* SMUL<x><y>. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + }
> + }
> + else
> + {
> + /* MSR : immediate form. */
> + if (1 == insn_op1)
> + {
> + /* CSPR is going to be changed. */
> + record_buf[0] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (3 == insn_op1)
> + {
> + /* SPSR is going to be changed. */
> + /* we need to get SPSR value, which is yet to be done */
> + printf_unfiltered (_("Process record does not support "
> + "instruction 0x%0x at address %s.\n"),
> + arm_insn_r->arm_insn,
> + paddress (arm_insn_r->gdbarch,
> + arm_insn_r->this_addr));
> + return -1;
> + }
> + }
> + }
> +
> + opcode1 = bits (arm_insn_r->arm_insn, 25, 27);
> + opcode2 = bits (arm_insn_r->arm_insn, 20, 24);
> + insn_op1 = bits (arm_insn_r->arm_insn, 5, 6);
> +
> + /* Handle load/store insn extension space. */
> +
> + if (!opcode1 && bit (arm_insn_r->arm_insn, 7)
> + && bit (arm_insn_r->arm_insn, 4) && 1 != arm_insn_r->cond
> + && !INSN_RECORDED(arm_insn_r))
> + {
> + /* SWP/SWPB. */
> + if (0 == insn_op1)
> + {
> + /* These insn, changes register and memory as well. */
> + /* SWP or SWPB insn. */
> + /* Get memory address given by Rn. */
> + reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
> + /* SWP insn ?, swaps word. */
> + if (8 == arm_insn_r->opcode)
> + {
> + record_buf_mem[0] = 4;
> + }
> + else
> + {
> + /* SWPB insn, swaps only byte. */
> + record_buf_mem[0] = 1;
> + }
> + record_buf_mem[1] = u_regval;
> + arm_insn_r->mem_rec_count = 1;
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (1 == insn_op1 && !bit (arm_insn_r->arm_insn, 20))
> + {
> + /* STRH. */
> + arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0],
> + ARM_RECORD_STRH);
> + }
> + else if (2 == insn_op1 && !bit (arm_insn_r->arm_insn, 20))
> + {
> + /* LDRD. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + record_buf[1] = record_buf[0] + 1;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else if (3 == insn_op1 && !bit (arm_insn_r->arm_insn, 20))
> + {
> + /* STRD. */
> + arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0],
> + ARM_RECORD_STRD);
> + }
> + else if (bit (arm_insn_r->arm_insn, 20) && insn_op1 <= 3)
> + {
> + /* LDRH, LDRSB, LDRSH. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> +
> + }
> +
> + opcode1 = bits (arm_insn_r->arm_insn, 23, 27);
> + if (24 == opcode1 && bit (arm_insn_r->arm_insn, 21)
> + && !INSN_RECORDED(arm_insn_r))
> + {
> + ret = -1;
> + /* Handle coprocessor insn extension space. */
> + }
> +
> + /* To be done for ARMv5 and later; as of now we return -1. */
> + if (-1 == ret)
> + printf_unfiltered (_("Process record does not support instruction x%0x
> "
> + "at address %s.\n"),arm_insn_r->arm_insn,
> + paddress (arm_insn_r->gdbarch,
> arm_insn_r->this_addr));
> +
> +
> + REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
> + MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count,
> record_buf_mem);
> +
> + return ret;
> +}
> +
> +/* Handling opcode 000 insns. */
> +
> +static int
> +arm_record_data_proc_misc_ld_str (insn_decode_record *arm_insn_r)
> +{
> + struct regcache *reg_cache = arm_insn_r->regcache;
> + uint32_t record_buf[8], record_buf_mem[8];
> + ULONGEST u_regval[2] = {0};
> +
> + uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0;
> + uint32_t immed_high = 0, immed_low = 0, offset_8 = 0, tgt_mem_addr = 0;
> + uint32_t opcode1 = 0;
> +
> + arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
> + arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
> + opcode1 = bits (arm_insn_r->arm_insn, 20, 24);
> +
> + /* Data processing insn /multiply insn. */
> + if (9 == arm_insn_r->decode
> + && ((4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode)
> + || (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode)))
> + {
> + /* Handle multiply instructions. */
> + /* MLA, MUL, SMLAL, SMULL, UMLAL, UMULL. */
> + if (0 == arm_insn_r->opcode || 1 == arm_insn_r->opcode)
> + {
> + /* Handle MLA and MUL. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19);
> + record_buf[1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else if (4 <= arm_insn_r->opcode && 7 >= arm_insn_r->opcode)
> + {
> + /* Handle SMLAL, SMULL, UMLAL, UMULL. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 16, 19);
> + record_buf[1] = bits (arm_insn_r->arm_insn, 12, 15);
> + record_buf[2] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 3;
> + }
> + }
> + else if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)
> + && (11 == arm_insn_r->decode || 13 == arm_insn_r->decode))
> + {
> + /* Handle misc load insns, as 20th bit (L = 1). */
> + /* LDR insn has a capability to do branching, if
> + MOV LR, PC is precceded by LDR insn having Rn as R15
> + in that case, it emulates branch and link insn, and hence we
> + need to save CSPR and PC as well. I am not sure this is right
> + place; as opcode = 010 LDR insn make this happen, if R15 was
> + used. */
> + reg_dest = bits (arm_insn_r->arm_insn, 12, 15);
> + if (15 != reg_dest)
> + {
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else
> + {
> + record_buf[0] = reg_dest;
> + record_buf[1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + }
> + else if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode)
> + && sbo_sbz (arm_insn_r->arm_insn, 5, 12, 0)
> + && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1)
> + && 2 == bits (arm_insn_r->arm_insn, 20, 21))
> + {
> + /* Handle MSR insn. */
> + if (9 == arm_insn_r->opcode)
> + {
> + /* CSPR is going to be changed. */
> + record_buf[0] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else
> + {
> + /* SPSR is going to be changed. */
> + /* How to read SPSR value? */
> + printf_unfiltered (_("Process record does not support instruction
> "
> + "0x%0x at address %s.\n"),
> + arm_insn_r->arm_insn,
> + paddress (arm_insn_r->gdbarch,
> arm_insn_r->this_addr));
> + return -1;
> + }
> + }
> + else if (9 == arm_insn_r->decode
> + && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode)
> + && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
> + {
> + /* Handling SWP, SWPB. */
> + /* These insn, changes register and memory as well. */
> + /* SWP or SWPB insn. */
> +
> + reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
> + /* SWP insn ?, swaps word. */
> + if (8 == arm_insn_r->opcode)
> + {
> + record_buf_mem[0] = 4;
> + }
> + else
> + {
> + /* SWPB insn, swaps only byte. */
> + record_buf_mem[0] = 1;
> + }
> + record_buf_mem[1] = u_regval[0];
> + arm_insn_r->mem_rec_count = 1;
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (3 == arm_insn_r->decode && 0x12 == opcode1
> + && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1))
> + {
> + /* Handle BLX, branch and link/exchange. */
> + if (9 == arm_insn_r->opcode)
> + {
> + /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm,
> + and R14 stores the return address. */
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = ARM_LR_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + }
> + else if (7 == arm_insn_r->decode && 0x12 == opcode1)
> + {
> + /* Handle enhanced software breakpoint insn, BKPT. */
> + /* CPSR is changed to be executed in ARM state, disabling normal
> + interrupts, entering abort mode. */
> + /* According to high vector configuration PC is set. */
> + /* user hit breakpoint and type reverse, in
> + that case, we need to go back with previous CPSR and
> + Program Counter. */
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = ARM_LR_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> +
> + /* Save SPSR also; how? */
> + printf_unfiltered (_("Process record does not support instruction "
> + "0x%0x at address %s.\n"),arm_insn_r->arm_insn,
> + paddress (arm_insn_r->gdbarch,
> + arm_insn_r->this_addr));
> + return -1;
> + }
> + else if (11 == arm_insn_r->decode
> + && !bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
> + {
> + /* Handle enhanced store insns and DSP insns (e.g. LDRD). */
> +
> + /* Handle str(x) insn */
> + arm_record_strx(arm_insn_r, &record_buf[0], &record_buf_mem[0],
> + ARM_RECORD_STRH);
> + }
> + else if (1 == arm_insn_r->decode && 0x12 == opcode1
> + && sbo_sbz (arm_insn_r->arm_insn, 9, 12, 1))
> + {
> + /* Handle BX, branch and link/exchange. */
> + /* Branch is chosen by setting T bit of CSPR, bitp[0] of Rm. */
> + record_buf[0] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (1 == arm_insn_r->decode && 0x16 == opcode1
> + && sbo_sbz (arm_insn_r->arm_insn, 9, 4, 1)
> + && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1))
> + {
> + /* Count leading zeros: CLZ. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (!bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM)
> + && (8 == arm_insn_r->opcode || 10 == arm_insn_r->opcode)
> + && sbo_sbz (arm_insn_r->arm_insn, 17, 4, 1)
> + && sbo_sbz (arm_insn_r->arm_insn, 1, 12, 0)
> + )
> + {
> + /* Handle MRS insn. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else if (arm_insn_r->opcode <= 15)
> + {
> + /* Normal data processing insns. */
> + /* Out of 11 shifter operands mode, all the insn modifies
> destination
> + register, which is specified by 13-16 decode. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + record_buf[1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else
> + {
> + return -1;
> + }
> +
> + REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
> + MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count,
> record_buf_mem);
> + return 0;
> +}
> +
> +/* Handling opcode 001 insns. */
> +
> +static int
> +arm_record_data_proc_imm (insn_decode_record *arm_insn_r)
> +{
> + uint32_t record_buf[8], record_buf_mem[8];
> +
> + arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
> + arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
> +
> + if ((9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode)
> + && 2 == bits (arm_insn_r->arm_insn, 20, 21)
> + && sbo_sbz (arm_insn_r->arm_insn, 13, 4, 1)
> + )
> + {
> + /* Handle MSR insn. */
> + if (9 == arm_insn_r->opcode)
> + {
> + /* CSPR is going to be changed. */
> + record_buf[0] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else
> + {
> + /* SPSR is going to be changed. */
> + }
> + }
> + else if (arm_insn_r->opcode <= 15)
> + {
> + /* Normal data processing insns. */
> + /* Out of 11 shifter operands mode, all the insn modifies
> destination
> + register, which is specified by 13-16 decode. */
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + record_buf[1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + else
> + {
> + return -1;
> + }
> +
> + REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
> + MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count,
> record_buf_mem);
> + return 0;
> +}
> +
> +/* Handling opcode 010 insns. */
> +
> +static int
> +arm_record_ld_st_imm_offset (insn_decode_record *arm_insn_r)
> +{
> + struct regcache *reg_cache = arm_insn_r->regcache;
> +
> + uint32_t reg_src1 = 0 , reg_dest = 0;
> + uint32_t offset_12 = 0, tgt_mem_addr = 0;
> + uint32_t record_buf[8], record_buf_mem[8];
> +
> + ULONGEST u_regval = 0;
> +
> + arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
> + arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
> +
> + if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
> + {
> + reg_dest = bits (arm_insn_r->arm_insn, 12, 15);
> + /* LDR insn has a capability to do branching, if
> + MOV LR, PC is precedded by LDR insn having Rn as R15
> + in that case, it emulates branch and link insn, and hence we
> + need to save CSPR and PC as well. */
> + if (ARM_PC_REGNUM != reg_dest)
> + {
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else
> + {
> + record_buf[0] = reg_dest;
> + record_buf[1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + }
> + else
> + {
> + /* Store, immediate offset, immediate pre-indexed,
> + immediate post-indexed. */
> + reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
> + offset_12 = bits (arm_insn_r->arm_insn, 0, 11);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
> + /* U == 1 */
> + if (bit (arm_insn_r->arm_insn, 23))
> + {
> + tgt_mem_addr = u_regval + offset_12;
> + }
> + else
> + {
> + tgt_mem_addr = u_regval - offset_12;
> + }
> +
> + switch (arm_insn_r->opcode)
> + {
> + /* STR. */
> + case 8:
> + case 12:
> + /* STR. */
> + case 9:
> + case 13:
> + /* STRT. */
> + case 1:
> + case 5:
> + /* STR. */
> + case 4:
> + case 0:
> + record_buf_mem[0] = 4;
> + break;
> +
> + /* STRB. */
> + case 10:
> + case 14:
> + /* STRB. */
> + case 11:
> + case 15:
> + /* STRBT. */
> + case 3:
> + case 7:
> + /* STRB. */
> + case 2:
> + case 6:
> + record_buf_mem[0] = 1;
> + break;
> +
> + default:
> + gdb_assert_not_reached ("no decoding pattern found");
> + break;
> + }
> + record_buf_mem[1] = tgt_mem_addr;
> + arm_insn_r->mem_rec_count = 1;
> +
> + if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode
> + || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode
> + || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode
> + || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode
> + || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode
> + || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode
> + )
> + {
> + /* We are handling pre-indexed mode; post-indexed mode;
> + where Rn is going to be changed. */
> + record_buf[0] = reg_src1;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + }
> +
> + REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
> + MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count,
> record_buf_mem);
> + return 0;
> +}
> +
> +/* Handling opcode 011 insns. */
> +
> +static int
> +arm_record_ld_st_reg_offset (insn_decode_record *arm_insn_r)
> +{
> + struct regcache *reg_cache = arm_insn_r->regcache;
> +
> + uint32_t shift_imm = 0;
> + uint32_t reg_src1 = 0, reg_src2 = 0, reg_dest = 0;
> + uint32_t offset_12 = 0, tgt_mem_addr = 0;
> + uint32_t record_buf[8], record_buf_mem[8];
> +
> + LONGEST s_word;
> + ULONGEST u_regval[2];
> +
> + arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 21, 24);
> + arm_insn_r->decode = bits (arm_insn_r->arm_insn, 4, 7);
> +
> + /* Handle enhanced store insns and LDRD DSP insn,
> + order begins according to addressing modes for store insns
> + STRH insn. */
> +
> + /* LDR or STR? */
> + if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
> + {
> + reg_dest = bits (arm_insn_r->arm_insn, 12, 15);
> + /* LDR insn has a capability to do branching, if
> + MOV LR, PC is precedded by LDR insn having Rn as R15
> + in that case, it emulates branch and link insn, and hence we
> + need to save CSPR and PC as well. */
> + if (15 != reg_dest)
> + {
> + record_buf[0] = bits (arm_insn_r->arm_insn, 12, 15);
> + arm_insn_r->reg_rec_count = 1;
> + }
> + else
> + {
> + record_buf[0] = reg_dest;
> + record_buf[1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = 2;
> + }
> + }
> + else
> + {
> + if (! bits (arm_insn_r->arm_insn, 4, 11))
> + {
> + /* Store insn, register offset and register pre-indexed,
> + register post-indexed. */
> + /* Get Rm. */
> + reg_src1 = bits (arm_insn_r->arm_insn, 0, 3);
> + /* Get Rn. */
> + reg_src2 = bits (arm_insn_r->arm_insn, 16, 19);
> + regcache_raw_read_unsigned (reg_cache, reg_src1
> + , &u_regval[0]);
> + regcache_raw_read_unsigned (reg_cache, reg_src2
> + , &u_regval[1]);
> + if (15 == reg_src2)
> + {
> + /* If R15 was used as Rn, hence current PC+8. */
> + /* Pre-indexed mode doesnt reach here ; illegal insn. */
> + u_regval[0] = u_regval[0] + 8;
> + }
> + /* Calculate target store address, Rn +/- Rm, register offset.
> */
> + /* U == 1. */
> + if (bit (arm_insn_r->arm_insn, 23))
> + {
> + tgt_mem_addr = u_regval[0] + u_regval[1];
> + }
> + else
> + {
> + tgt_mem_addr = u_regval[1] - u_regval[0];
> + }
> +
> + switch (arm_insn_r->opcode)
> + {
> + /* STR. */
> + case 8:
> + case 12:
> + /* STR. */
> + case 9:
> + case 13:
> + /* STRT. */
> + case 1:
> + case 5:
> + /* STR. */
> + case 0:
> + case 4:
> + record_buf_mem[0] = 4;
> + break;
> +
> + /* STRB. */
> + case 10:
> + case 14:
> + /* STRB. */
> + case 11:
> + case 15:
> + /* STRBT. */
> + case 3:
> + case 7:
> + /* STRB. */
> + case 2:
> + case 6:
> + record_buf_mem[0] = 1;
> + break;
> +
> + default:
> + gdb_assert_not_reached ("no decoding pattern found");
> + break;
> + }
> + record_buf_mem[1] = tgt_mem_addr;
> + arm_insn_r->mem_rec_count = 1;
> +
> + if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode
> + || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode
> + || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode
> + || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode
> + || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode
> + || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode
> + )
> + {
> + /* Rn is going to be changed in pre-indexed mode and
> + post-indexed mode as well. */
> + record_buf[0] = reg_src2;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + }
> + else
> + {
> + /* Store insn, scaled register offset; scaled pre-indexed. */
> + offset_12 = bits (arm_insn_r->arm_insn, 5, 6);
> + /* Get Rm. */
> + reg_src1 = bits (arm_insn_r->arm_insn, 0, 3);
> + /* Get Rn. */
> + reg_src2 = bits (arm_insn_r->arm_insn, 16, 19);
> + /* Get shift_imm. */
> + shift_imm = bits (arm_insn_r->arm_insn, 7, 11);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
> + regcache_raw_read_signed (reg_cache, reg_src1, &s_word);
> + regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
> + /* Offset_12 used as shift. */
> + switch (offset_12)
> + {
> + case 0:
> + /* Offset_12 used as index. */
> + offset_12 = u_regval[0] << shift_imm;
> + break;
> +
> + case 1:
> + offset_12 = (!shift_imm)?0:u_regval[0] >> shift_imm;
> + break;
> +
> + case 2:
> + if (!shift_imm)
> + {
> + if (bit (u_regval[0], 31))
> + {
> + offset_12 = 0xFFFFFFFF;
> + }
> + else
> + {
> + offset_12 = 0;
> + }
> + }
> + else
> + {
> + /* This is arithmetic shift. */
> + offset_12 = s_word >> shift_imm;
> + }
> + break;
> +
> + case 3:
> + if (!shift_imm)
> + {
> + regcache_raw_read_unsigned (reg_cache, ARM_PS_REGNUM,
> + &u_regval[1]);
> + /* Get C flag value and shift it by 31. */
> + offset_12 = (((bit (u_regval[1], 29)) << 31) \
> + | (u_regval[0]) >> 1);
> + }
> + else
> + {
> + offset_12 = (u_regval[0] >> shift_imm) \
> + | (u_regval[0] <<
> + (sizeof(uint32_t) - shift_imm));
> + }
> + break;
> +
> + default:
> + gdb_assert_not_reached ("no decoding pattern found");
> + break;
> + }
> +
> + regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
> + /* bit U set. */
> + if (bit (arm_insn_r->arm_insn, 23))
> + {
> + tgt_mem_addr = u_regval[1] + offset_12;
> + }
> + else
> + {
> + tgt_mem_addr = u_regval[1] - offset_12;
> + }
> +
> + switch (arm_insn_r->opcode)
> + {
> + /* STR. */
> + case 8:
> + case 12:
> + /* STR. */
> + case 9:
> + case 13:
> + /* STRT. */
> + case 1:
> + case 5:
> + /* STR. */
> + case 0:
> + case 4:
> + record_buf_mem[0] = 4;
> + break;
> +
> + /* STRB. */
> + case 10:
> + case 14:
> + /* STRB. */
> + case 11:
> + case 15:
> + /* STRBT. */
> + case 3:
> + case 7:
> + /* STRB. */
> + case 2:
> + case 6:
> + record_buf_mem[0] = 1;
> + break;
> +
> + default:
> + gdb_assert_not_reached ("no decoding pattern found");
> + break;
> + }
> + record_buf_mem[1] = tgt_mem_addr;
> + arm_insn_r->mem_rec_count = 1;
> +
> + if (9 == arm_insn_r->opcode || 11 == arm_insn_r->opcode
> + || 13 == arm_insn_r->opcode || 15 == arm_insn_r->opcode
> + || 0 == arm_insn_r->opcode || 2 == arm_insn_r->opcode
> + || 4 == arm_insn_r->opcode || 6 == arm_insn_r->opcode
> + || 1 == arm_insn_r->opcode || 3 == arm_insn_r->opcode
> + || 5 == arm_insn_r->opcode || 7 == arm_insn_r->opcode
> + )
> + {
> + /* Rn is going to be changed in register scaled pre-indexed
> + mode,and scaled post indexed mode. */
> + record_buf[0] = reg_src2;
> + arm_insn_r->reg_rec_count = 1;
> + }
> + }
> + }
> +
> + REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
> + MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count,
> record_buf_mem);
> + return 0;
> +}
> +
> +/* Handling opcode 100 insns. */
> +
> +static int
> +arm_record_ld_st_multiple (insn_decode_record *arm_insn_r)
> +{
> + struct regcache *reg_cache = arm_insn_r->regcache;
> +
> + uint32_t register_list[16] = {0}, register_count = 0, register_bits = 0;
> + uint32_t reg_src1 = 0, addr_mode = 0, no_of_regs = 0;
> + uint32_t start_address = 0, index = 0;
> + uint32_t record_buf[24], record_buf_mem[48];
> +
> + ULONGEST u_regval[2] = {0};
> +
> + /* This mode is exclusively for load and store multiple. */
> + /* Handle incremenrt after/before and decrment after.before mode;
> + Rn is changing depending on W bit, but as of now we store Rn too
> + without optimization. */
> +
> + if (bit (arm_insn_r->arm_insn, INSN_S_L_BIT_NUM))
> + {
> + /* LDM (1,2,3) where LDM (3) changes CPSR too. */
> +
> + if (bit (arm_insn_r->arm_insn, 20) && !bit (arm_insn_r->arm_insn,
> 22))
> + {
> + register_bits = bits (arm_insn_r->arm_insn, 0, 15);
> + no_of_regs = 15;
> + }
> + else
> + {
> + register_bits = bits (arm_insn_r->arm_insn, 0, 14);
> + no_of_regs = 14;
> + }
> + /* Get Rn. */
> + reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
> + while (register_bits)
> + {
> + if (register_bits & 0x00000001)
> + register_list[register_count++] = 1;
> + register_bits = register_bits >> 1;
> + }
> +
> + /* Extra space for Base Register and CPSR; wihtout optimization.
> */
> + record_buf[register_count] = reg_src1;
> + record_buf[register_count + 1] = ARM_PS_REGNUM;
> + arm_insn_r->reg_rec_count = register_count + 2;
> +
> + for (register_count = 0; register_count < no_of_regs;
> register_count++)
> + {
> + if (register_list[register_count])
> + {
> + /* Register_count gives total no of registers
> + and dually working as reg number. */
> + record_buf[index] = register_count;
> + index++;
> + }
> + }
> +
> + }
> + else
> + {
> + /* It handles both STM(1) and STM(2). */
> + addr_mode = bits (arm_insn_r->arm_insn, 23, 24);
> +
> + register_bits = bits (arm_insn_r->arm_insn, 0, 15);
> + /* Get Rn. */
> + reg_src1 = bits (arm_insn_r->arm_insn, 16, 19);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
> + while (register_bits)
> + {
> + if (register_bits & 0x00000001)
> + register_count++;
> + register_bits = register_bits >> 1;
> + }
> +
> + switch (addr_mode)
> + {
> + /* Decrement after. */
> + case 0:
> + start_address = (u_regval[0]) - (register_count * 4) + 4;
> + arm_insn_r->mem_rec_count = register_count;
> + while (register_count)
> + {
> + record_buf_mem[(register_count * 2) - 1] = start_address;
> + record_buf_mem[(register_count * 2) - 2] = 4;
> + start_address = start_address + 4;
> + register_count--;
> + }
> + break;
> +
> + /* Increment after. */
> + case 1:
> + start_address = u_regval[0];
> + arm_insn_r->mem_rec_count = register_count;
> + while (register_count)
> + {
> + record_buf_mem[(register_count * 2) - 1] = start_address;
> + record_buf_mem[(register_count * 2) - 2] = 4;
> + start_address = start_address + 4;
> + register_count--;
> + }
> + break;
> +
> + /* Decrement before. */
> + case 2:
> +
> + start_address = (u_regval[0]) - (register_count * 4);
> + arm_insn_r->mem_rec_count = register_count;
> + while (register_count)
> + {
> + record_buf_mem[(register_count * 2) - 1] = start_address;
> + record_buf_mem[(register_count * 2) - 2] = 4;
> + start_address = start_address + 4;
> + register_count--;
> + }
> + break;
> +
> + /* Increment before. */
> + case 3:
> + start_address = u_regval[0] + 4;
> + arm_insn_r->mem_rec_count = register_count;
> + while (register_count)
> + {
> + record_buf_mem[(register_count * 2) - 1] = start_address;
> + record_buf_mem[(register_count * 2) - 2] = 4;
> + start_address = start_address + 4;
> + register_count--;
> + }
> + break;
> +
> + default:
> + gdb_assert_not_reached ("no decoding pattern found");
> + break;
> + }
> +
> + /* Base register also changes; based on condition and W bit. */
> + /* We save it anyway without optimization. */
> + record_buf[0] = reg_src1;
> + arm_insn_r->reg_rec_count = 1;
> + }
> +
> + REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
> + MEM_ALLOC (arm_insn_r->arm_mems, arm_insn_r->mem_rec_count,
> record_buf_mem);
> + return 0;
> +}
> +
> +/* Handling opcode 101 insns. */
> +
> +static int
> +arm_record_b_bl (insn_decode_record *arm_insn_r)
> +{
> + uint32_t record_buf[8];
> +
> + /* Handle B, BL, BLX(1) insns. */
> + /* B simply branches so we do nothing here. */
> + /* Note: BLX(1) doesnt fall here but instead it falls into
> + extension space. */
> + if (bit (arm_insn_r->arm_insn, 24))
> + {
> + record_buf[0] = ARM_LR_REGNUM;
> + arm_insn_r->reg_rec_count = 1;
> + }
> +
> + REG_ALLOC (arm_insn_r->arm_regs, arm_insn_r->reg_rec_count, record_buf);
> +
> + return 0;
> +}
> +
> +/* Handling opcode 110 insns. */
> +
> +static int
> +arm_record_coproc (insn_decode_record *arm_insn_r)
> +{
> + printf_unfiltered (_("Process record does not support instruction "
> + "0x%0x at address %s.\n"),arm_insn_r->arm_insn,
> + paddress (arm_insn_r->gdbarch,
> arm_insn_r->this_addr));
> +
> + return -1;
> +}
> +
> +/* Handling opcode 111 insns. */
> +
> +static int
> +arm_record_coproc_data_proc (insn_decode_record *arm_insn_r)
> +{
> + struct gdbarch_tdep *tdep = gdbarch_tdep (arm_insn_r->gdbarch);
> + struct regcache *reg_cache = arm_insn_r->regcache;
> + uint32_t ret = 0; /* function return value: -1:record failure ;
> 0:success */
> +
> + /* Handle SWI insn; system call would be handled over here. */
> +
> + arm_insn_r->opcode = bits (arm_insn_r->arm_insn, 24, 27);
> + if (15 == arm_insn_r->opcode)
> + {
> + /* Handle arm syscall insn. */
> + if (tdep->arm_swi_record != NULL)
> + {
> + ret = tdep->arm_swi_record(reg_cache);
> + }
> + else
> + {
> + printf_unfiltered (_("no syscall record support\n"));
> + ret = -1;
> + }
> + }
> +
> + printf_unfiltered (_("Process record does not support instruction "
> + "0x%0x at address %s.\n"),arm_insn_r->arm_insn,
> + paddress (arm_insn_r->gdbarch,
> arm_insn_r->this_addr));
> + return ret;
> +}
> +
> +/* Handling opcode 000 insns. */
> +
> +static int
> +thumb_record_shift_add_sub (insn_decode_record *thumb_insn_r)
> +{
> + uint32_t record_buf[8];
> + uint32_t reg_src1 = 0;
> +
> + reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
> +
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = reg_src1;
> + thumb_insn_r->reg_rec_count = 2;
> +
> + REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count,
> record_buf);
> +
> + return 0;
> +}
> +
> +
> +/* Handling opcode 001 insns. */
> +
> +static int
> +thumb_record_add_sub_cmp_mov (insn_decode_record *thumb_insn_r)
> +{
> + uint32_t record_buf[8];
> + uint32_t reg_src1 = 0;
> +
> + reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
> +
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = reg_src1;
> + thumb_insn_r->reg_rec_count = 2;
> +
> + REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count,
> record_buf);
> +
> + return 0;
> +}
> +
> +/* Handling opcode 010 insns. */
> +
> +static int
> +thumb_record_ld_st_reg_offset (insn_decode_record *thumb_insn_r)
> +{
> + struct regcache *reg_cache = thumb_insn_r->regcache;
> + uint32_t record_buf[8], record_buf_mem[8];
> +
> + uint32_t reg_src1 = 0, reg_src2 = 0;
> + uint32_t opcode1 = 0, opcode2 = 0, opcode3 = 0;
> +
> + ULONGEST u_regval[2] = {0};
> +
> + opcode1 = bits (thumb_insn_r->arm_insn, 10, 12);
> +
> + if (bit (thumb_insn_r->arm_insn, 12))
> + {
> + /* Handle load/store register offset. */
> + opcode2 = bits (thumb_insn_r->arm_insn, 9, 10);
> + if (opcode2 >= 12 && opcode2 <= 15)
> + {
> + /* LDR(2), LDRB(2) , LDRH(2), LDRSB, LDRSH. */
> + reg_src1 = bits (thumb_insn_r->arm_insn,0, 2);
> + record_buf[0] = reg_src1;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else if (opcode2 >= 8 && opcode2 <= 10)
> + {
> + /* STR(2), STRB(2), STRH(2) . */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5);
> + reg_src2 = bits (thumb_insn_r->arm_insn, 6, 8);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval[0]);
> + regcache_raw_read_unsigned (reg_cache, reg_src2, &u_regval[1]);
> + if (8 == opcode2)
> + record_buf_mem[0] = 4; /* STR (2). */
> + else if (10 == opcode2)
> + record_buf_mem[0] = 1; /* STRB (2). */
> + else if (9 == opcode2)
> + record_buf_mem[0] = 2; /* STRH (2). */
> + record_buf_mem[1] = u_regval[0] + u_regval[1];
> + thumb_insn_r->mem_rec_count = 1;
> + }
> + }
> + else if (bit (thumb_insn_r->arm_insn, 11))
> + {
> + /* Handle load from literal pool. */
> + /* LDR(3). */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
> + record_buf[0] = reg_src1;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else if (opcode1)
> + {
> + opcode2 = bits (thumb_insn_r->arm_insn, 8, 9);
> + opcode3 = bits (thumb_insn_r->arm_insn, 0, 2);
> + if ((3 == opcode2) && (!opcode3))
> + {
> + /* Branch with exchange. */
> + record_buf[0] = ARM_PS_REGNUM;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else
> + {
> + /* Format 8; special data processing insns. */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = reg_src1;
> + thumb_insn_r->reg_rec_count = 2;
> + }
> + }
> + else
> + {
> + /* Format 5; data processing insns. */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
> + if (bit (thumb_insn_r->arm_insn, 7))
> + {
> + reg_src1 = reg_src1 + 8;
> + }
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = reg_src1;
> + thumb_insn_r->reg_rec_count = 2;
> + }
> +
> + REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count,
> record_buf);
> + MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
> + record_buf_mem);
> +
> + return 0;
> +}
> +
> +/* Handling opcode 001 insns. */
> +
> +static int
> +thumb_record_ld_st_imm_offset (insn_decode_record *thumb_insn_r)
> +{
> + struct regcache *reg_cache = thumb_insn_r->regcache;
> + uint32_t record_buf[8], record_buf_mem[8];
> +
> + uint32_t reg_src1 = 0;
> + uint32_t opcode = 0, immed_5 = 0;
> +
> + ULONGEST u_regval = 0;
> +
> + opcode = bits (thumb_insn_r->arm_insn, 11, 12);
> +
> + if (opcode)
> + {
> + /* LDR(1). */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
> + record_buf[0] = reg_src1;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else
> + {
> + /* STR(1). */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5);
> + immed_5 = bits (thumb_insn_r->arm_insn, 6, 10);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
> + record_buf_mem[0] = 4;
> + record_buf_mem[1] = u_regval + (immed_5 * 4);
> + thumb_insn_r->mem_rec_count = 1;
> + }
> +
> + REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count,
> record_buf);
> + MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
> + record_buf_mem);
> +
> + return 0;
> +}
> +
> +/* Handling opcode 100 insns. */
> +
> +static int
> +thumb_record_ld_st_stack (insn_decode_record *thumb_insn_r)
> +{
> + struct regcache *reg_cache = thumb_insn_r->regcache;
> + uint32_t record_buf[8], record_buf_mem[8];
> +
> + uint32_t reg_src1 = 0;
> + uint32_t opcode = 0, immed_8 = 0, immed_5 = 0;
> +
> + ULONGEST u_regval = 0;
> +
> + opcode = bits (thumb_insn_r->arm_insn, 11, 12);
> +
> + if (3 == opcode)
> + {
> + /* LDR(4). */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
> + record_buf[0] = reg_src1;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else if (1 == opcode)
> + {
> + /* LDRH(1). */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 0, 2);
> + record_buf[0] = reg_src1;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else if (2 == opcode)
> + {
> + /* STR(3). */
> + immed_8 = bits (thumb_insn_r->arm_insn, 0, 7);
> + regcache_raw_read_unsigned (reg_cache, ARM_SP_REGNUM, &u_regval);
> + record_buf_mem[0] = 4;
> + record_buf_mem[1] = u_regval + (immed_8 * 4);
> + thumb_insn_r->mem_rec_count = 1;
> + }
> + else if (0 == opcode)
> + {
> + /* STRH(1). */
> + immed_5 = bits (thumb_insn_r->arm_insn, 6, 10);
> + reg_src1 = bits (thumb_insn_r->arm_insn, 3, 5);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
> + record_buf_mem[0] = 2;
> + record_buf_mem[1] = u_regval + (immed_5 * 2);
> + thumb_insn_r->mem_rec_count = 1;
> + }
> +
> + REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count,
> record_buf);
> + MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
> + record_buf_mem);
> +
> + return 0;
> +}
> +
> +/* Handling opcode 101 insns. */
> +
> +static int
> +thumb_record_misc (insn_decode_record *thumb_insn_r)
> +{
> + struct regcache *reg_cache = thumb_insn_r->regcache;
> +
> + uint32_t opcode = 0, opcode1 = 0, opcode2 = 0;
> + uint32_t register_bits = 0, register_count = 0;
> + uint32_t register_list[8] = {0}, index = 0, start_address = 0;
> + uint32_t record_buf[24], record_buf_mem[48];
> + uint32_t reg_src1;
> +
> + ULONGEST u_regval = 0;
> +
> + opcode = bits (thumb_insn_r->arm_insn, 11, 12);
> + opcode1 = bits (thumb_insn_r->arm_insn, 8, 12);
> + opcode2 = bits (thumb_insn_r->arm_insn, 9, 12);
> +
> + if (14 == opcode2)
> + {
> + /* POP. */
> + register_bits = bits (thumb_insn_r->arm_insn, 0, 7);
> + while (register_bits)
> + {
> + if (register_bits & 0x00000001)
> + register_list[register_count++] = 1;
> + register_bits = register_bits >> 1;
> + }
> + record_buf[register_count] = ARM_PS_REGNUM;
> + record_buf[register_count + 1] = ARM_SP_REGNUM;
> + thumb_insn_r->reg_rec_count = register_count + 2;
> + for (register_count = 0; register_count < 8; register_count++)
> + {
> + if (register_list[register_count])
> + {
> + record_buf[index] = register_count;
> + index++;
> + }
> + }
> + }
> + else if (10 == opcode2)
> + {
> + /* PUSH. */
> + register_bits = bits (thumb_insn_r->arm_insn, 0, 7);
> + regcache_raw_read_unsigned (reg_cache, ARM_PC_REGNUM, &u_regval);
> + while (register_bits)
> + {
> + if (register_bits & 0x00000001)
> + register_count++;
> + register_bits = register_bits >> 1;
> + }
> + start_address = u_regval - \
> + (4 * (bit (thumb_insn_r->arm_insn, 8) +
> register_count));
> + thumb_insn_r->mem_rec_count = register_count;
> + while (register_count)
> + {
> + record_buf_mem[(register_count * 2) - 1] = start_address;
> + record_buf_mem[(register_count * 2) - 2] = 4;
> + start_address = start_address + 4;
> + register_count--;
> + }
> + record_buf[0] = ARM_SP_REGNUM;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else if (0x1E == opcode1)
> + {
> + /* BKPT insn. */
> + /* Handle enhanced software breakpoint insn, BKPT. */
> + /* CPSR is changed to be executed in ARM state, disabling normal
> + interrupts, entering abort mode. */
> + /* According to high vector configuration PC is set. */
> + /* User hits breakpoint and type reverse, in that case, we need
> to go back with
> + previous CPSR and Program Counter. */
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = ARM_LR_REGNUM;
> + thumb_insn_r->reg_rec_count = 2;
> + /* We need to save SPSR value, which is not yet done. */
> + printf_unfiltered (_("Process record does not support instruction "
> + "0x%0x at address %s.\n"),
> + thumb_insn_r->arm_insn,
> + paddress (thumb_insn_r->gdbarch,
> + thumb_insn_r->this_addr));
> + return -1;
> + }
> + else if ((0 == opcode) || (1 == opcode))
> + {
> + /* ADD(5), ADD(6). */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
> + record_buf[0] = reg_src1;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else if (2 == opcode)
> + {
> + /* ADD(7), SUB(4). */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
> + record_buf[0] = ARM_SP_REGNUM;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> +
> + REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count,
> record_buf);
> + MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
> + record_buf_mem);
> +
> + return 0;
> +}
> +
> +/* Handling opcode 110 insns. */
> +
> +static int
> +thumb_record_ldm_stm_swi (insn_decode_record *thumb_insn_r)
> +{
> + struct gdbarch_tdep *tdep = gdbarch_tdep (thumb_insn_r->gdbarch);
> + struct regcache *reg_cache = thumb_insn_r->regcache;
> +
> + uint32_t ret = 0; /* function return value: -1:record failure ;
> 0:success */
> + uint32_t reg_src1 = 0;
> + uint32_t opcode1 = 0, opcode2 = 0, register_bits = 0, register_count =
> 0;
> + uint32_t register_list[8] = {0}, index = 0, start_address = 0;
> + uint32_t record_buf[24], record_buf_mem[48];
> +
> + ULONGEST u_regval = 0;
> +
> + opcode1 = bits (thumb_insn_r->arm_insn, 8, 12);
> + opcode2 = bits (thumb_insn_r->arm_insn, 11, 12);
> +
> + if (1 == opcode2)
> + {
> +
> + /* LDMIA. */
> + register_bits = bits (thumb_insn_r->arm_insn, 0, 7);
> + /* Get Rn. */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
> + while (register_bits)
> + {
> + if (register_bits & 0x00000001)
> + register_list[register_count++] = 1;
> + register_bits = register_bits >> 1;
> + }
> + record_buf[register_count] = reg_src1;
> + thumb_insn_r->reg_rec_count = register_count + 1;
> + for (register_count = 0; register_count < 8; register_count++)
> + {
> + if (register_list[register_count])
> + {
> + record_buf[index] = register_count;
> + index++;
> + }
> + }
> + }
> + else if (0 == opcode2)
> + {
> + /* It handles both STMIA. */
> + register_bits = bits (thumb_insn_r->arm_insn, 0, 7);
> + /* Get Rn. */
> + reg_src1 = bits (thumb_insn_r->arm_insn, 8, 10);
> + regcache_raw_read_unsigned (reg_cache, reg_src1, &u_regval);
> + while (register_bits)
> + {
> + if (register_bits & 0x00000001)
> + register_count++;
> + register_bits = register_bits >> 1;
> + }
> + start_address = u_regval;
> + thumb_insn_r->mem_rec_count = register_count;
> + while (register_count)
> + {
> + record_buf_mem[(register_count * 2) - 1] = start_address;
> + record_buf_mem[(register_count * 2) - 2] = 4;
> + start_address = start_address + 4;
> + register_count--;
> + }
> + }
> + else if (0x1F == opcode1)
> + {
> + /* Handle arm syscall insn. */
> + if (tdep->arm_swi_record != NULL)
> + {
> + ret = tdep->arm_swi_record(reg_cache);
> + }
> + else
> + {
> + printf_unfiltered (_("no syscall record support\n"));
> + return -1;
> + }
> + }
> +
> + /* B (1), conditional branch is automatically taken care in
> process_record,
> + as PC is saved there. */
> +
> + REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count,
> record_buf);
> + MEM_ALLOC (thumb_insn_r->arm_mems, thumb_insn_r->mem_rec_count,
> + record_buf_mem);
> +
> + return ret;
> +}
> +
> +/* Handling opcode 111 insns. */
> +
> +static int
> +thumb_record_branch (insn_decode_record *thumb_insn_r)
> +{
> + uint32_t record_buf[8];
> + uint32_t bits_h = 0;
> +
> + bits_h = bits (thumb_insn_r->arm_insn, 11, 12);
> +
> + if (2 == bits_h || 3 == bits_h)
> + {
> + /* BL */
> + record_buf[0] = ARM_LR_REGNUM;
> + thumb_insn_r->reg_rec_count = 1;
> + }
> + else if (1 == bits_h)
> + {
> + /* BLX(1). */
> + record_buf[0] = ARM_PS_REGNUM;
> + record_buf[1] = ARM_LR_REGNUM;
> + thumb_insn_r->reg_rec_count = 2;
> + }
> +
> + /* B(2) is automatically taken care in process_record, as PC is
> + saved there. */
> +
> + REG_ALLOC (thumb_insn_r->arm_regs, thumb_insn_r->reg_rec_count,
> record_buf);
> +
> + return 0;
> +}
> +
> +
> +/* Extracts arm/thumb/thumb2 insn depending on the size, and returns
> 0 on success
> +and positive val on fauilure. */
> +
> +static int
> +extract_arm_insn (insn_decode_record *insn_record, uint32_t insn_size)
> +{
> + gdb_byte buf[insn_size];
> +
> + memset (&buf[0], 0, insn_size);
> +
> + if (target_read_memory (insn_record->this_addr, &buf[0], insn_size))
> + return 1;
> + insn_record->arm_insn = (uint32_t) extract_unsigned_integer (&buf[0],
> + insn_size,
> + gdbarch_byte_order (insn_record->gdbarch));
> + return 0;
> +}
> +
> +typedef int (*sti_arm_hdl_fp_t) (insn_decode_record*);
> +
> +/* Decode arm/thumb insn depending on condition cods and opcodes; and
> + dispatch it. */
> +
> +static int
> +decode_insn (insn_decode_record *arm_record, record_type_t record_type,
> + uint32_t insn_size)
> +{
> +
> + /* (Starting from numerical 0); bits 25, 26, 27 decodes type of arm
> instruction. */
> + static const sti_arm_hdl_fp_t const arm_handle_insn[8] =
> + {
> + arm_record_data_proc_misc_ld_str, /* 000. */
> + arm_record_data_proc_imm, /* 001. */
> + arm_record_ld_st_imm_offset, /* 010. */
> + arm_record_ld_st_reg_offset, /* 011. */
> + arm_record_ld_st_multiple, /* 100. */
> + arm_record_b_bl, /* 101. */
> + arm_record_coproc, /* 110. */
> + arm_record_coproc_data_proc /* 111. */
> + };
> +
> + /* (Starting from numerical 0); bits 13,14,15 decodes type of thumb
> instruction. */
> + static const sti_arm_hdl_fp_t const thumb_handle_insn[8] =
> + { \
> + thumb_record_shift_add_sub, /* 000. */
> + thumb_record_add_sub_cmp_mov, /* 001. */
> + thumb_record_ld_st_reg_offset, /* 010. */
> + thumb_record_ld_st_imm_offset, /* 011. */
> + thumb_record_ld_st_stack, /* 100. */
> + thumb_record_misc, /* 101. */
> + thumb_record_ldm_stm_swi, /* 110. */
> + thumb_record_branch /* 111. */
> + };
> +
> + uint32_t ret = 0; /* return value: negative:failure 0:success. */
> + uint32_t insn_id = 0;
> +
> + if (extract_arm_insn (arm_record, insn_size))
> + {
> + if (record_debug)
> + {
> + printf_unfiltered (_("Process record: error reading memory at "
> + "addr %s len = %d.\n"),
> + paddress (arm_record->gdbarch, arm_record->this_addr),
> insn_size);
> + }
> + return -1;
> + }
> + else if (ARM_RECORD == record_type)
> + {
> + arm_record->cond = bits (arm_record->arm_insn, 28, 31);
> + insn_id = bits (arm_record->arm_insn, 25, 27);
> + ret = arm_record_extension_space (arm_record);
> + /* If this insn has fallen into extension space
> + then we need not decode it anymore. */
> + if (ret != -1 && !INSN_RECORDED(arm_record))
> + {
> + ret = arm_handle_insn[insn_id] (arm_record);
> + }
> + }
> + else if (THUMB_RECORD == record_type)
> + {
> + /* As thumb does not have condition codes, we set negative. */
> + arm_record->cond = -1;
> + insn_id = bits (arm_record->arm_insn, 13, 15);
> + ret = thumb_handle_insn[insn_id] (arm_record);
> + }
> + else if (THUMB2_RECORD == record_type)
> + {
> + printf_unfiltered (_("Process record doesnt support thumb32
> instruction "
> + "0x%0x at address %s.\n"),arm_record->arm_insn,
> + paddress (arm_record->gdbarch,
> + arm_record->this_addr));
> + ret = -1;
> + }
> + else
> + {
> + /* Throw assertion. */
> + gdb_assert_not_reached ("not a valid instruction, could not
> decode");
> + }
> +
> + return ret;
> +}
> +
> +
> +/* Cleans up local record registers and memory allocations. */
> +
> +static void
> +deallocate_reg_mem (insn_decode_record *record)
> +{
> + xfree (record->arm_regs);
> + xfree (record->arm_mems);
> +}
> +
> +
> +/* Parse the current instruction and record the values of the registers
> and
> + memory that will be changed in current instruction to
> record_arch_list".
> + Return -1 if something is wrong. */
> +
> +int
> +arm_process_record (struct gdbarch *gdbarch, struct regcache *regcache,
> + CORE_ADDR insn_addr)
> +{
> +
> + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
> + uint32_t no_of_rec = 0;
> + uint32_t ret = 0; /* return value: -1:record failure ; 0:success */
> + ULONGEST t_bit = 0, insn_id = 0;
> +
> + ULONGEST u_regval = 0;
> +
> + insn_decode_record arm_record;
> +
> + memset (&arm_record, 0, sizeof (insn_decode_record));
> + arm_record.regcache = regcache;
> + arm_record.this_addr = insn_addr;
> + arm_record.gdbarch = gdbarch;
> +
> +
> + if (record_debug > 1)
> + {
> + fprintf_unfiltered (gdb_stdlog, "Process record: arm_process_record
> "
> + "addr = %s\n",
> + paddress (gdbarch, arm_record.this_addr));
> + }
> +
> + if (extract_arm_insn (&arm_record, 2))
> + {
> + if (record_debug)
> + {
> + printf_unfiltered (_("Process record: error reading memory at "
> + "addr %s len = %d.\n"),
> + paddress (arm_record.gdbarch,
> + arm_record.this_addr), 2);
> + }
> + return -1;
> + }
> +
> + /* Check the insn, whether it is thumb or arm one. */
> +
> + t_bit = arm_psr_thumb_bit (arm_record.gdbarch);
> + regcache_raw_read_unsigned (arm_record.regcache, ARM_PS_REGNUM,
> &u_regval);
> +
> +
> + if (!(u_regval & t_bit))
> + {
> + /* We are decoding arm insn. */
> + ret = decode_insn (&arm_record, ARM_RECORD, ARM_INSN_SIZE_BYTES);
> + }
> + else
> + {
> + insn_id = bits (arm_record.arm_insn, 11, 15);
> + /* is it thumb2 insn? */
> + if ((0x1D == insn_id) || (0x1E == insn_id) || (0x1F == insn_id))
> + {
> + ret = decode_insn (&arm_record, THUMB2_RECORD,
> + THUMB2_INSN_SIZE_BYTES);
> + }
> + else
> + {
> + /* We are decoding thumb insn. */
> + ret = decode_insn (&arm_record, THUMB_RECORD,
> THUMB_INSN_SIZE_BYTES);
> + }
> + }
> +
> + if (0 == ret)
> + {
> + /* Record registers. */
> + record_arch_list_add_reg (arm_record.regcache, ARM_PC_REGNUM);
> + if (arm_record.arm_regs)
> + {
> + for (no_of_rec = 0; no_of_rec < arm_record.reg_rec_count;
> no_of_rec++)
> + {
> + if (record_arch_list_add_reg (arm_record.regcache ,
> +
> arm_record.arm_regs[no_of_rec]))
> + ret = -1;
> + }
> + }
> + /* Record memories. */
> + if (arm_record.arm_mems)
> + {
> + for (no_of_rec = 0; no_of_rec < arm_record.mem_rec_count;
> no_of_rec++)
> + {
> + if (record_arch_list_add_mem
> + ((CORE_ADDR)arm_record.arm_mems[no_of_rec].addr,
> + arm_record.arm_mems[no_of_rec].len))
> + ret = -1;
> + }
> + }
> +
> + if (record_arch_list_add_end ())
> + ret = -1;
> + }
> +
> +
> + deallocate_reg_mem (&arm_record);
> +
> + return ret;
> +}
> +
> +
> diff -urN arm_orig/arm-tdep.h arm_new/arm-tdep.h
> --- arm_orig/arm-tdep.h 2011-12-03 18:06:39.000000000 +0530
> +++ arm_new/arm-tdep.h 2011-12-03 17:52:28.000000000 +0530
> @@ -201,6 +201,9 @@
> /* Return the expected next PC if FRAME is stopped at a syscall
> instruction. */
> CORE_ADDR (*syscall_next_pc) (struct frame_info *frame);
> +
> + /* Parse swi insn args, sycall record. */
> + int (*arm_swi_record) (struct regcache *regcache);
> };
>
> /* Structures used for displaced stepping. */
> @@ -330,6 +333,8 @@
> instruction? */
> extern int arm_pc_is_thumb (struct gdbarch *, CORE_ADDR);
>
> +extern int arm_process_record (struct gdbarch *gdbarch,
> + struct regcache *regcache, CORE_ADDR addr);
> /* Functions exported from armbsd-tdep.h. */
>
> /* Return the appropriate register set for the core section identified
>