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[patch/rfc] Convert d10v to new frame mechanism
- From: Andrew Cagney <ac131313 at redhat dot com>
- To: gdb-patches at sources dot redhat dot com
- Date: Tue, 28 Jan 2003 17:01:48 -0500
- Subject: [patch/rfc] Convert d10v to new frame mechanism
Hello,
The attached rewrites the d10v code so that it uses the new frame unwind
mechanims.
I'll commit it in a few days.
Andrew
2003-01-28 Andrew Cagney <ac131313@redhat.com>
* d10v-tdep.c: Include "frame-unwind.h".
(d10v_gdbarch_init): Append d10v_frame_p to the unwind predicate
list.
(next_addr, uses_frame): Delete.
(struct d10v_unwind_cache): Define.
(prologue_find_regs): Add struct d10v_unwind_cache info parameter.
Use info instead of next_addr and uses_frame globals.
(d10v_frame_init_saved_regs): Delete function.
(d10v_init_extra_frame_info): Delete function.
(d10v_gdbarch_init): Do not initialize init_extra_frame_info,
frame_init_saved_regs or pop_frame, frame_chain, frame_chain_valid,
init_frame_pc or frame_saved_pc.
(d10v_pop_frame): Delete function.
(do_d10v_pop_frame): Delete function.
(d10v_frame_chain): Delete function.
(d10v_frame_chain_valid): Delete function.
(d10v_frame_pc_unwind): New function.
(d10v_frame_id_unwind): New function.
(saved_regs_unwinder): New function.
(d10v_frame_register_unwind): New function.
(d10v_frame_pop): New function.
(d10v_frame_unwind): New variable.
(d10v_frame_p): New function.
(d10v_frame_saved_pc): Delete function.
* Makefile.in (d10v-tdep.o): Update dependencies.
Index: Makefile.in
===================================================================
RCS file: /cvs/src/src/gdb/Makefile.in,v
retrieving revision 1.319
diff -u -r1.319 Makefile.in
--- Makefile.in 27 Jan 2003 21:41:39 -0000 1.319
+++ Makefile.in 28 Jan 2003 21:59:59 -0000
@@ -1621,9 +1621,9 @@
$(solib_h) $(solib_svr4_h) $(gdb_string_h)
d10v-tdep.o: d10v-tdep.c $(defs_h) $(frame_h) $(symtab_h) $(gdbtypes_h) \
$(gdbcmd_h) $(gdbcore_h) $(gdb_string_h) $(value_h) $(inferior_h) \
- $(dis_asm_h) $(symfile_h) $(objfiles_h) $(language_h) \
- $(arch_utils_h) $(regcache_h) $(floatformat_h) $(gdb_sim_d10v_h) \
- $(sim_regno_h)
+ $(dis_asm_h) $(symfile_h) $(objfiles_h) $(language_h) $(arch_utils_h) \
+ $(regcache_h) $(floatformat_h) $(gdb_sim_d10v_h) $(sim_regno_h) \
+ $(gdb_assert_h)
dbug-rom.o: dbug-rom.c $(defs_h) $(gdbcore_h) $(target_h) $(monitor_h) \
$(serial_h) $(regcache_h) $(m68k_tdep_h)
dbxread.o: dbxread.c $(defs_h) $(gdb_string_h) $(gdb_obstack_h) \
Index: d10v-tdep.c
===================================================================
RCS file: /cvs/src/src/gdb/d10v-tdep.c,v
retrieving revision 1.72
diff -u -r1.72 d10v-tdep.c
--- d10v-tdep.c 19 Jan 2003 22:24:50 -0000 1.72
+++ d10v-tdep.c 28 Jan 2003 22:00:00 -0000
@@ -24,6 +24,7 @@
#include "defs.h"
#include "frame.h"
+#include "frame-unwind.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "gdbcmd.h"
@@ -104,19 +105,6 @@
static void d10v_eva_get_trace_data (void);
-static int prologue_find_regs (unsigned short op, struct frame_info *fi,
- CORE_ADDR addr);
-
-static void d10v_frame_init_saved_regs (struct frame_info *);
-
-static void do_d10v_pop_frame (struct frame_info *fi);
-
-static int
-d10v_frame_chain_valid (CORE_ADDR chain, struct frame_info *frame)
-{
- return (get_frame_pc (frame) > IMEM_START);
-}
-
static CORE_ADDR
d10v_stack_align (CORE_ADDR len)
{
@@ -518,17 +506,6 @@
return (addr | DMEM_START);
}
-static CORE_ADDR
-d10v_frame_saved_pc (struct frame_info *frame)
-{
- if (DEPRECATED_PC_IN_CALL_DUMMY (frame->pc, 0, 0))
- return d10v_make_iaddr (deprecated_read_register_dummy (frame->pc,
- frame->frame,
- PC_REGNUM));
- else
- return ((frame)->extra_info->return_pc);
-}
-
/* Immediately after a function call, return the saved pc. We can't
use frame->return_pc beause that is determined by reading R13 off
the stack and that may not be written yet. */
@@ -540,55 +517,6 @@
| IMEM_START);
}
-/* Discard from the stack the innermost frame, restoring all saved
- registers. */
-
-static void
-d10v_pop_frame (void)
-{
- generic_pop_current_frame (do_d10v_pop_frame);
-}
-
-static void
-do_d10v_pop_frame (struct frame_info *fi)
-{
- CORE_ADDR fp;
- int regnum;
- char raw_buffer[8];
-
- fp = get_frame_base (fi);
- /* fill out fsr with the address of where each */
- /* register was stored in the frame */
- d10v_frame_init_saved_regs (fi);
-
- /* now update the current registers with the old values */
- for (regnum = A0_REGNUM; regnum < A0_REGNUM + NR_A_REGS; regnum++)
- {
- if (get_frame_saved_regs (fi)[regnum])
- {
- read_memory (get_frame_saved_regs (fi)[regnum], raw_buffer, REGISTER_RAW_SIZE (regnum));
- deprecated_write_register_bytes (REGISTER_BYTE (regnum), raw_buffer,
- REGISTER_RAW_SIZE (regnum));
- }
- }
- for (regnum = 0; regnum < SP_REGNUM; regnum++)
- {
- if (get_frame_saved_regs (fi)[regnum])
- {
- write_register (regnum, read_memory_unsigned_integer (get_frame_saved_regs (fi)[regnum], REGISTER_RAW_SIZE (regnum)));
- }
- }
- if (get_frame_saved_regs (fi)[PSW_REGNUM])
- {
- write_register (PSW_REGNUM, read_memory_unsigned_integer (get_frame_saved_regs (fi)[PSW_REGNUM], REGISTER_RAW_SIZE (PSW_REGNUM)));
- }
-
- write_register (PC_REGNUM, read_register (LR_REGNUM));
- write_register (SP_REGNUM, fp + get_frame_extra_info (fi)->size);
- target_store_registers (-1);
- flush_cached_frames ();
-}
-
static int
check_prologue (unsigned short op)
{
@@ -686,51 +614,20 @@
return pc;
}
-/* Given a GDB frame, determine the address of the calling function's
- frame. This will be used to create a new GDB frame struct, and
- then INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC will be
- called for the new frame. */
-
-static CORE_ADDR
-d10v_frame_chain (struct frame_info *fi)
+struct d10v_unwind_cache
{
- CORE_ADDR addr;
-
- /* A generic call dummy's frame is the same as caller's. */
- if (DEPRECATED_PC_IN_CALL_DUMMY (fi->pc, 0, 0))
- return fi->frame;
-
- d10v_frame_init_saved_regs (fi);
-
- if (get_frame_extra_info (fi)->return_pc == IMEM_START
- || inside_entry_file (get_frame_extra_info (fi)->return_pc))
- {
- /* This is meant to halt the backtrace at "_start".
- Make sure we don't halt it at a generic dummy frame. */
- return (CORE_ADDR) 0;
- }
-
- if (!get_frame_saved_regs (fi)[FP_REGNUM])
- {
- if (!get_frame_saved_regs (fi)[SP_REGNUM]
- || get_frame_saved_regs (fi)[SP_REGNUM] == STACK_START)
- return (CORE_ADDR) 0;
-
- return get_frame_saved_regs (fi)[SP_REGNUM];
- }
-
- addr = read_memory_unsigned_integer (get_frame_saved_regs (fi)[FP_REGNUM],
- REGISTER_RAW_SIZE (FP_REGNUM));
- if (addr == 0)
- return (CORE_ADDR) 0;
-
- return d10v_make_daddr (addr);
-}
-
-static int next_addr, uses_frame;
+ CORE_ADDR return_pc;
+ int frameless;
+ int size;
+ CORE_ADDR *saved_regs;
+ CORE_ADDR next_addr;
+ int uses_frame;
+ void **regs;
+};
static int
-prologue_find_regs (unsigned short op, struct frame_info *fi, CORE_ADDR addr)
+prologue_find_regs (struct d10v_unwind_cache *info, unsigned short op,
+ CORE_ADDR addr)
{
int n;
@@ -738,8 +635,8 @@
if ((op & 0x7E1F) == 0x6C1F)
{
n = (op & 0x1E0) >> 5;
- next_addr -= 2;
- get_frame_saved_regs (fi)[n] = next_addr;
+ info->next_addr -= 2;
+ info->saved_regs[n] = info->next_addr;
return 1;
}
@@ -747,9 +644,9 @@
else if ((op & 0x7E3F) == 0x6E1F)
{
n = (op & 0x1E0) >> 5;
- next_addr -= 4;
- get_frame_saved_regs (fi)[n] = next_addr;
- get_frame_saved_regs (fi)[n + 1] = next_addr + 2;
+ info->next_addr -= 4;
+ info->saved_regs[n] = info->next_addr;
+ info->saved_regs[n + 1] = info->next_addr + 2;
return 1;
}
@@ -759,14 +656,14 @@
n = (op & 0x1E) >> 1;
if (n == 0)
n = 16;
- next_addr -= n;
+ info->next_addr -= n;
return 1;
}
/* mv r11, sp */
if (op == 0x417E)
{
- uses_frame = 1;
+ info->uses_frame = 1;
return 1;
}
@@ -778,7 +675,7 @@
if ((op & 0x7E1F) == 0x681E)
{
n = (op & 0x1E0) >> 5;
- get_frame_saved_regs (fi)[n] = next_addr;
+ info->saved_regs[n] = info->next_addr;
return 1;
}
@@ -786,8 +683,8 @@
if ((op & 0x7E3F) == 0x3A1E)
{
n = (op & 0x1E0) >> 5;
- get_frame_saved_regs (fi)[n] = next_addr;
- get_frame_saved_regs (fi)[n + 1] = next_addr + 2;
+ info->saved_regs[n] = info->next_addr;
+ info->saved_regs[n + 1] = info->next_addr + 2;
return 1;
}
@@ -800,21 +697,33 @@
in the stack frame. sp is even more special: the address we return
for it IS the sp for the next frame. */
-static void
-d10v_frame_init_saved_regs (struct frame_info *fi)
+struct d10v_unwind_cache *
+d10v_frame_unwind_cache (struct frame_info *fi,
+ void **cache)
{
CORE_ADDR fp, pc;
unsigned long op;
unsigned short op1, op2;
int i;
+ struct d10v_unwind_cache *info;
+
+ if ((*cache))
+ return (*cache);
+
+ info = FRAME_OBSTACK_ZALLOC (struct d10v_unwind_cache);
+ (*cache) = info;
+ info->saved_regs = frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);
+
+ info->frameless = 0;
+ info->size = 0;
+ info->return_pc = 0;
fp = get_frame_base (fi);
- memset (get_frame_saved_regs (fi), 0, SIZEOF_FRAME_SAVED_REGS);
- next_addr = 0;
+ info->next_addr = 0;
pc = get_pc_function_start (get_frame_pc (fi));
- uses_frame = 0;
+ info->uses_frame = 0;
while (1)
{
op = (unsigned long) read_memory_integer (pc, 4);
@@ -825,22 +734,22 @@
{
/* add3 sp,sp,n */
short n = op & 0xFFFF;
- next_addr += n;
+ info->next_addr += n;
}
else if ((op & 0x3F0F0000) == 0x340F0000)
{
/* st rn, @(offset,sp) */
short offset = op & 0xFFFF;
short n = (op >> 20) & 0xF;
- get_frame_saved_regs (fi)[n] = next_addr + offset;
+ info->saved_regs[n] = info->next_addr + offset;
}
else if ((op & 0x3F1F0000) == 0x350F0000)
{
/* st2w rn, @(offset,sp) */
short offset = op & 0xFFFF;
short n = (op >> 20) & 0xF;
- get_frame_saved_regs (fi)[n] = next_addr + offset;
- get_frame_saved_regs (fi)[n + 1] = next_addr + offset + 2;
+ info->saved_regs[n] = info->next_addr + offset;
+ info->saved_regs[n + 1] = info->next_addr + offset + 2;
}
else
break;
@@ -858,73 +767,55 @@
op1 = (op & 0x3FFF8000) >> 15;
op2 = op & 0x7FFF;
}
- if (!prologue_find_regs (op1, fi, pc)
- || !prologue_find_regs (op2, fi, pc))
+ if (!prologue_find_regs (info, op1, pc)
+ || !prologue_find_regs (info, op2, pc))
break;
}
pc += 4;
}
- get_frame_extra_info (fi)->size = -next_addr;
+ info->size = -info->next_addr;
if (!(fp & 0xffff))
fp = d10v_read_sp ();
for (i = 0; i < NUM_REGS - 1; i++)
- if (get_frame_saved_regs (fi)[i])
+ if (info->saved_regs[i])
{
- get_frame_saved_regs (fi)[i] = fp - (next_addr - get_frame_saved_regs (fi)[i]);
+ info->saved_regs[i] = fp - (info->next_addr - info->saved_regs[i]);
}
- if (get_frame_saved_regs (fi)[LR_REGNUM])
+ if (info->saved_regs[LR_REGNUM])
{
CORE_ADDR return_pc
- = read_memory_unsigned_integer (get_frame_saved_regs (fi)[LR_REGNUM],
+ = read_memory_unsigned_integer (info->saved_regs[LR_REGNUM],
REGISTER_RAW_SIZE (LR_REGNUM));
- get_frame_extra_info (fi)->return_pc = d10v_make_iaddr (return_pc);
+ info->return_pc = d10v_make_iaddr (return_pc);
}
else
{
- get_frame_extra_info (fi)->return_pc = d10v_make_iaddr (read_register (LR_REGNUM));
+ ULONGEST return_pc;
+ frame_read_unsigned_register (fi, LR_REGNUM, &return_pc);
+ info->return_pc = d10v_make_iaddr (return_pc);
}
/* The SP is not normally (ever?) saved, but check anyway */
- if (!get_frame_saved_regs (fi)[SP_REGNUM])
+ if (!info->saved_regs[SP_REGNUM])
{
/* if the FP was saved, that means the current FP is valid, */
/* otherwise, it isn't being used, so we use the SP instead */
- if (uses_frame)
- get_frame_saved_regs (fi)[SP_REGNUM]
- = d10v_read_fp () + get_frame_extra_info (fi)->size;
+ if (info->uses_frame)
+ info->saved_regs[SP_REGNUM]
+ = d10v_read_fp () + info->size;
else
{
- get_frame_saved_regs (fi)[SP_REGNUM] = fp + get_frame_extra_info (fi)->size;
- get_frame_extra_info (fi)->frameless = 1;
- get_frame_saved_regs (fi)[FP_REGNUM] = 0;
+ info->saved_regs[SP_REGNUM] = fp + info->size;
+ info->frameless = 1;
+ info->saved_regs[FP_REGNUM] = 0;
}
}
-}
-static void
-d10v_init_extra_frame_info (int fromleaf, struct frame_info *fi)
-{
- frame_extra_info_zalloc (fi, sizeof (struct frame_extra_info));
- frame_saved_regs_zalloc (fi);
-
- get_frame_extra_info (fi)->frameless = 0;
- get_frame_extra_info (fi)->size = 0;
- get_frame_extra_info (fi)->return_pc = 0;
-
- /* If get_frame_pc (fi) is zero, but this is not the outermost frame,
- then let's snatch the return_pc from the callee, so that
- DEPRECATED_PC_IN_CALL_DUMMY will work. */
- if (get_frame_pc (fi) == 0
- && frame_relative_level (fi) != 0 && get_next_frame (fi) != NULL)
- deprecated_update_frame_pc_hack (fi, d10v_frame_saved_pc (get_next_frame (fi)));
-
- /* The call dummy doesn't save any registers on the stack, so we can
- return now. */
- d10v_frame_init_saved_regs (fi);
+ return info;
}
static void
@@ -1504,6 +1395,174 @@
}
+static CORE_ADDR
+d10v_frame_pc_unwind (struct frame_info *frame,
+ void **cache)
+{
+ struct d10v_unwind_cache *info = d10v_frame_unwind_cache (frame, cache);
+ return info->return_pc;
+}
+
+/* Given a GDB frame, determine the address of the calling function's
+ frame. This will be used to create a new GDB frame struct. */
+
+static void
+d10v_frame_id_unwind (struct frame_info *frame,
+ void **cache,
+ struct frame_id *id)
+{
+ struct d10v_unwind_cache *info = d10v_frame_unwind_cache (frame, cache);
+ CORE_ADDR addr;
+
+ /* Start with a NULL frame ID. */
+ (*id) = null_frame_id;
+
+ if (info->return_pc == IMEM_START
+ || info->return_pc <= IMEM_START
+ || inside_entry_file (info->return_pc))
+ {
+ /* This is meant to halt the backtrace at "_start".
+ Make sure we don't halt it at a generic dummy frame. */
+ return;
+ }
+
+ if (!info->saved_regs[FP_REGNUM])
+ {
+ if (!info->saved_regs[SP_REGNUM]
+ || info->saved_regs[SP_REGNUM] == STACK_START)
+ return;
+
+ id->base = info->saved_regs[SP_REGNUM];
+ id->pc = info->return_pc;
+ }
+
+ addr = read_memory_unsigned_integer (info->saved_regs[FP_REGNUM],
+ REGISTER_RAW_SIZE (FP_REGNUM));
+ if (addr == 0)
+ return;
+
+ id->base = d10v_make_daddr (addr);
+ id->pc = info->return_pc;
+}
+
+static void
+saved_regs_unwinder (struct frame_info *frame,
+ CORE_ADDR *saved_regs,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *bufferp)
+{
+ /* If we're using generic dummy frames, we'd better not be in a call
+ dummy. (generic_call_dummy_register_unwind ought to have been called
+ instead.) */
+ gdb_assert (!(DEPRECATED_USE_GENERIC_DUMMY_FRAMES
+ && (get_frame_type (frame) == DUMMY_FRAME)));
+
+ if (saved_regs[regnum] != 0)
+ {
+ if (regnum == SP_REGNUM)
+ {
+ /* SP register treated specially. */
+ *optimizedp = 0;
+ *lvalp = not_lval;
+ *addrp = 0;
+ *realnump = -1;
+ if (bufferp != NULL)
+ store_address (bufferp, REGISTER_RAW_SIZE (regnum),
+ saved_regs[regnum]);
+ }
+ else
+ {
+ /* Any other register is saved in memory, fetch it but cache
+ a local copy of its value. */
+ *optimizedp = 0;
+ *lvalp = lval_memory;
+ *addrp = saved_regs[regnum];
+ *realnump = -1;
+ if (bufferp != NULL)
+ {
+ /* Read the value in from memory. */
+ read_memory (saved_regs[regnum], bufferp,
+ REGISTER_RAW_SIZE (regnum));
+ }
+ }
+ return;
+ }
+
+ /* No luck, assume this and the next frame have the same register
+ value. If a value is needed, pass the request on down the chain;
+ otherwise just return an indication that the value is in the same
+ register as the next frame. */
+ frame_register (frame, regnum, optimizedp, lvalp, addrp,
+ realnump, bufferp);
+}
+
+
+static void
+d10v_frame_register_unwind (struct frame_info *frame,
+ void **cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, void *bufferp)
+{
+ struct d10v_unwind_cache *info = d10v_frame_unwind_cache (frame, cache);
+ saved_regs_unwinder (frame, info->saved_regs, regnum, optimizedp,
+ lvalp, addrp, realnump, bufferp);
+}
+
+
+static void
+d10v_frame_pop (struct frame_info *fi, void **unwind_cache,
+ struct regcache *regcache)
+{
+ struct d10v_unwind_cache *info = d10v_frame_unwind_cache (fi, unwind_cache);
+ CORE_ADDR fp;
+ int regnum;
+ char raw_buffer[8];
+
+ fp = get_frame_base (fi);
+
+ /* now update the current registers with the old values */
+ for (regnum = A0_REGNUM; regnum < A0_REGNUM + NR_A_REGS; regnum++)
+ {
+ if (info->saved_regs[regnum])
+ {
+ read_memory (info->saved_regs[regnum], raw_buffer, REGISTER_RAW_SIZE (regnum));
+ deprecated_write_register_bytes (REGISTER_BYTE (regnum), raw_buffer,
+ REGISTER_RAW_SIZE (regnum));
+ }
+ }
+ for (regnum = 0; regnum < SP_REGNUM; regnum++)
+ {
+ if (info->saved_regs[regnum])
+ {
+ write_register (regnum, read_memory_unsigned_integer (info->saved_regs[regnum], REGISTER_RAW_SIZE (regnum)));
+ }
+ }
+ if (info->saved_regs[PSW_REGNUM])
+ {
+ write_register (PSW_REGNUM, read_memory_unsigned_integer (info->saved_regs[PSW_REGNUM], REGISTER_RAW_SIZE (PSW_REGNUM)));
+ }
+
+ write_register (PC_REGNUM, read_register (LR_REGNUM));
+ write_register (SP_REGNUM, fp + info->size);
+ target_store_registers (-1);
+ flush_cached_frames ();
+}
+
+static struct frame_unwind d10v_frame_unwind = {
+ d10v_frame_pop,
+ d10v_frame_pc_unwind,
+ d10v_frame_id_unwind,
+ d10v_frame_register_unwind
+};
+
+const struct frame_unwind *
+d10v_frame_p (CORE_ADDR pc)
+{
+ return &d10v_frame_unwind;
+}
+
static gdbarch_init_ftype d10v_gdbarch_init;
static struct gdbarch *
@@ -1527,10 +1586,6 @@
tdep = XMALLOC (struct gdbarch_tdep);
gdbarch = gdbarch_alloc (&info, tdep);
- /* NOTE: cagney/2002-12-06: This can be deleted when this arch is
- ready to unwind the PC first (see frame.c:get_prev_frame()). */
- set_gdbarch_deprecated_init_frame_pc (gdbarch, init_frame_pc_default);
-
switch (info.bfd_arch_info->mach)
{
case bfd_mach_d10v_ts2:
@@ -1626,11 +1681,6 @@
set_gdbarch_extract_struct_value_address (gdbarch, d10v_extract_struct_value_address);
set_gdbarch_use_struct_convention (gdbarch, d10v_use_struct_convention);
- set_gdbarch_frame_init_saved_regs (gdbarch, d10v_frame_init_saved_regs);
- set_gdbarch_init_extra_frame_info (gdbarch, d10v_init_extra_frame_info);
-
- set_gdbarch_pop_frame (gdbarch, d10v_pop_frame);
-
set_gdbarch_skip_prologue (gdbarch, d10v_skip_prologue);
set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
set_gdbarch_decr_pc_after_break (gdbarch, 4);
@@ -1641,9 +1691,6 @@
set_gdbarch_frame_args_skip (gdbarch, 0);
set_gdbarch_frameless_function_invocation (gdbarch, frameless_look_for_prologue);
- set_gdbarch_frame_chain (gdbarch, d10v_frame_chain);
- set_gdbarch_frame_chain_valid (gdbarch, d10v_frame_chain_valid);
- set_gdbarch_frame_saved_pc (gdbarch, d10v_frame_saved_pc);
set_gdbarch_saved_pc_after_call (gdbarch, d10v_saved_pc_after_call);
set_gdbarch_frame_num_args (gdbarch, frame_num_args_unknown);
@@ -1651,6 +1698,8 @@
set_gdbarch_register_sim_regno (gdbarch, d10v_register_sim_regno);
set_gdbarch_extra_stack_alignment_needed (gdbarch, 0);
+
+ frame_unwind_append_predicate (gdbarch, d10v_frame_p);
return gdbarch;
}