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[Bug gdb/15518] New: reverse debugging not working for ARM under cross-debugging setup
- From: "bccheng at android dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Wed, 22 May 2013 20:40:13 +0000
- Subject: [Bug gdb/15518] New: reverse debugging not working for ARM under cross-debugging setup
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=15518
Bug #: 15518
Summary: reverse debugging not working for ARM under
cross-debugging setup
Product: gdb
Version: 7.6
Status: NEW
Severity: normal
Priority: P2
Component: gdb
AssignedTo: unassigned@sourceware.org
ReportedBy: bccheng@android.com
Classification: Unclassified
In arm-tdep.c arm_mem_r is declared as the following:
/* ARM memory record structure. */
struct arm_mem_r
{
uint32_t len; /* Record length. */
CORE_ADDR addr; /* Memory address. */
};
In various places the content is first initialized via the directly-addressed
record_buf_mem buffer:
uint32_t record_buf_mem[8];
:
record_buf_mem[0] = 4;
record_buf_mem[1] = tgt_mem_addr;
and copied over via the MEM_ALLOC macro:
#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)
The problem is that CORE_ADDR is declared as long and on 64-bit host it is 8
byte. Because of that record_buf_mem[1] is no longer the starting address of
the addr field but a padding space. Here is the memory dump through top-gdb:
(top-gdb) p /x arm_record.arm_mems[0]
$23 = {len = 0x4, addr = 0xe5832000}
(top-gdb) x /4x arm_record.arm_mems
0xb7f8d0: 0x00000004 0x0109e020 0xe5832000 0x00000000
where 0x0109e020 is the desired arm_record.arm_mems[0].addr value.
My temporary hack in my project is to declare thje addr field as uint32_t, but
I think it is not a generic fix and will cause problems for aarch64.
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