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* amd64obsd-tdep.c: Include "regcache.h" and "bsd-uthread.h".

Browse Source 
(amd64obsd_uthread_reg_offset): New variable.
(AMD64OBSD_UTHREAD_RSP_OFFSET): New define.
(amd64obsd_supply_uthread, amd64obsd_collect_uthread): New
functions.
(amd64obsd_init_abi): Set supply_uthread and collect_uthread.
* Makefile.in (amd64obsd-tdep.o): Update dependencies.
This commit is contained in:
Mark Kettenis
2005-12-04 20:19:25 +00:00
parent 927e625f4b
commit d78749b4b8
3 changed files with 140 additions and 3 deletions
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127
gdb/amd64obsd-tdep.c
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@ -25,6 +25,7 @@
#include "symtab.h"
#include "objfiles.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "target.h"
@ -34,6 +35,7 @@
#include "amd64-tdep.h"
#include "i387-tdep.h"
#include "solib-svr4.h"
#include "bsd-uthread.h"
/* Support for core dumps. */
@ -211,6 +213,127 @@ static int amd64obsd_sc_reg_offset[] =
15 * 8 /* %gs */
};
/* From /usr/src/lib/libpthread/arch/amd64/uthread_machdep.c. */
static int amd64obsd_uthread_reg_offset[] =
{
19 * 8, /* %rax */
16 * 8, /* %rbx */
18 * 8, /* %rcx */
17 * 8, /* %rdx */
14 * 8, /* %rsi */
13 * 8, /* %rdi */
15 * 8, /* %rbp */
-1, /* %rsp */
12 * 8, /* %r8 ... */
11 * 8,
10 * 8,
9 * 8,
8 * 8,
7 * 8,
6 * 8,
5 * 8, /* ... %r15 */
20 * 8, /* %rip */
4 * 8, /* %eflags */
21 * 8, /* %cs */
-1, /* %ss */
3 * 8, /* %ds */
2 * 8, /* %es */
1 * 8, /* %fs */
0 * 8 /* %gs */
};
/* Offset within the thread structure where we can find the saved
stack pointer (%esp). */
#define AMD64OBSD_UTHREAD_RSP_OFFSET 400
static void
amd64obsd_supply_uthread (struct regcache *regcache,
int regnum, CORE_ADDR addr)
{
CORE_ADDR sp_addr = addr + AMD64OBSD_UTHREAD_RSP_OFFSET;
CORE_ADDR sp = 0;
gdb_byte buf[8];
int i;
gdb_assert (regnum >= -1);
if (regnum == -1 || regnum == AMD64_RSP_REGNUM)
{
int offset;
/* Fetch stack pointer from thread structure. */
sp = read_memory_unsigned_integer (sp_addr, 8);
/* Adjust the stack pointer such that it looks as if we just
returned from _thread_machdep_switch. */
offset = amd64obsd_uthread_reg_offset[AMD64_RIP_REGNUM] + 8;
store_unsigned_integer (buf, 8, sp + offset);
regcache_raw_supply (regcache, AMD64_RSP_REGNUM, buf);
}
for (i = 0; i < ARRAY_SIZE (amd64obsd_uthread_reg_offset); i++)
{
if (amd64obsd_uthread_reg_offset[i] != -1
&& (regnum == -1 || regnum == i))
{
/* Fetch stack pointer from thread structure (if we didn't
do so already). */
if (sp == 0)
sp = read_memory_unsigned_integer (sp_addr, 8);
/* Read the saved register from the stack frame. */
read_memory (sp + amd64obsd_uthread_reg_offset[i], buf, 8);
regcache_raw_supply (regcache, i, buf);
}
}
}
static void
amd64obsd_collect_uthread (const struct regcache *regcache,
int regnum, CORE_ADDR addr)
{
CORE_ADDR sp_addr = addr + AMD64OBSD_UTHREAD_RSP_OFFSET;
CORE_ADDR sp = 0;
gdb_byte buf[8];
int i;
gdb_assert (regnum >= -1);
if (regnum == -1 || regnum == AMD64_RSP_REGNUM)
{
int offset;
/* Calculate the stack pointer (frame pointer) that will be
stored into the thread structure. */
offset = amd64obsd_uthread_reg_offset[AMD64_RIP_REGNUM] + 8;
regcache_raw_collect (regcache, AMD64_RSP_REGNUM, buf);
sp = extract_unsigned_integer (buf, 8) - offset;
/* Store the stack pointer. */
write_memory_unsigned_integer (sp_addr, 8, sp);
/* The stack pointer was (potentially) modified. Make sure we
build a proper stack frame. */
regnum = -1;
}
for (i = 0; i < ARRAY_SIZE (amd64obsd_uthread_reg_offset); i++)
{
if (amd64obsd_uthread_reg_offset[i] != -1
&& (regnum == -1 || regnum == i))
{
/* Fetch stack pointer from thread structure (if we didn't
calculate it already). */
if (sp == 0)
sp = read_memory_unsigned_integer (sp_addr, 8);
/* Write the register into the stack frame. */
regcache_raw_collect (regcache, i, buf);
write_memory (sp + amd64obsd_uthread_reg_offset[i], buf, 8);
}
}
}
static void
amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
@ -233,6 +356,10 @@ amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
tdep->sc_reg_offset = amd64obsd_sc_reg_offset;
tdep->sc_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset);
/* OpenBSD provides a user-level threads implementation. */
bsd_uthread_set_supply_uthread (gdbarch, amd64obsd_supply_uthread);
bsd_uthread_set_collect_uthread (gdbarch, amd64obsd_collect_uthread);
/* OpenBSD uses SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);