/* Target-dependent code for OpenBSD/amd64.
- Copyright 2003, 2004 Free Software Foundation, Inc.
+ Copyright 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GDB.
#include "defs.h"
#include "frame.h"
#include "gdbcore.h"
+#include "symtab.h"
+#include "objfiles.h"
#include "osabi.h"
#include "regset.h"
#include "target.h"
#include "gdb_assert.h"
#include "gdb_string.h"
-#include "x86-64-tdep.h"
+#include "amd64-tdep.h"
#include "i387-tdep.h"
#include "solib-svr4.h"
struct regcache *regcache, int regnum,
const void *regs, size_t len)
{
- const struct gdbarch_tdep *tdep = regset->descr;
+ const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch);
gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE);
i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
- amd64_supply_fxsave (regcache, regnum, (char *)regs + tdep->sizeof_gregset);
+ amd64_supply_fxsave (regcache, regnum,
+ ((const gdb_byte *)regs) + tdep->sizeof_gregset);
}
static const struct regset *
&& sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FXSAVE)
{
if (tdep->gregset == NULL)
- {
- tdep->gregset = XMALLOC (struct regset);
- tdep->gregset->descr = tdep;
- tdep->gregset->supply_regset = amd64obsd_supply_regset;
- }
+ tdep->gregset = regset_alloc (gdbarch, amd64obsd_supply_regset, NULL);
return tdep->gregset;
}
/* Support for signal handlers. */
+/* Default page size. */
static const int amd64obsd_page_size = 4096;
+/* Return whether the frame preceding NEXT_FRAME corresponds to an
+ OpenBSD sigtramp routine. */
+
static int
-amd64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
+amd64obsd_sigtramp_p (struct frame_info *next_frame)
{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1));
- const char sigreturn[] =
+ const gdb_byte sigreturn[] =
{
0x48, 0xc7, 0xc0,
0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */
0xcd, 0x80 /* int $0x80 */
};
- char *buf;
+ size_t buflen = (sizeof sigreturn) + 1;
+ gdb_byte *buf;
+ char *name;
+
+ /* If the function has a valid symbol name, it isn't a
+ trampoline. */
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (name != NULL)
+ return 0;
- if (name)
+ /* If the function lives in a valid section (even without a starting
+ point) it isn't a trampoline. */
+ if (find_pc_section (pc) != NULL)
return 0;
/* If we can't read the instructions at START_PC, return zero. */
- buf = alloca (sizeof sigreturn);
- if (target_read_memory (start_pc + 0x7, buf, sizeof sigreturn))
+ buf = alloca ((sizeof sigreturn) + 1);
+ if (!safe_frame_unwind_memory (next_frame, start_pc + 6, buf, buflen))
return 0;
- /* Check for sigreturn(2). */
- if (memcmp (buf, sigreturn, sizeof sigreturn))
+ /* Check for sigreturn(2). Depending on how the assembler encoded
+ the `movq %rsp, %rdi' instruction, the code starts at offset 6 or
+ 7. */
+ if (memcmp (buf, sigreturn, sizeof sigreturn)
+ && memcpy (buf + 1, sigreturn, sizeof sigreturn))
return 0;
return 1;
static CORE_ADDR
amd64obsd_sigcontext_addr (struct frame_info *next_frame)
{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ ULONGEST offset = (pc & (amd64obsd_page_size - 1));
+
/* The %rsp register points at `struct sigcontext' upon entry of a
- signal trampoline. */
- return frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
+ signal trampoline. The relevant part of the trampoline is
+
+ call *%rax
+ movq %rsp, %rdi
+ pushq %rdi
+ movq $SYS_sigreturn,%rax
+ int $0x80
+
+ (see /usr/src/sys/arch/amd64/amd64/locore.S). The `pushq'
+ instruction clobbers %rsp, but its value is saved in `%rdi'. */
+
+ if (offset > 5)
+ return frame_unwind_register_unsigned (next_frame, AMD64_RDI_REGNUM);
+ else
+ return frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
}
\f
/* OpenBSD 3.5 or later. */
tdep->jb_pc_offset = 7 * 8;
- set_gdbarch_pc_in_sigtramp (gdbarch, amd64obsd_pc_in_sigtramp);
+ tdep->sigtramp_p = amd64obsd_sigtramp_p;
tdep->sigcontext_addr = amd64obsd_sigcontext_addr;
tdep->sc_reg_offset = amd64obsd_sc_reg_offset;
tdep->sc_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset);