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* sparc-linux-tdep.c (sparc32_linux_step_trap): New.

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(sparc32_linux_init_abi): Hook it into tdep->step_trap.
	* sparc64-linux-tdep.c (sparc64_linux_step_trap): New.
	(sparc64_linux_init_abi): Hook it into tdep->step_trap.
	* Makefile.in: Update dependencies.
This commit is contained in:
David S. Miller
2006-04-08 21:01:36 +00:00
parent 5cf3f6e292
commit 0b4294d3c0
4 changed files with 92 additions and 2 deletions
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46
gdb/sparc-linux-tdep.c
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@@ -126,6 +126,49 @@ sparc32_linux_sigframe_init (const struct tramp_frame *self,
trad_frame_set_id (this_cache, frame_id_build (base, func));
}
/* Return the address of a system call's alternative return
address. */
static CORE_ADDR
sparc32_linux_step_trap (unsigned long insn)
{
if (insn == 0x91d02010)
{
ULONGEST sc_num;
regcache_cooked_read_unsigned (current_regcache,
SPARC_G1_REGNUM, &sc_num);
/* __NR_rt_sigreturn is 101 and __NR_sigreturn is 216 */
if (sc_num == 101 || sc_num == 216)
{
ULONGEST sp, pc_offset;
regcache_cooked_read_unsigned (current_regcache,
SPARC_SP_REGNUM, &sp);
/* The kernel puts the sigreturn registers on the stack,
and this is where the signal unwinding state is take from
when returning from a signal.
For __NR_sigreturn, this register area sits 96 bytes from
the base of the stack. The saved PC sits 4 bytes into the
sigreturn register save area.
For __NR_rt_sigreturn a siginfo_t, which is 128 bytes, sits
right before the sigreturn register save area. */
pc_offset = 96 + 4;
if (sc_num == 101)
pc_offset += 128;
return read_memory_unsigned_integer (sp + pc_offset, 4);
}
}
return 0;
}
static void
sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
@@ -152,6 +195,9 @@ sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* Make sure we can single-step over signal return system calls. */
tdep->step_trap = sparc32_linux_step_trap;
/* Hook in the DWARF CFI frame unwinder. */
frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
}