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Fix register save offset for nios2 signal handler trampolines.

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2015-05-08  Sandra Loosemore  <sandra@codesourcery.com>

	gdb/
	* nios2-linux-tdep.c (NIOS2_SIGRETURN_TRAMP_ADDR): Define.
	(NIOS2_SIGRETURN_REGSAVE_OFFSET): Define.
	(nios2_linux_rt_sigreturn_init): Adjust base address of
	register save area.
This commit is contained in:
Sandra Loosemore 2015-05-08 12:34:52 -07:00
parent 21e94bd9f0
commit 35d54293c3
2 changed files with 28 additions and 2 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2015-05-08 Sandra Loosemore <sandra@codesourcery.com>
* nios2-linux-tdep.c (NIOS2_SIGRETURN_TRAMP_ADDR): Define.
(NIOS2_SIGRETURN_REGSAVE_OFFSET): Define.
(nios2_linux_rt_sigreturn_init): Adjust base address of
register save area.
2015-05-08 Sandra Loosemore <sandra@codesourcery.com>
* nios2-tdep.c (nios2_breakpoint_from_pc): Revert to using

23
gdb/nios2-linux-tdep.c
View File

@ -114,7 +114,25 @@ nios2_iterate_over_regset_sections (struct gdbarch *gdbarch,
}
/* Initialize a trad-frame cache corresponding to the tramp-frame.
FUNC is the address of the instruction TRAMP[0] in memory. */
FUNC is the address of the instruction TRAMP[0] in memory.
This ABI is not documented. It corresponds to rt_setup_ucontext in
the kernel arch/nios2/kernel/signal.c file.
The key points are:
- The kernel creates a trampoline at the hard-wired address 0x1044.
- The stack pointer points to an object of type struct rt_sigframe.
The definition of this structure is not exported from the kernel.
The register save area is located at offset 152 bytes (as determined
by inspection of the stack contents in the debugger), and the
registers are saved as r1-r23, ra, fp, gp, ea, sp.
This interface was implemented with kernel version 3.19 (the first
official mainline kernel). Older unofficial kernel versions used
incompatible conventions; we do not support those here. */
#define NIOS2_SIGRETURN_TRAMP_ADDR 0x1044
#define NIOS2_SIGRETURN_REGSAVE_OFFSET 152
static void
nios2_linux_rt_sigreturn_init (const struct tramp_frame *self,
@ -122,7 +140,8 @@ nios2_linux_rt_sigreturn_init (const struct tramp_frame *self,
struct trad_frame_cache *this_cache,
CORE_ADDR func)
{
CORE_ADDR base = func + 41 * 4;
CORE_ADDR sp = get_frame_register_unsigned (next_frame, NIOS2_SP_REGNUM);
CORE_ADDR base = sp + NIOS2_SIGRETURN_REGSAVE_OFFSET;
int i;
for (i = 0; i < 23; i++)