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alpha: Fix signal thunk unwind info

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This commit is contained in:
Richard Henderson 2013-11-16 06:34:39 +10:00
parent 1820b143aa
commit 027e32bd42
2 changed files with 19 additions and 4 deletions
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5
ports/ChangeLog.alpha
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@ -1,3 +1,8 @@
2013-11-16 Richard Henderson <rth@redhat.com>
* sysdeps/unix/sysv/linux/alpha/rt_sigaction.S: Include a nop
before each signal thunk.
2013-10-30 Mike Frysinger <vapier@gentoo.org>
* sysdeps/alpha/configure.in: Moved to ...

18
ports/sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
View file

@ -83,14 +83,21 @@ PSEUDO_END(__syscall_rt_sigaction)
cfi_offset (64, \base + 2 * 8)
.endm
.align 4
cfi_startproc
cfi_return_column (64)
.cfi_signal_frame
SIGCONTEXT_REGS -648
cfi_def_cfa_offset (648)
/* While this frame is marked as a signal frame, that only applies
to how this return address is handled for the outer frame.
The return address that arrived here, from the inner frame, is
not marked as a signal frame and so the unwinder still tries to
subtract 1 to examine the presumed call insn. Thus we must
extend the unwind info to a nop before the start. */
nop
.align 4
__syscall_sigreturn:
mov sp, a0
ldi v0, __NR_sigreturn
@ -98,8 +105,11 @@ __syscall_sigreturn:
.size __syscall_sigreturn, .-__syscall_sigreturn
.type __syscall_sigreturn, @function
.align 4
/* See above wrt including the nop. */
cfi_def_cfa_offset (176 + 648)
nop
.align 4
__syscall_rt_sigreturn:
mov sp,a0
ldi v0,__NR_rt_sigreturn