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* sysdeps/unix/sysv/linux/alpha/rt_sigaction.S: Prefix stubs with

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__syscall_, move nop inside, adjust users by +4.
This commit is contained in:
Richard Henderson 2004-01-16 04:59:55 +00:00
parent df6e7e29eb
commit 83c784e84c
1 changed files with 25 additions and 29 deletions
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54
sysdeps/unix/sysv/linux/alpha/rt_sigaction.S
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@ -26,7 +26,6 @@
This just about halves signal delivery time. */
#ifdef __NR_rt_sigaction
.text
ENTRY(__syscall_rt_sigaction)
@ -42,12 +41,20 @@ ENTRY(__syscall_rt_sigaction)
beq a1, 0f
ldl t0, 8(a1) # sa_flags
ldah a4, sigreturn(gp) !gprelhigh
ldah t1, rt_sigreturn(gp) !gprelhigh
lda a4, sigreturn(a4) !gprellow
lda t1, rt_sigreturn(t1) !gprellow
and t0, 0x00000040, t0 # SA_SIGINFO
/* The unwinder will subtract one from the return address when
attempting to find the call instruction that led us here.
Since we didn't get here via a normal call, if we do nothing
we would pick up the wrong symbol and the wrong FDE. Account
for this by adding a nop to the start of the function and
then skipping it here by adding 4. */
ldah a4, __syscall_sigreturn+4(gp) !gprelhigh
ldah t1, __syscall_rt_sigreturn+4(gp) !gprelhigh
lda a4, __syscall_sigreturn+4(a4) !gprellow
lda t1, __syscall_rt_sigreturn+4(t1) !gprellow
and t0, 0x40, t0 # SA_SIGINFO
cmovne t0, t1, a4
0: ldi v0, __NR_rt_sigaction
callsys
bne a3, SYSCALL_ERROR_LABEL
@ -57,10 +64,10 @@ PSEUDO_END(__syscall_rt_sigaction)
/* To enable unwinding through the signal frame without special hackery
elsewhere, describe the entire struct sigcontext with unwind info.
Note that we begin the unwind info one instruction before the start
of the function; the unwinder will subtract one from the return address
attempting to find the call instruction that led us here, since we
didn't get here via a normal call. */
In order to minimize the size of the encoding, we set the CFA to the
end of the sigcontext, which makes all of the registers have small
negative offsets from that. */
.macro SIGCONTEXT_REGS_I base, from=0
cfi_offset (\from, \base + (4 + \from) * 8)
@ -91,34 +98,23 @@ PSEUDO_END(__syscall_rt_sigaction)
cfi_startproc
cfi_return_column (64)
SIGCONTEXT_REGS -648
cfi_def_cfa_offset (648)
__syscall_sigreturn:
nop
sigreturn:
mov sp, a0
ldi v0, __NR_sigreturn
callsys
cfi_endproc
.size sigreturn, .-sigreturn
.type sigreturn, @function
.size __syscall_sigreturn, .-__syscall_sigreturn
.type __syscall_sigreturn, @function
cfi_startproc
cfi_return_column (64)
SIGCONTEXT_REGS -648
cfi_def_cfa_offset (176 + 648)
__syscall_rt_sigreturn:
nop
rt_sigreturn:
mov sp,a0
ldi v0,__NR_rt_sigreturn
callsys
cfi_endproc
.size rt_sigreturn, .-rt_sigreturn
.type rt_sigreturn, @function
.size __syscall_rt_sigreturn, .-__syscall_rt_sigreturn
.type __syscall_rt_sigreturn, @function
#else
ENTRY(__syscall_rt_sigaction)
ldgp $29,0($27)
.prologue 1
ldi $0,ENOSYS
SYSCALL_ERROR_HANDLER
END(__syscall_rt_sigaction)
#endif
cfi_endproc