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PowerPC: Fix uc_link == NULL handling for makecontex.

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If the function registered with makecontext returns with a NULL context
link the process should exit with zero, not non-zero.
This commit is contained in:
Andreas Schwab 2012-11-01 20:10:39 -05:00 committed by Ryan S. Arnold
parent b3563932f8
commit d6cffd3ec0
2 changed files with 20 additions and 15 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2012-11-01 Andreas Schwab <schwab@linux-m68k.org>
* sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S: If the
function returns with a NULL context exit with zero.
2012-11-01 Tulio Magno Quites Machado Filho <tuliom@linux.vnet.ibm.com>
* sysdeps/powerpc/Makefile (cflags): Remove -mnew-mnemonics.

30
sysdeps/unix/sysv/linux/powerpc/powerpc64/makecontext.S
View File

@ -134,26 +134,26 @@ L(noparms):
'makecontext' call. If the pointer is NULL the process must
terminate. */
L(exitcode):
/* Recover the ucontext and TOC from the dummy frame. */
ld r1,FRAME_BACKCHAIN(r1) /* Unstack the parameter save area frame. */
ld r3,FRAME_PARM1_SAVE(r1)
ld r2,FRAME_TOC_SAVE(r1)
ld r3,UCONTEXT_LINK(r3) /* Load the resume context. */
cmpdi r3,0
beq L(BADSTATUS)
/* Recover the ucontext and TOC from the dummy frame. */
ld r1,FRAME_BACKCHAIN(r1) /* Unstack the parameter save area frame. */
ld r3,FRAME_PARM1_SAVE(r1)
ld r2,FRAME_TOC_SAVE(r1)
ld r3,UCONTEXT_LINK(r3) /* Load the resume context. */
cmpdi r3,0
beq L(do_exit)
bl JUMPTARGET(__setcontext)
nop
L(BADSTATUS):
/* If setcontext returns (which can happen if the syscall fails) we will
exit the program with error status (-1). */
li r3,-1
/* If setcontext returns (which can happen if the syscall fails) we will
exit the program with error status (-1). */
li r3,-1
L(do_exit):
#ifdef SHARED
b JUMPTARGET(__GI_exit);
b JUMPTARGET(__GI_exit);
#else
b JUMPTARGET(exit);
nop
b JUMPTARGET(exit);
nop
#endif
b L(do_exit)
/* The address of the exit code is in the link register. Store the lr
in the ucontext as LNK so the target function will return to our