mirror/glibc
2
0
Fork 0
mirror of git://sourceware.org/git/glibc.git synced 2025-01-12 12:07:12 +08:00
Code Issues Packages Projects Releases Wiki Activity

Correct stack alignment. Clean up flag bit tests. Remove redundent SP assignment. Add TOC register save/restore around function call.

Browse Source
This commit is contained in:
Ulrich Drepper 2004-12-15 20:37:06 +00:00
parent ddd34672ee
commit a2eae4ccb1
1 changed files with 9 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S
View File

@ -42,18 +42,17 @@ ENTRY (BP_SYM (__clone))
/* Check for child_stack == NULL || fn == NULL. */
cmpdi cr0,r4,0
ld r0,0(r3)
cmpdi cr1,r0,0
cmpdi cr1,r3,0
cror cr0*4+eq,cr1*4+eq,cr0*4+eq
beq- cr0,L(badargs)
/* Set up stack frame for parent. */
stdu r1,-88(r1)
stdu r1,-80(r1)
std r29,56(r1)
std r30,64(r1)
std r31,72(r1)
#ifdef RESET_PID
std r28,80(r1)
std r28,48(r1)
#endif
/* Set up stack frame for child. */
@ -85,18 +84,12 @@ ENTRY (BP_SYM (__clone))
crandc cr1*4+eq,cr1*4+eq,cr0*4+so
bne- cr1,L(parent) /* The '-' is to minimise the race. */
/* On at least mklinux DR3a5, clone() doesn't actually change
the stack pointer. I'm pretty sure this is a bug, because
it adds a race condition if a signal is sent to a thread
just after it is created (in the previous three instructions). */
mr r1,r30
#ifdef RESET_PID
rldicl. r0,r28,48,63 /* This is & CLONE_THREAD */
bne+ r0,L(oldpid)
rldicl. r0,r28,56,63 /* This is & CLONE_VM */
andis. r0,r28,CLONE_THREAD>>16
bne+ cr0,L(oldpid)
andi. r0,r28,CLONE_VM
li r3,-1
bne- r0,L(nomoregetpid)
bne- cr0,L(nomoregetpid)
DO_CALL(SYS_ify(getpid))
L(nomoregetpid):
stw r3,TID(r13)
@ -122,12 +115,12 @@ L(oldpid):
L(parent):
/* Parent. Restore registers & return. */
#ifdef RESET_PID
ld r28,88(r1)
ld r28,48(r1)
#endif
ld r31,72(r1)
ld r30,64(r1)
ld r29,56(r1)
addi r1,r1,88
addi r1,r1,80
bnslr+
b JUMPTARGET(__syscall_error)