diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/sparc/sparc64/clone.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/sparc/sparc64/clone.S | 75 |
1 files changed, 54 insertions, 21 deletions
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/clone.S b/sysdeps/unix/sysv/linux/sparc/sparc64/clone.S index a7c248b2e8..ebfce9e2c5 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/clone.S +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/clone.S @@ -22,34 +22,52 @@ #include <asm/errno.h> #include <asm/unistd.h> +#include <tcb-offsets.h> +#include <sysdep.h> -/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ +#define CLONE_VM 0x00000100 +#define CLONE_THREAD 0x00010000 + +/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, + pid_t *ptid, void *tls, pid_t *ctid); */ + + .register %g2,#scratch + .register %g3,#scratch .text - .align 4 - .globl __clone - .type __clone,@function -__clone: +ENTRY (__clone) save %sp, -192, %sp + cfi_def_cfa_register(%fp) + cfi_window_save + cfi_register(%o7, %i7) /* sanity check arguments */ - brz,pn %i0, 99f - mov %i0, %l0 /* save fn */ - brz,pn %i1, 99f - mov %i3, %l3 /* save arg */ + brz,pn %i0, 99f /* fn non-NULL? */ + mov %i0, %g2 + brz,pn %i1, 99f /* child_stack non-NULL? */ + mov %i2, %o0 /* clone flags */ + + /* The child_stack is the top of the stack, allocate one + whole stack frame from that as this is what the kernel + expects. Also, subtract STACK_BIAS. */ + sub %i1, 192 + 0x7ff, %o1 + mov %i3, %g3 + mov %i2, %g4 + + mov %i4,%o2 /* PTID */ + mov %i5,%o3 /* TLS */ + ldx [%fp+0x7ff+176],%o4 /* CTID */ /* Do the system call */ - sub %i1, 0x7ff, %o1 - mov %i2, %o0 set __NR_clone, %g1 ta 0x6d bcs,pn %xcc, 99f nop brnz,pn %o1, __thread_start - mov %o0, %i0 - ret - restore + nop + jmpl %i7 + 8, %g0 + restore %o0, %g0, %o0 99: #ifndef _LIBC_REENTRANT #ifdef PIC @@ -71,18 +89,33 @@ __clone: nop st %i0, [%o0] #endif - ret + jmpl %i7 + 8, %g0 restore %g0,-1,%o0 - .size __clone, .-__clone +END(__clone) .type __thread_start,@function __thread_start: + cfi_startproc +#ifdef RESET_PID + sethi %hi(CLONE_THREAD), %l0 + andcc %g4, %l0, %g0 + bne,pt %icc, 1f + andcc %g4, CLONE_VM, %g0 + bne,a,pn %icc, 2f + mov -1,%o0 + set __NR_getpid,%g1 + ta 0x6d +2: st %o0,[%g7 + PID] + st %o0,[%g7 + TID] +1: +#endif mov %g0, %fp /* terminate backtrace */ - sub %sp, 6*8, %sp /* provide arg storage */ - call %l0 - mov %l3,%o0 + call %g2 + mov %g3,%o0 call _exit,0 nop - .size __thread_start, .-__thread_start + cfi_endproc + + .size __thread_start, .-__thread_start -weak_alias(__clone, clone) +weak_alias (__clone, clone) |