diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/unix/sysv/linux/mips/clone.S | 68 |
1 files changed, 32 insertions, 36 deletions
diff --git a/sysdeps/unix/sysv/linux/mips/clone.S b/sysdeps/unix/sysv/linux/mips/clone.S index 4d6408d..30499bc 100644 --- a/sysdeps/unix/sysv/linux/mips/clone.S +++ b/sysdeps/unix/sysv/linux/mips/clone.S @@ -1,4 +1,4 @@ -/* Copyright (C) 1996, 1997 Free Software Foundation, Inc. +/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>, 1996. @@ -26,9 +26,9 @@ #define _ERRNO_H 1 #include <bits/errno.h> -/* int clone(int (*fn)(), void *child_stack, int flags, int nargs, ...) */ +/* int clone(int (*fn)(), void *child_stack, int flags, void *arg) */ -#define FRAMESZ 4*SZREG +#define FRAMESZ 8*SZREG #if _MIPS_SIM == _MIPS_SIM_ABI32 #define MAX_REG_ARGS 4 #else @@ -36,14 +36,16 @@ #endif .text -NESTED(__clone,4*SZREG,sp) -#ifdef PIC +NESTED(__clone,FRAMESZ,sp) +#ifdef __PIC__ .set noreorder .cpload $25 .set reorder - .cprestore 16 -#endif PTR_SUBIU sp,FRAMESZ + .cprestore SZREG*4 +#else + PTR_SUBIU sp,FRAMESZ +#endif #ifdef PROF .set noat move $1,ra @@ -51,25 +53,20 @@ NESTED(__clone,4*SZREG,sp) .set at #endif + REG_S s0,FRAMESZ-SZREG*2(sp) + REG_S s1,FRAMESZ-SZREG*3(sp) /* Sanity check arguments. */ li v0,EINVAL beqz a0,error /* no NULL function pointers */ beqz a1,error /* no NULL stack pointers */ - bltz a3,error /* no negative argument counts */ /* Allocate space on the new stack and copy args over */ - move t0,a3 # save nargs for __thread_start - PTR_SLL t1,a3,PTR_SCALESHIFT - PTR_ADDU t1,a3,sp -1: REG_L t2,-SZREG(t1) - PTR_SUBIU t1,SZREG - REG_S t2,-SZREG(a1) - PTR_SUBIU a3,1 - PTR_SUBIU a1,SZREG - bnez a3,1b + /* Save the arg for user's function */ + move s0,a3 /* Save arg __thread_start. */ + move s1,a0 /* Save func. pointer. */ + /* Do the system call */ - move t9,a0 # get fn ptr out of the way move a0,a2 li v0,__NR_clone syscall @@ -78,11 +75,15 @@ NESTED(__clone,4*SZREG,sp) beqz v0,__thread_start /* Successful return from the parent */ + REG_L s0,FRAMESZ-SZREG*2(sp) + REG_L s1,FRAMESZ-SZREG*3(sp) PTR_ADDIU sp,FRAMESZ ret /* Something bad happened -- no child created */ error: + REG_L s0,FRAMESZ-SZREG*2(sp) + REG_L s1,FRAMESZ-SZREG*3(sp) PTR_ADDIU sp,FRAMESZ #ifdef PIC la t9,__syscall_error @@ -96,30 +97,25 @@ error: its own function so that we can terminate the stack trace with our debug info. - At this point we have t0=nargs, t9=fn, sp=&arg[0]. */ + At this point we have s0=arg, s1=fn. */ -NESTED(__thread_start,32,sp) - /* Stackframe has been created on entry of clone() */ - /* Calculate address of jump into argument loading code */ - li t1,MAX_REG_ARGS - slt t0,t1,t2 /* max MAX_REG_ARGS args in registers */ - MOVN (t2,t1,t0) - la v0,arg0 - PTR_SLL t1,t0,PTR_SCALESHIFT - PTR_SUBU v0,t1 - jr v0 +NESTED(__thread_start,FRAMESZ,sp) + /* The stackframe has been created on entry of clone(). */ + /* Resort the arg for user's function. */ + move a0,s0 + move t9,s1 - /* Load the integer register arguments */ - REG_L a0,SZREG(sp) -arg0: - - /* Call the user's function */ + /* Call the user's function. */ jalr t9 - /* Call _exit rather than doing it inline for breakpoint purposes */ + /* Call _exit rather than doing it inline for breakpoint purposes. */ move a0,v0 +#ifdef __PIC__ + la t9,_exit + jalr t9 +#else jal _exit - +#endif END(__thread_start) weak_alias(__clone, clone) |