diff options
Diffstat (limited to 'libc/sysdeps/linux/arm/clone.S')
| -rw-r--r-- | libc/sysdeps/linux/arm/clone.S | 53 |
1 files changed, 52 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/arm/clone.S b/libc/sysdeps/linux/arm/clone.S index a5a847d1e..d9483735d 100644 --- a/libc/sysdeps/linux/arm/clone.S +++ b/libc/sysdeps/linux/arm/clone.S @@ -24,17 +24,66 @@ #include <features.h> #include <bits/errno.h> #include <sys/syscall.h> +#include <bits/arm_asm.h> -#ifdef __NR_clone +#if defined(__NR_clone) /* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */ .text .global clone .type clone,%function .align 2 +#if defined(THUMB1_ONLY) +.thumb_func clone: @ sanity check args cmp r0, #0 + beq __einval + cmp r1, #0 + beq __einval + + @ insert the args onto the new stack + sub r1, r1, #8 + str r3, [r1, #4] + @ save the function pointer as the 0th element + str r0, [r1] + + @ do the system call + @ get flags + mov r0, r2 + @ new sp is already in r1 + DO_CALL (clone) + movs a1, a1 + blt __error + beq 1f + bx lr +1: + + @ pick the function arg and call address off the stack and execute + ldr r0, [sp, #4] + ldr r1, [sp] + bl 2f @ blx r1 + + @ and we are done, passing the return value through r0 + bl HIDDEN_JUMPTARGET(_exit) + @ Should never return + b . + +2: + bx r1 + +__einval: + ldr r0, =-EINVAL +__error: + push {r3, lr} + bl __syscall_error + POP_RET +.pool +#else +clone: + @ sanity check args + cmp r0, #0 + IT(te, ne) cmpne r1, #0 moveq r0, #-EINVAL beq __error @@ -52,6 +101,7 @@ clone: DO_CALL (clone) movs a1, a1 blt __error + IT(t, ne) #if defined(__USE_BX__) bxne lr #else @@ -68,6 +118,7 @@ clone: __error: b __syscall_error +#endif .size clone,.-clone |