diff options
Diffstat (limited to 'src/runtime/sys_darwin_386.s')
| -rw-r--r-- | src/runtime/sys_darwin_386.s | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/src/runtime/sys_darwin_386.s b/src/runtime/sys_darwin_386.s index 1bc1a63c28..d318509e0a 100644 --- a/src/runtime/sys_darwin_386.s +++ b/src/runtime/sys_darwin_386.s @@ -675,9 +675,42 @@ ok: POPL BP RET -// Not used on 386. +// syscallPtr is like syscall except the libc function reports an +// error by returning NULL and setting errno. TEXT runtime·syscallPtr(SB),NOSPLIT,$0 - MOVL $0xf1, 0xf1 // crash + PUSHL BP + MOVL SP, BP + SUBL $24, SP + MOVL 32(SP), CX + MOVL (0*4)(CX), AX // fn + MOVL (1*4)(CX), DX // a1 + MOVL DX, 0(SP) + MOVL (2*4)(CX), DX // a2 + MOVL DX, 4(SP) + MOVL (3*4)(CX), DX // a3 + MOVL DX, 8(SP) + + CALL AX + + MOVL 32(SP), CX + MOVL AX, (4*4)(CX) // r1 + MOVL DX, (5*4)(CX) // r2 + + // syscallPtr libc functions return NULL on error + // and set errno. + TESTL AX, AX + JNE ok + + // Get error code from libc. + CALL libc_error(SB) + MOVL (AX), AX + MOVL 32(SP), CX + MOVL AX, (6*4)(CX) // err + +ok: + XORL AX, AX // no error (it's ignored anyway) + MOVL BP, SP + POPL BP RET // syscall6 calls a function in libc on behalf of the syscall package. |