diff options
Diffstat (limited to 'src/thread/x86_64')
| -rw-r--r-- | src/thread/x86_64/clone.s | 49 |
1 files changed, 29 insertions, 20 deletions
diff --git a/src/thread/x86_64/clone.s b/src/thread/x86_64/clone.s index bf128a47..4db081cd 100644 --- a/src/thread/x86_64/clone.s +++ b/src/thread/x86_64/clone.s @@ -1,21 +1,30 @@ -/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */ .text -.global __uniclone -.type __uniclone,@function -/* rdi = child_stack, rsi = start, rdx = pthread_struct */ -__uniclone: - subq $8,%rsp /* pad parent stack to prevent branch later */ - subq $24,%rdi /* grow child_stack */ - mov %rsi,8(%rdi) /* push start onto child_stack as return ptr */ - mov %rdx,0(%rdi) /* push pthread_struct onto child_stack */ - mov %rdx,%r8 /* r8 = tls */ - mov %rdi,%rsi /* rsi = child_stack */ - leaq 40(%rdx),%r10 /* r10 = child_id */ - movl $56,%eax /* clone syscall number */ - movl $0x7d0f00,%edi /* rdi = flags */ - mov %r10,%rdx /* rdx = parent_id */ - syscall /* clone(flags, child_stack, parent_id, - * child_id, tls) */ - pop %rdi /* child stack: restore pthread_struct - * parent stack: undo rsp displacement */ - ret +.global __clone +.weak clone +.type __clone,@function +.type clone,@function +__clone: +clone: + xor %eax,%eax + mov $56,%al + mov %rdi,%r11 + mov %rdx,%rdi + mov %r8,%rdx + mov %r9,%r8 + mov 8(%rsp),%r10 + mov %r11,%r9 + and $-16,%rsi + sub $8,%rsi + mov %rcx,(%rsi) + syscall + test %eax,%eax + jnz 1f + xor %ebp,%ebp + pop %rdi + call *%r9 + mov %eax,%edi + xor %eax,%eax + mov $60,%al + syscall + hlt +1: ret |