ref: 8355d0e6cd741731b972955dd10dfb494c3370bf
dir: /lib/thread/start+osx-x64.s/
# The entry point for thread start, registered with bsdthread_register
# %rdi: pthread (0, for us)
# %rsi: mach thread port (ignored)
# %rdx: func
# %rcx: env
# %r8: stack
# %r9: flags (= 0)
# %rsp: stack - C_64_REDZONE_LEN (= stack - 128)
.globl _thread$start
_thread$start:
/* call the function */
movq %r8, %rsp /* set up stack */
movq %rcx,%rdi
callq *%rdx /* call function */
/*
const thread.exit : (stacksz : std.size -> void)
NOTE: must be called from the bottom of the stack, since
we assume that %rbp is in the top 4k of the stack.
*/
.globl _thread$exit
_thread$exit:
/* find top of stack */
movq %rbp,%rdi /* addr */
andq $~0xfff,%rdi /* align it */
addq $0x1000,%rdi
/* munmap(base, size) */
movq $0x2000049,%rax /* munmap */
movq -8(%rdi),%rsi /* size */
subq %rsi,%rdi /* move to base ptr */
syscall
/* exit the thread */
movq $0x2000169, %rax /* Sysbsdthread_terminate */
movq $0, %rdi /* stack */
movq $0, %rsi /* len */
movq $0, %rdx /* sem */
syscall