runtime: start new darwin/amd64 threads on correct stack,
then enable stack check.
R=r
https://golang.org/cl/165100
diff --git a/src/pkg/runtime/darwin/amd64/sys.s b/src/pkg/runtime/darwin/amd64/sys.s
index 22a7c81..1654258 100644
--- a/src/pkg/runtime/darwin/amd64/sys.s
+++ b/src/pkg/runtime/darwin/amd64/sys.s
@@ -11,7 +11,7 @@
#include "amd64/asm.h"
// Exit the entire program (like C exit)
-TEXT exit(SB),7,$-8
+TEXT exit(SB),7,$0
MOVL 8(SP), DI // arg 1 exit status
MOVL $(0x2000000+1), AX // syscall entry
SYSCALL
@@ -20,14 +20,14 @@
// Exit this OS thread (like pthread_exit, which eventually
// calls __bsdthread_terminate).
-TEXT exit1(SB),7,$-8
+TEXT exit1(SB),7,$0
MOVL 8(SP), DI // arg 1 exit status
MOVL $(0x2000000+361), AX // syscall entry
SYSCALL
CALL notok(SB)
RET
-TEXT write(SB),7,$-8
+TEXT write(SB),7,$0
MOVL 8(SP), DI // arg 1 fd
MOVQ 16(SP), SI // arg 2 buf
MOVL 24(SP), DX // arg 3 count
@@ -37,7 +37,7 @@
CALL notok(SB)
RET
-TEXT sigaction(SB),7,$-8
+TEXT sigaction(SB),7,$0
MOVL 8(SP), DI // arg 1 sig
MOVQ 16(SP), SI // arg 2 act
MOVQ 24(SP), DX // arg 3 oact
@@ -63,7 +63,7 @@
SYSCALL
INT $3 // not reached
-TEXT runtime·mmap(SB),7,$-8
+TEXT runtime·mmap(SB),7,$0
MOVQ 8(SP), DI // arg 1 addr
MOVL 16(SP), SI // arg 2 len
MOVL 20(SP), DX // arg 3 prot
@@ -76,12 +76,12 @@
CALL notok(SB)
RET
-TEXT notok(SB),7,$-8
+TEXT notok(SB),7,$0
MOVL $0xf1, BP
MOVQ BP, (BP)
RET
-TEXT runtime·memclr(SB),7,$-8
+TEXT runtime·memclr(SB),7,$0
MOVQ 8(SP), DI // arg 1 addr
MOVL 16(SP), CX // arg 2 count
ADDL $7, CX
@@ -103,7 +103,7 @@
MOVQ BX, -8(AX) // set calling pc
RET
-TEXT sigaltstack(SB),7,$-8
+TEXT sigaltstack(SB),7,$0
MOVQ new+8(SP), DI
MOVQ old+16(SP), SI
MOVQ $(0x2000000+53), AX
@@ -113,7 +113,7 @@
RET
// void bsdthread_create(void *stk, M *m, G *g, void (*fn)(void))
-TEXT bsdthread_create(SB),7,$-8
+TEXT bsdthread_create(SB),7,$0
// Set up arguments to bsdthread_create system call.
// The ones in quotes pass through to the thread callback
// uninterpreted, so we can put whatever we want there.
@@ -139,9 +139,11 @@
// R8 = stack
// R9 = flags (= 0)
// SP = stack - C_64_REDZONE_LEN (= stack - 128)
-TEXT bsdthread_start(SB),7,$-8
+TEXT bsdthread_start(SB),7,$0
+ MOVQ R8, SP // empirically, SP is very wrong but R8 is right
MOVQ CX, m
MOVQ m_g0(m), g
+ CALL stackcheck(SB)
MOVQ SI, m_procid(m) // thread port is m->procid
CALL DX // fn
CALL exit1(SB)
@@ -150,7 +152,7 @@
// void bsdthread_register(void)
// registers callbacks for threadstart (see bsdthread_create above
// and wqthread and pthsize (not used). returns 0 on success.
-TEXT bsdthread_register(SB),7,$-8
+TEXT bsdthread_register(SB),7,$0
MOVQ $bsdthread_start(SB), DI // threadstart
MOVQ $0, SI // wqthread, not used by us
MOVQ $0, DX // pthsize, not used by us
