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Diffstat (limited to 'src/pkg/runtime/darwin/386/sys.s')
| -rw-r--r-- | src/pkg/runtime/darwin/386/sys.s | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/src/pkg/runtime/darwin/386/sys.s b/src/pkg/runtime/darwin/386/sys.s new file mode 100644 index 000000000..87fbdbb79 --- /dev/null +++ b/src/pkg/runtime/darwin/386/sys.s @@ -0,0 +1,311 @@ +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// System calls and other sys.stuff for 386, Darwin +// See http://fxr.watson.org/fxr/source/bsd/kern/syscalls.c?v=xnu-1228 +// or /usr/include/sys/syscall.h (on a Mac) for system call numbers. + +#include "386/asm.h" + +TEXT runtime·notok(SB),7,$0 + MOVL $0xf1, 0xf1 + RET + +// Exit the entire program (like C exit) +TEXT runtime·exit(SB),7,$0 + MOVL $1, AX + INT $0x80 + CALL runtime·notok(SB) + RET + +// Exit this OS thread (like pthread_exit, which eventually +// calls __bsdthread_terminate). +TEXT runtime·exit1(SB),7,$0 + MOVL $361, AX + INT $0x80 + JAE 2(PC) + CALL runtime·notok(SB) + RET + +TEXT runtime·write(SB),7,$0 + MOVL $4, AX + INT $0x80 + RET + +TEXT runtime·raisesigpipe(SB),7,$8 + get_tls(CX) + MOVL m(CX), DX + MOVL m_procid(DX), DX + MOVL DX, 0(SP) // thread_port + MOVL $13, 4(SP) // signal: SIGPIPE + MOVL $328, AX // __pthread_kill + INT $0x80 + RET + +TEXT runtime·mmap(SB),7,$0 + MOVL $197, AX + INT $0x80 + RET + +TEXT runtime·munmap(SB),7,$0 + MOVL $73, AX + INT $0x80 + JAE 2(PC) + CALL runtime·notok(SB) + RET + +TEXT runtime·setitimer(SB),7,$0 + MOVL $83, AX + INT $0x80 + RET + +// void gettime(int64 *sec, int32 *usec) +TEXT runtime·gettime(SB), 7, $32 + LEAL 12(SP), AX // must be non-nil, unused + MOVL AX, 4(SP) + MOVL $0, 8(SP) // time zone pointer + MOVL $116, AX + INT $0x80 + + MOVL sec+0(FP), DI + MOVL AX, (DI) + MOVL $0, 4(DI) // zero extend 32 -> 64 + + MOVL usec+4(FP), DI + MOVL DX, (DI) + RET + +TEXT runtime·sigaction(SB),7,$0 + MOVL $46, AX + INT $0x80 + JAE 2(PC) + CALL runtime·notok(SB) + RET + +// Sigtramp's job is to call the actual signal handler. +// It is called with the following arguments on the stack: +// 0(FP) "return address" - ignored +// 4(FP) actual handler +// 8(FP) siginfo style - ignored +// 12(FP) signal number +// 16(FP) siginfo +// 20(FP) context +TEXT runtime·sigtramp(SB),7,$40 + get_tls(CX) + + // save g + MOVL g(CX), DI + MOVL DI, 20(SP) + + // g = m->gsignal + MOVL m(CX), BP + MOVL m_gsignal(BP), BP + MOVL BP, g(CX) + + // copy arguments to sighandler + MOVL sig+8(FP), BX + MOVL BX, 0(SP) + MOVL info+12(FP), BX + MOVL BX, 4(SP) + MOVL context+16(FP), BX + MOVL BX, 8(SP) + MOVL DI, 12(SP) + + MOVL handler+0(FP), BX + CALL BX + + // restore g + get_tls(CX) + MOVL 20(SP), DI + MOVL DI, g(CX) + + // call sigreturn + MOVL context+16(FP), CX + MOVL style+4(FP), BX + MOVL $0, 0(SP) // "caller PC" - ignored + MOVL CX, 4(SP) + MOVL BX, 8(SP) + MOVL $184, AX // sigreturn(ucontext, infostyle) + INT $0x80 + CALL runtime·notok(SB) + RET + +TEXT runtime·sigaltstack(SB),7,$0 + MOVL $53, AX + INT $0x80 + JAE 2(PC) + CALL runtime·notok(SB) + RET + +// void bsdthread_create(void *stk, M *m, G *g, void (*fn)(void)) +// System call args are: func arg stack pthread flags. +TEXT runtime·bsdthread_create(SB),7,$32 + MOVL $360, AX + // 0(SP) is where the caller PC would be; kernel skips it + MOVL func+12(FP), BX + MOVL BX, 4(SP) // func + MOVL mm+4(FP), BX + MOVL BX, 8(SP) // arg + MOVL stk+0(FP), BX + MOVL BX, 12(SP) // stack + MOVL gg+8(FP), BX + MOVL BX, 16(SP) // pthread + MOVL $0x1000000, 20(SP) // flags = PTHREAD_START_CUSTOM + INT $0x80 + JAE 3(PC) + NEGL AX + RET + MOVL $0, AX + RET + +// The thread that bsdthread_create creates starts executing here, +// because we registered this function using bsdthread_register +// at startup. +// AX = "pthread" (= g) +// BX = mach thread port +// CX = "func" (= fn) +// DX = "arg" (= m) +// DI = stack top +// SI = flags (= 0x1000000) +// SP = stack - C_32_STK_ALIGN +TEXT runtime·bsdthread_start(SB),7,$0 + // set up ldt 7+id to point at m->tls. + // m->tls is at m+40. newosproc left + // the m->id in tls[0]. + LEAL m_tls(DX), BP + MOVL 0(BP), DI + ADDL $7, DI // m0 is LDT#7. count up. + // setldt(tls#, &tls, sizeof tls) + PUSHAL // save registers + PUSHL $32 // sizeof tls + PUSHL BP // &tls + PUSHL DI // tls # + CALL runtime·setldt(SB) + POPL AX + POPL AX + POPL AX + POPAL + + // Now segment is established. Initialize m, g. + get_tls(BP) + MOVL AX, g(BP) + MOVL DX, m(BP) + MOVL BX, m_procid(DX) // m->procid = thread port (for debuggers) + CALL runtime·stackcheck(SB) // smashes AX + CALL CX // fn() + CALL runtime·exit1(SB) + RET + +// void bsdthread_register(void) +// registers callbacks for threadstart (see bsdthread_create above +// and wqthread and pthsize (not used). returns 0 on success. +TEXT runtime·bsdthread_register(SB),7,$40 + MOVL $366, AX + // 0(SP) is where kernel expects caller PC; ignored + MOVL $runtime·bsdthread_start(SB), 4(SP) // threadstart + MOVL $0, 8(SP) // wqthread, not used by us + MOVL $0, 12(SP) // pthsize, not used by us + MOVL $0, 16(SP) // dummy_value [sic] + MOVL $0, 20(SP) // targetconc_ptr + MOVL $0, 24(SP) // dispatchqueue_offset + INT $0x80 + JAE 2(PC) + CALL runtime·notok(SB) + RET + +// Invoke Mach system call. +// Assumes system call number in AX, +// caller PC on stack, caller's caller PC next, +// and then the system call arguments. +// +// Can be used for BSD too, but we don't, +// because if you use this interface the BSD +// system call numbers need an extra field +// in the high 16 bits that seems to be the +// argument count in bytes but is not always. +// INT $0x80 works fine for those. +TEXT runtime·sysenter(SB),7,$0 + POPL DX + MOVL SP, CX + BYTE $0x0F; BYTE $0x34; // SYSENTER + // returns to DX with SP set to CX + +TEXT runtime·mach_msg_trap(SB),7,$0 + MOVL $-31, AX + CALL runtime·sysenter(SB) + RET + +TEXT runtime·mach_reply_port(SB),7,$0 + MOVL $-26, AX + CALL runtime·sysenter(SB) + RET + +TEXT runtime·mach_task_self(SB),7,$0 + MOVL $-28, AX + CALL runtime·sysenter(SB) + RET + +// Mach provides trap versions of the semaphore ops, +// instead of requiring the use of RPC. + +// uint32 mach_semaphore_wait(uint32) +TEXT runtime·mach_semaphore_wait(SB),7,$0 + MOVL $-36, AX + CALL runtime·sysenter(SB) + RET + +// uint32 mach_semaphore_timedwait(uint32, uint32, uint32) +TEXT runtime·mach_semaphore_timedwait(SB),7,$0 + MOVL $-38, AX + CALL runtime·sysenter(SB) + RET + +// uint32 mach_semaphore_signal(uint32) +TEXT runtime·mach_semaphore_signal(SB),7,$0 + MOVL $-33, AX + CALL runtime·sysenter(SB) + RET + +// uint32 mach_semaphore_signal_all(uint32) +TEXT runtime·mach_semaphore_signal_all(SB),7,$0 + MOVL $-34, AX + CALL runtime·sysenter(SB) + RET + +// setldt(int entry, int address, int limit) +// entry and limit are ignored. +TEXT runtime·setldt(SB),7,$32 + MOVL address+4(FP), BX // aka base + + /* + * When linking against the system libraries, + * we use its pthread_create and let it set up %gs + * for us. When we do that, the private storage + * we get is not at 0(GS) but at 0x468(GS). + * To insulate the rest of the tool chain from this ugliness, + * 8l rewrites 0(GS) into 0x468(GS) for us. + * To accommodate that rewrite, we translate the + * address and limit here so that 0x468(GS) maps to 0(address). + * + * See ../../../../libcgo/darwin_386.c for the derivation + * of the constant. + */ + SUBL $0x468, BX + + /* + * Must set up as USER_CTHREAD segment because + * Darwin forces that value into %gs for signal handlers, + * and if we don't set one up, we'll get a recursive + * fault trying to get into the signal handler. + * Since we have to set one up anyway, it might as + * well be the value we want. So don't bother with + * i386_set_ldt. + */ + MOVL BX, 4(SP) + MOVL $3, AX // thread_fast_set_cthread_self - machdep call #3 + INT $0x82 // sic: 0x82, not 0x80, for machdep call + + XORL AX, AX + MOVW GS, AX + RET |