| // 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 "zasm_GOOS_GOARCH.h" |
| |
| // Exit the entire program (like C exit) |
| TEXT runtime·exit(SB),7,$0 |
| MOVL $1, AX |
| INT $0x80 |
| MOVL $0xf1, 0xf1 // crash |
| 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) |
| MOVL $0xf1, 0xf1 // crash |
| 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·madvise(SB),7,$0 |
| MOVL $75, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·munmap(SB),7,$0 |
| MOVL $73, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·setitimer(SB),7,$0 |
| MOVL $83, AX |
| INT $0x80 |
| RET |
| |
| // func now() (sec int64, nsec int32) |
| TEXT time·now(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 DX, BX |
| |
| // sec is in AX, usec in BX |
| MOVL AX, sec+0(FP) |
| MOVL $0, sec+4(FP) |
| IMULL $1000, BX |
| MOVL BX, nsec+8(FP) |
| RET |
| |
| // int64 nanotime(void) so really |
| // void nanotime(int64 *nsec) |
| TEXT runtime·nanotime(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 DX, BX |
| |
| // sec is in AX, usec in BX |
| // convert to DX:AX nsec |
| MOVL $1000000000, CX |
| MULL CX |
| IMULL $1000, BX |
| ADDL BX, AX |
| ADCL $0, DX |
| |
| MOVL ret+0(FP), DI |
| MOVL AX, 0(DI) |
| MOVL DX, 4(DI) |
| RET |
| |
| TEXT runtime·sigprocmask(SB),7,$0 |
| MOVL $329, AX // pthread_sigmask (on OS X, sigprocmask==entire process) |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·sigaction(SB),7,$0 |
| MOVL $46, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| 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) |
| |
| // check that m exists |
| MOVL m(CX), BP |
| CMPL BP, $0 |
| JNE 2(PC) |
| CALL runtime·badsignal(SB) |
| |
| // save g |
| MOVL g(CX), DI |
| MOVL DI, 20(SP) |
| |
| // g = m->gsignal |
| 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 |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·sigaltstack(SB),7,$0 |
| MOVL $53, AX |
| INT $0x80 |
| JAE 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·usleep(SB),7,$32 |
| MOVL $0, DX |
| MOVL usec+0(FP), AX |
| MOVL $1000000, CX |
| DIVL CX |
| MOVL AX, 24(SP) // sec |
| MOVL DX, 28(SP) // usec |
| |
| // select(0, 0, 0, 0, &tv) |
| MOVL $0, 0(SP) // "return PC" - ignored |
| MOVL $0, 4(SP) |
| MOVL $0, 8(SP) |
| MOVL $0, 12(SP) |
| MOVL $0, 16(SP) |
| LEAL 24(SP), AX |
| MOVL AX, 20(SP) |
| MOVL $93, AX |
| INT $0x80 |
| 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) |
| MOVL $0xf1, 0xf1 // crash |
| 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 cgo/gcc_darwin_386.c:/468 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 |
| |
| TEXT runtime·sysctl(SB),7,$0 |
| MOVL $202, AX |
| INT $0x80 |
| JAE 3(PC) |
| NEGL AX |
| RET |
| MOVL $0, AX |
| RET |
