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author | Ondřej Surý <ondrej@sury.org> | 2011-09-13 13:13:40 +0200 |
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committer | Ondřej Surý <ondrej@sury.org> | 2011-09-13 13:13:40 +0200 |
commit | 5ff4c17907d5b19510a62e08fd8d3b11e62b431d (patch) | |
tree | c0650497e988f47be9c6f2324fa692a52dea82e1 /src/pkg/runtime/darwin/386 | |
parent | 80f18fc933cf3f3e829c5455a1023d69f7b86e52 (diff) | |
download | golang-upstream/60.tar.gz |
Imported Upstream version 60upstream/60
Diffstat (limited to 'src/pkg/runtime/darwin/386')
-rw-r--r-- | src/pkg/runtime/darwin/386/defs.h | 289 | ||||
-rw-r--r-- | src/pkg/runtime/darwin/386/rt0.s | 8 | ||||
-rw-r--r-- | src/pkg/runtime/darwin/386/signal.c | 194 | ||||
-rw-r--r-- | src/pkg/runtime/darwin/386/sys.s | 311 |
4 files changed, 802 insertions, 0 deletions
diff --git a/src/pkg/runtime/darwin/386/defs.h b/src/pkg/runtime/darwin/386/defs.h new file mode 100644 index 000000000..bb70207fd --- /dev/null +++ b/src/pkg/runtime/darwin/386/defs.h @@ -0,0 +1,289 @@ +// godefs -f -m32 defs.c + +// MACHINE GENERATED - DO NOT EDIT. + +// Constants +enum { + PROT_NONE = 0, + PROT_READ = 0x1, + PROT_WRITE = 0x2, + PROT_EXEC = 0x4, + MAP_ANON = 0x1000, + MAP_PRIVATE = 0x2, + MAP_FIXED = 0x10, + MACH_MSG_TYPE_MOVE_RECEIVE = 0x10, + MACH_MSG_TYPE_MOVE_SEND = 0x11, + MACH_MSG_TYPE_MOVE_SEND_ONCE = 0x12, + MACH_MSG_TYPE_COPY_SEND = 0x13, + MACH_MSG_TYPE_MAKE_SEND = 0x14, + MACH_MSG_TYPE_MAKE_SEND_ONCE = 0x15, + MACH_MSG_TYPE_COPY_RECEIVE = 0x16, + MACH_MSG_PORT_DESCRIPTOR = 0, + MACH_MSG_OOL_DESCRIPTOR = 0x1, + MACH_MSG_OOL_PORTS_DESCRIPTOR = 0x2, + MACH_MSG_OOL_VOLATILE_DESCRIPTOR = 0x3, + MACH_MSGH_BITS_COMPLEX = 0x80000000, + MACH_SEND_MSG = 0x1, + MACH_RCV_MSG = 0x2, + MACH_RCV_LARGE = 0x4, + MACH_SEND_TIMEOUT = 0x10, + MACH_SEND_INTERRUPT = 0x40, + MACH_SEND_CANCEL = 0x80, + MACH_SEND_ALWAYS = 0x10000, + MACH_SEND_TRAILER = 0x20000, + MACH_RCV_TIMEOUT = 0x100, + MACH_RCV_NOTIFY = 0x200, + MACH_RCV_INTERRUPT = 0x400, + MACH_RCV_OVERWRITE = 0x1000, + NDR_PROTOCOL_2_0 = 0, + NDR_INT_BIG_ENDIAN = 0, + NDR_INT_LITTLE_ENDIAN = 0x1, + NDR_FLOAT_IEEE = 0, + NDR_CHAR_ASCII = 0, + SA_SIGINFO = 0x40, + SA_RESTART = 0x2, + SA_ONSTACK = 0x1, + SA_USERTRAMP = 0x100, + SA_64REGSET = 0x200, + SIGHUP = 0x1, + SIGINT = 0x2, + SIGQUIT = 0x3, + SIGILL = 0x4, + SIGTRAP = 0x5, + SIGABRT = 0x6, + SIGEMT = 0x7, + SIGFPE = 0x8, + SIGKILL = 0x9, + SIGBUS = 0xa, + SIGSEGV = 0xb, + SIGSYS = 0xc, + SIGPIPE = 0xd, + SIGALRM = 0xe, + SIGTERM = 0xf, + SIGURG = 0x10, + SIGSTOP = 0x11, + SIGTSTP = 0x12, + SIGCONT = 0x13, + SIGCHLD = 0x14, + SIGTTIN = 0x15, + SIGTTOU = 0x16, + SIGIO = 0x17, + SIGXCPU = 0x18, + SIGXFSZ = 0x19, + SIGVTALRM = 0x1a, + SIGPROF = 0x1b, + SIGWINCH = 0x1c, + SIGINFO = 0x1d, + SIGUSR1 = 0x1e, + SIGUSR2 = 0x1f, + FPE_INTDIV = 0x7, + FPE_INTOVF = 0x8, + FPE_FLTDIV = 0x1, + FPE_FLTOVF = 0x2, + FPE_FLTUND = 0x3, + FPE_FLTRES = 0x4, + FPE_FLTINV = 0x5, + FPE_FLTSUB = 0x6, + BUS_ADRALN = 0x1, + BUS_ADRERR = 0x2, + BUS_OBJERR = 0x3, + SEGV_MAPERR = 0x1, + SEGV_ACCERR = 0x2, + ITIMER_REAL = 0, + ITIMER_VIRTUAL = 0x1, + ITIMER_PROF = 0x2, +}; + +// Types +#pragma pack on + +typedef struct MachBody MachBody; +struct MachBody { + uint32 msgh_descriptor_count; +}; + +typedef struct MachHeader MachHeader; +struct MachHeader { + uint32 msgh_bits; + uint32 msgh_size; + uint32 msgh_remote_port; + uint32 msgh_local_port; + uint32 msgh_reserved; + int32 msgh_id; +}; + +typedef struct MachNDR MachNDR; +struct MachNDR { + uint8 mig_vers; + uint8 if_vers; + uint8 reserved1; + uint8 mig_encoding; + uint8 int_rep; + uint8 char_rep; + uint8 float_rep; + uint8 reserved2; +}; + +typedef struct MachPort MachPort; +struct MachPort { + uint32 name; + uint32 pad1; + uint16 pad2; + uint8 disposition; + uint8 type; +}; + +typedef struct StackT StackT; +struct StackT { + void *ss_sp; + uint32 ss_size; + int32 ss_flags; +}; + +typedef union Sighandler Sighandler; +union Sighandler { + uint32 __sa_handler; + uint32 __sa_sigaction; +}; + +typedef struct Sigaction Sigaction; +struct Sigaction { + Sighandler __sigaction_u; + uint32 sa_tramp; + uint32 sa_mask; + int32 sa_flags; +}; + +typedef union Sigval Sigval; +union Sigval { + int32 sival_int; + void *sival_ptr; +}; + +typedef struct Siginfo Siginfo; +struct Siginfo { + int32 si_signo; + int32 si_errno; + int32 si_code; + int32 si_pid; + uint32 si_uid; + int32 si_status; + void *si_addr; + Sigval si_value; + int32 si_band; + uint32 __pad[7]; +}; + +typedef struct Timeval Timeval; +struct Timeval { + int32 tv_sec; + int32 tv_usec; +}; + +typedef struct Itimerval Itimerval; +struct Itimerval { + Timeval it_interval; + Timeval it_value; +}; + +typedef struct FPControl FPControl; +struct FPControl { + byte pad_godefs_0[2]; +}; + +typedef struct FPStatus FPStatus; +struct FPStatus { + byte pad_godefs_0[2]; +}; + +typedef struct RegMMST RegMMST; +struct RegMMST { + int8 mmst_reg[10]; + int8 mmst_rsrv[6]; +}; + +typedef struct RegXMM RegXMM; +struct RegXMM { + int8 xmm_reg[16]; +}; + +typedef struct Regs Regs; +struct Regs { + uint32 eax; + uint32 ebx; + uint32 ecx; + uint32 edx; + uint32 edi; + uint32 esi; + uint32 ebp; + uint32 esp; + uint32 ss; + uint32 eflags; + uint32 eip; + uint32 cs; + uint32 ds; + uint32 es; + uint32 fs; + uint32 gs; +}; + +typedef struct FloatState FloatState; +struct FloatState { + uint64 fpu_reserved; + FPControl fpu_fcw; + FPStatus fpu_fsw; + uint8 fpu_ftw; + uint8 fpu_rsrv1; + uint16 fpu_fop; + uint32 fpu_ip; + uint16 fpu_cs; + uint16 fpu_rsrv2; + uint32 fpu_dp; + uint16 fpu_ds; + uint16 fpu_rsrv3; + uint32 fpu_mxcsr; + uint32 fpu_mxcsrmask; + RegMMST fpu_stmm0; + RegMMST fpu_stmm1; + RegMMST fpu_stmm2; + RegMMST fpu_stmm3; + RegMMST fpu_stmm4; + RegMMST fpu_stmm5; + RegMMST fpu_stmm6; + RegMMST fpu_stmm7; + RegXMM fpu_xmm0; + RegXMM fpu_xmm1; + RegXMM fpu_xmm2; + RegXMM fpu_xmm3; + RegXMM fpu_xmm4; + RegXMM fpu_xmm5; + RegXMM fpu_xmm6; + RegXMM fpu_xmm7; + int8 fpu_rsrv4[224]; + int32 fpu_reserved1; +}; + +typedef struct ExceptionState ExceptionState; +struct ExceptionState { + uint32 trapno; + uint32 err; + uint32 faultvaddr; +}; + +typedef struct Mcontext Mcontext; +struct Mcontext { + ExceptionState es; + Regs ss; + FloatState fs; +}; + +typedef struct Ucontext Ucontext; +struct Ucontext { + int32 uc_onstack; + uint32 uc_sigmask; + StackT uc_stack; + uint32 uc_link; + uint32 uc_mcsize; + Mcontext *uc_mcontext; +}; +#pragma pack off diff --git a/src/pkg/runtime/darwin/386/rt0.s b/src/pkg/runtime/darwin/386/rt0.s new file mode 100644 index 000000000..30b497f5e --- /dev/null +++ b/src/pkg/runtime/darwin/386/rt0.s @@ -0,0 +1,8 @@ +// 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. + +// Darwin and Linux use the same linkage to main + +TEXT _rt0_386_darwin(SB),7,$0 + JMP _rt0_386(SB) diff --git a/src/pkg/runtime/darwin/386/signal.c b/src/pkg/runtime/darwin/386/signal.c new file mode 100644 index 000000000..29170b669 --- /dev/null +++ b/src/pkg/runtime/darwin/386/signal.c @@ -0,0 +1,194 @@ +// 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. + +#include "runtime.h" +#include "defs.h" +#include "os.h" +#include "signals.h" + +void +runtime·dumpregs(Regs *r) +{ + runtime·printf("eax %x\n", r->eax); + runtime·printf("ebx %x\n", r->ebx); + runtime·printf("ecx %x\n", r->ecx); + runtime·printf("edx %x\n", r->edx); + runtime·printf("edi %x\n", r->edi); + runtime·printf("esi %x\n", r->esi); + runtime·printf("ebp %x\n", r->ebp); + runtime·printf("esp %x\n", r->esp); + runtime·printf("eip %x\n", r->eip); + runtime·printf("eflags %x\n", r->eflags); + runtime·printf("cs %x\n", r->cs); + runtime·printf("fs %x\n", r->fs); + runtime·printf("gs %x\n", r->gs); +} + +String +runtime·signame(int32 sig) +{ + if(sig < 0 || sig >= NSIG) + return runtime·emptystring; + return runtime·gostringnocopy((byte*)runtime·sigtab[sig].name); +} + +void +runtime·sighandler(int32 sig, Siginfo *info, void *context, G *gp) +{ + Ucontext *uc; + Mcontext *mc; + Regs *r; + uintptr *sp; + byte *pc; + + uc = context; + mc = uc->uc_mcontext; + r = &mc->ss; + + if(sig == SIGPROF) { + runtime·sigprof((uint8*)r->eip, (uint8*)r->esp, nil, gp); + return; + } + + if(gp != nil && (runtime·sigtab[sig].flags & SigPanic)) { + // Work around Leopard bug that doesn't set FPE_INTDIV. + // Look at instruction to see if it is a divide. + // Not necessary in Snow Leopard (si_code will be != 0). + if(sig == SIGFPE && info->si_code == 0) { + pc = (byte*)r->eip; + if(pc[0] == 0x66) // 16-bit instruction prefix + pc++; + if(pc[0] == 0xF6 || pc[0] == 0xF7) + info->si_code = FPE_INTDIV; + } + + // Make it look like a call to the signal func. + // Have to pass arguments out of band since + // augmenting the stack frame would break + // the unwinding code. + gp->sig = sig; + gp->sigcode0 = info->si_code; + gp->sigcode1 = (uintptr)info->si_addr; + gp->sigpc = r->eip; + + // Only push runtime·sigpanic if r->eip != 0. + // If r->eip == 0, probably panicked because of a + // call to a nil func. Not pushing that onto sp will + // make the trace look like a call to runtime·sigpanic instead. + // (Otherwise the trace will end at runtime·sigpanic and we + // won't get to see who faulted.) + if(r->eip != 0) { + sp = (uintptr*)r->esp; + *--sp = r->eip; + r->esp = (uintptr)sp; + } + r->eip = (uintptr)runtime·sigpanic; + return; + } + + if(runtime·sigtab[sig].flags & SigQueue) { + if(runtime·sigsend(sig) || (runtime·sigtab[sig].flags & SigIgnore)) + return; + runtime·exit(2); // SIGINT, SIGTERM, etc + } + + if(runtime·panicking) // traceback already printed + runtime·exit(2); + runtime·panicking = 1; + + if(sig < 0 || sig >= NSIG){ + runtime·printf("Signal %d\n", sig); + }else{ + runtime·printf("%s\n", runtime·sigtab[sig].name); + } + + runtime·printf("pc: %x\n", r->eip); + runtime·printf("\n"); + + if(runtime·gotraceback()){ + runtime·traceback((void*)r->eip, (void*)r->esp, 0, gp); + runtime·tracebackothers(gp); + runtime·dumpregs(r); + } + + runtime·exit(2); +} + +void +runtime·sigignore(int32, Siginfo*, void*) +{ +} + +void +runtime·signalstack(byte *p, int32 n) +{ + StackT st; + + st.ss_sp = p; + st.ss_size = n; + st.ss_flags = 0; + runtime·sigaltstack(&st, nil); +} + +static void +sigaction(int32 i, void (*fn)(int32, Siginfo*, void*, G*), bool restart) +{ + Sigaction sa; + + runtime·memclr((byte*)&sa, sizeof sa); + sa.sa_flags = SA_SIGINFO|SA_ONSTACK; + if(restart) + sa.sa_flags |= SA_RESTART; + sa.sa_mask = ~0U; + sa.sa_tramp = (uintptr)runtime·sigtramp; // runtime·sigtramp's job is to call into real handler + sa.__sigaction_u.__sa_sigaction = (uintptr)fn; + runtime·sigaction(i, &sa, nil); +} + +void +runtime·initsig(int32 queue) +{ + int32 i; + void *fn; + + runtime·siginit(); + + for(i = 0; i<NSIG; i++) { + if(runtime·sigtab[i].flags) { + if((runtime·sigtab[i].flags & SigQueue) != queue) + continue; + if(runtime·sigtab[i].flags & (SigCatch | SigQueue)) + fn = runtime·sighandler; + else + fn = runtime·sigignore; + sigaction(i, fn, (runtime·sigtab[i].flags & SigRestart) != 0); + } + } +} + +void +runtime·resetcpuprofiler(int32 hz) +{ + Itimerval it; + + runtime·memclr((byte*)&it, sizeof it); + if(hz == 0) { + runtime·setitimer(ITIMER_PROF, &it, nil); + sigaction(SIGPROF, SIG_IGN, true); + } else { + sigaction(SIGPROF, runtime·sighandler, true); + it.it_interval.tv_sec = 0; + it.it_interval.tv_usec = 1000000 / hz; + it.it_value = it.it_interval; + runtime·setitimer(ITIMER_PROF, &it, nil); + } + m->profilehz = hz; +} + +void +os·sigpipe(void) +{ + sigaction(SIGPIPE, SIG_DFL, false); + runtime·raisesigpipe(); +} 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 |