| // 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 AMD64, FreeBSD |
| // /usr/src/sys/kern/syscalls.master for syscall numbers. |
| // |
| |
| #include "zasm_GOOS_GOARCH.h" |
| #include "../../cmd/ld/textflag.h" |
| |
| // FreeBSD 8, FreeBSD 9, and older versions that I have checked |
| // do not restore R10 on exit from a "restarted" system call |
| // if you use the SYSCALL instruction. This means that, for example, |
| // if a signal arrives while the wait4 system call is executing, |
| // the wait4 internally returns ERESTART, which makes the kernel |
| // back up the PC to execute the SYSCALL instruction a second time. |
| // However, since the kernel does not restore R10, the fourth |
| // argument to the system call has been lost. (FreeBSD 9 also fails |
| // to restore the fifth and sixth arguments, R8 and R9, although |
| // some earlier versions did restore those correctly.) |
| // The broken code is in fast_syscall in FreeBSD's amd64/amd64/exception.S. |
| // It restores only DI, SI, DX, AX, and RFLAGS on system call return. |
| // http://fxr.watson.org/fxr/source/amd64/amd64/exception.S?v=FREEBSD91#L399 |
| // |
| // The INT $0x80 system call path (int0x80_syscall in FreeBSD's |
| // amd64/ia32/ia32_exception.S) does not have this problem, |
| // but it expects the third argument in R10. Instead of rewriting |
| // all the assembly in this file, #define SYSCALL to a safe simulation |
| // using INT $0x80. |
| // |
| // INT $0x80 is a little slower than SYSCALL, but correctness wins. |
| // |
| // See golang.org/issue/6372. |
| #define SYSCALL MOVQ R10, CX; INT $0x80 |
| |
| TEXT runtime·sys_umtx_op(SB),NOSPLIT,$0 |
| MOVQ 8(SP), DI |
| MOVL 16(SP), SI |
| MOVL 20(SP), DX |
| MOVQ 24(SP), R10 |
| MOVQ 32(SP), R8 |
| MOVL $454, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·thr_new(SB),NOSPLIT,$0 |
| MOVQ 8(SP), DI |
| MOVQ 16(SP), SI |
| MOVL $455, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·thr_start(SB),NOSPLIT,$0 |
| MOVQ DI, R13 // m |
| |
| // set up FS to point at m->tls |
| LEAQ m_tls(R13), DI |
| CALL runtime·settls(SB) // smashes DI |
| |
| // set up m, g |
| get_tls(CX) |
| MOVQ R13, m(CX) |
| MOVQ m_g0(R13), DI |
| MOVQ DI, g(CX) |
| |
| CALL runtime·stackcheck(SB) |
| CALL runtime·mstart(SB) |
| |
| MOVQ 0, AX // crash (not reached) |
| |
| // Exit the entire program (like C exit) |
| TEXT runtime·exit(SB),NOSPLIT,$-8 |
| MOVL 8(SP), DI // arg 1 exit status |
| MOVL $1, AX |
| SYSCALL |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·exit1(SB),NOSPLIT,$-8 |
| MOVQ 8(SP), DI // arg 1 exit status |
| MOVL $431, AX |
| SYSCALL |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·open(SB),NOSPLIT,$-8 |
| MOVQ 8(SP), DI // arg 1 pathname |
| MOVL 16(SP), SI // arg 2 flags |
| MOVL 20(SP), DX // arg 3 mode |
| MOVL $5, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·close(SB),NOSPLIT,$-8 |
| MOVL 8(SP), DI // arg 1 fd |
| MOVL $6, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·read(SB),NOSPLIT,$-8 |
| MOVL 8(SP), DI // arg 1 fd |
| MOVQ 16(SP), SI // arg 2 buf |
| MOVL 24(SP), DX // arg 3 count |
| MOVL $3, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·write(SB),NOSPLIT,$-8 |
| MOVL 8(SP), DI // arg 1 fd |
| MOVQ 16(SP), SI // arg 2 buf |
| MOVL 24(SP), DX // arg 3 count |
| MOVL $4, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·getrlimit(SB),NOSPLIT,$-8 |
| MOVL 8(SP), DI |
| MOVQ 16(SP), SI |
| MOVL $194, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·raise(SB),NOSPLIT,$16 |
| // thr_self(&8(SP)) |
| LEAQ 8(SP), DI // arg 1 &8(SP) |
| MOVL $432, AX |
| SYSCALL |
| // thr_kill(self, SIGPIPE) |
| MOVQ 8(SP), DI // arg 1 id |
| MOVL sig+0(FP), SI // arg 2 |
| MOVL $433, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·setitimer(SB), NOSPLIT, $-8 |
| MOVL 8(SP), DI |
| MOVQ 16(SP), SI |
| MOVQ 24(SP), DX |
| MOVL $83, AX |
| SYSCALL |
| RET |
| |
| // func now() (sec int64, nsec int32) |
| TEXT time·now(SB), NOSPLIT, $32 |
| MOVL $232, AX |
| MOVQ $0, DI // CLOCK_REALTIME |
| LEAQ 8(SP), SI |
| SYSCALL |
| MOVQ 8(SP), AX // sec |
| MOVQ 16(SP), DX // nsec |
| |
| // sec is in AX, nsec in DX |
| MOVQ AX, sec+0(FP) |
| MOVL DX, nsec+8(FP) |
| RET |
| |
| TEXT runtime·nanotime(SB), NOSPLIT, $32 |
| MOVL $232, AX |
| // We can use CLOCK_MONOTONIC_FAST here when we drop |
| // support for FreeBSD 8-STABLE. |
| MOVQ $4, DI // CLOCK_MONOTONIC |
| LEAQ 8(SP), SI |
| SYSCALL |
| MOVQ 8(SP), AX // sec |
| MOVQ 16(SP), DX // nsec |
| |
| // sec is in AX, nsec in DX |
| // return nsec in AX |
| IMULQ $1000000000, AX |
| ADDQ DX, AX |
| RET |
| |
| TEXT runtime·sigaction(SB),NOSPLIT,$-8 |
| MOVL 8(SP), DI // arg 1 sig |
| MOVQ 16(SP), SI // arg 2 act |
| MOVQ 24(SP), DX // arg 3 oact |
| MOVL $416, AX |
| SYSCALL |
| JCC 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·sigtramp(SB),NOSPLIT,$64 |
| get_tls(BX) |
| |
| // check that m exists |
| MOVQ m(BX), BP |
| CMPQ BP, $0 |
| JNE 5(PC) |
| MOVQ DI, 0(SP) |
| MOVQ $runtime·badsignal(SB), AX |
| CALL AX |
| RET |
| |
| // save g |
| MOVQ g(BX), R10 |
| MOVQ R10, 40(SP) |
| |
| // g = m->signal |
| MOVQ m_gsignal(BP), BP |
| MOVQ BP, g(BX) |
| |
| MOVQ DI, 0(SP) |
| MOVQ SI, 8(SP) |
| MOVQ DX, 16(SP) |
| MOVQ R10, 24(SP) |
| |
| CALL runtime·sighandler(SB) |
| |
| // restore g |
| get_tls(BX) |
| MOVQ 40(SP), R10 |
| MOVQ R10, g(BX) |
| RET |
| |
| TEXT runtime·mmap(SB),NOSPLIT,$0 |
| MOVQ 8(SP), DI // arg 1 addr |
| MOVQ 16(SP), SI // arg 2 len |
| MOVL 24(SP), DX // arg 3 prot |
| MOVL 28(SP), R10 // arg 4 flags |
| MOVL 32(SP), R8 // arg 5 fid |
| MOVL 36(SP), R9 // arg 6 offset |
| MOVL $477, AX |
| SYSCALL |
| RET |
| |
| TEXT runtime·munmap(SB),NOSPLIT,$0 |
| MOVQ 8(SP), DI // arg 1 addr |
| MOVQ 16(SP), SI // arg 2 len |
| MOVL $73, AX |
| SYSCALL |
| JCC 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·madvise(SB),NOSPLIT,$0 |
| MOVQ 8(SP), DI |
| MOVQ 16(SP), SI |
| MOVQ 24(SP), DX |
| MOVQ $75, AX // madvise |
| SYSCALL |
| // ignore failure - maybe pages are locked |
| RET |
| |
| TEXT runtime·sigaltstack(SB),NOSPLIT,$-8 |
| MOVQ new+8(SP), DI |
| MOVQ old+16(SP), SI |
| MOVQ $53, AX |
| SYSCALL |
| JCC 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·usleep(SB),NOSPLIT,$16 |
| MOVL $0, DX |
| MOVL usec+0(FP), AX |
| MOVL $1000000, CX |
| DIVL CX |
| MOVQ AX, 0(SP) // tv_sec |
| MOVL $1000, AX |
| MULL DX |
| MOVQ AX, 8(SP) // tv_nsec |
| |
| MOVQ SP, DI // arg 1 - rqtp |
| MOVQ $0, SI // arg 2 - rmtp |
| MOVL $240, AX // sys_nanosleep |
| SYSCALL |
| RET |
| |
| // set tls base to DI |
| TEXT runtime·settls(SB),NOSPLIT,$8 |
| ADDQ $16, DI // adjust for ELF: wants to use -16(FS) and -8(FS) for g and m |
| MOVQ DI, 0(SP) |
| MOVQ SP, SI |
| MOVQ $129, DI // AMD64_SET_FSBASE |
| MOVQ $165, AX // sysarch |
| SYSCALL |
| JCC 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| TEXT runtime·sysctl(SB),NOSPLIT,$0 |
| MOVQ 8(SP), DI // arg 1 - name |
| MOVL 16(SP), SI // arg 2 - namelen |
| MOVQ 24(SP), DX // arg 3 - oldp |
| MOVQ 32(SP), R10 // arg 4 - oldlenp |
| MOVQ 40(SP), R8 // arg 5 - newp |
| MOVQ 48(SP), R9 // arg 6 - newlen |
| MOVQ $202, AX // sys___sysctl |
| SYSCALL |
| JCC 3(PC) |
| NEGQ AX |
| RET |
| MOVL $0, AX |
| RET |
| |
| TEXT runtime·osyield(SB),NOSPLIT,$-4 |
| MOVL $331, AX // sys_sched_yield |
| SYSCALL |
| RET |
| |
| TEXT runtime·sigprocmask(SB),NOSPLIT,$0 |
| MOVL $3, DI // arg 1 - how (SIG_SETMASK) |
| MOVQ 8(SP), SI // arg 2 - set |
| MOVQ 16(SP), DX // arg 3 - oset |
| MOVL $340, AX // sys_sigprocmask |
| SYSCALL |
| JAE 2(PC) |
| MOVL $0xf1, 0xf1 // crash |
| RET |
| |
| // int32 runtime·kqueue(void); |
| TEXT runtime·kqueue(SB),NOSPLIT,$0 |
| MOVQ $0, DI |
| MOVQ $0, SI |
| MOVQ $0, DX |
| MOVL $362, AX |
| SYSCALL |
| JCC 2(PC) |
| NEGQ AX |
| RET |
| |
| // int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout); |
| TEXT runtime·kevent(SB),NOSPLIT,$0 |
| MOVL 8(SP), DI |
| MOVQ 16(SP), SI |
| MOVL 24(SP), DX |
| MOVQ 32(SP), R10 |
| MOVL 40(SP), R8 |
| MOVQ 48(SP), R9 |
| MOVL $363, AX |
| SYSCALL |
| JCC 2(PC) |
| NEGQ AX |
| RET |
| |
| // void runtime·closeonexec(int32 fd); |
| TEXT runtime·closeonexec(SB),NOSPLIT,$0 |
| MOVL 8(SP), DI // fd |
| MOVQ $2, SI // F_SETFD |
| MOVQ $1, DX // FD_CLOEXEC |
| MOVL $92, AX // fcntl |
| SYSCALL |
| RET |