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author | Tianon Gravi <admwiggin@gmail.com> | 2015-01-15 11:54:00 -0700 |
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committer | Tianon Gravi <admwiggin@gmail.com> | 2015-01-15 11:54:00 -0700 |
commit | f154da9e12608589e8d5f0508f908a0c3e88a1bb (patch) | |
tree | f8255d51e10c6f1e0ed69702200b966c9556a431 /src/runtime/sys_freebsd_386.s | |
parent | 8d8329ed5dfb9622c82a9fbec6fd99a580f9c9f6 (diff) | |
download | golang-f154da9e12608589e8d5f0508f908a0c3e88a1bb.tar.gz |
Imported Upstream version 1.4upstream/1.4
Diffstat (limited to 'src/runtime/sys_freebsd_386.s')
-rw-r--r-- | src/runtime/sys_freebsd_386.s | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/src/runtime/sys_freebsd_386.s b/src/runtime/sys_freebsd_386.s new file mode 100644 index 000000000..2c40fc433 --- /dev/null +++ b/src/runtime/sys_freebsd_386.s @@ -0,0 +1,391 @@ +// 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, FreeBSD +// /usr/src/sys/kern/syscalls.master for syscall numbers. +// + +#include "zasm_GOOS_GOARCH.h" +#include "textflag.h" + +TEXT runtime·sys_umtx_op(SB),NOSPLIT,$-4 + MOVL $454, AX + INT $0x80 + MOVL AX, ret+20(FP) + RET + +TEXT runtime·thr_new(SB),NOSPLIT,$-4 + MOVL $455, AX + INT $0x80 + RET + +TEXT runtime·thr_start(SB),NOSPLIT,$0 + MOVL mm+0(FP), AX + MOVL m_g0(AX), BX + LEAL m_tls(AX), BP + MOVL 0(BP), DI + ADDL $7, DI + PUSHAL + PUSHL $32 + PUSHL BP + PUSHL DI + CALL runtime·setldt(SB) + POPL AX + POPL AX + POPL AX + POPAL + get_tls(CX) + MOVL BX, g(CX) + + MOVL AX, g_m(BX) + CALL runtime·stackcheck(SB) // smashes AX + CALL runtime·mstart(SB) + + MOVL 0, AX // crash (not reached) + +// Exit the entire program (like C exit) +TEXT runtime·exit(SB),NOSPLIT,$-4 + MOVL $1, AX + INT $0x80 + MOVL $0xf1, 0xf1 // crash + RET + +TEXT runtime·exit1(SB),NOSPLIT,$-4 + MOVL $431, AX + INT $0x80 + JAE 2(PC) + MOVL $0xf1, 0xf1 // crash + RET + +TEXT runtime·open(SB),NOSPLIT,$-4 + MOVL $5, AX + INT $0x80 + MOVL AX, ret+12(FP) + RET + +TEXT runtime·close(SB),NOSPLIT,$-4 + MOVL $6, AX + INT $0x80 + MOVL AX, ret+4(FP) + RET + +TEXT runtime·read(SB),NOSPLIT,$-4 + MOVL $3, AX + INT $0x80 + MOVL AX, ret+12(FP) + RET + +TEXT runtime·write(SB),NOSPLIT,$-4 + MOVL $4, AX + INT $0x80 + MOVL AX, ret+12(FP) + RET + +TEXT runtime·getrlimit(SB),NOSPLIT,$-4 + MOVL $194, AX + INT $0x80 + MOVL AX, ret+8(FP) + RET + +TEXT runtime·raise(SB),NOSPLIT,$16 + // thr_self(&8(SP)) + LEAL 8(SP), AX + MOVL AX, 4(SP) + MOVL $432, AX + INT $0x80 + // thr_kill(self, SIGPIPE) + MOVL 8(SP), AX + MOVL AX, 4(SP) + MOVL sig+0(FP), AX + MOVL AX, 8(SP) + MOVL $433, AX + INT $0x80 + RET + +TEXT runtime·mmap(SB),NOSPLIT,$32 + LEAL addr+0(FP), SI + LEAL 4(SP), DI + CLD + MOVSL + MOVSL + MOVSL + MOVSL + MOVSL + MOVSL + MOVL $0, AX // top 32 bits of file offset + STOSL + MOVL $477, AX + INT $0x80 + MOVL AX, ret+24(FP) + RET + +TEXT runtime·munmap(SB),NOSPLIT,$-4 + MOVL $73, AX + INT $0x80 + JAE 2(PC) + MOVL $0xf1, 0xf1 // crash + RET + +TEXT runtime·madvise(SB),NOSPLIT,$-4 + MOVL $75, AX // madvise + INT $0x80 + // ignore failure - maybe pages are locked + RET + +TEXT runtime·setitimer(SB), NOSPLIT, $-4 + MOVL $83, AX + INT $0x80 + RET + +// func now() (sec int64, nsec int32) +TEXT time·now(SB), NOSPLIT, $32 + MOVL $232, AX + LEAL 12(SP), BX + MOVL $0, 4(SP) // CLOCK_REALTIME + MOVL BX, 8(SP) + INT $0x80 + MOVL 12(SP), AX // sec + MOVL 16(SP), BX // nsec + + // sec is in AX, nsec in BX + MOVL AX, sec+0(FP) + MOVL $0, sec+4(FP) + MOVL BX, nsec+8(FP) + RET + +// int64 nanotime(void) so really +// void nanotime(int64 *nsec) +TEXT runtime·nanotime(SB), NOSPLIT, $32 + MOVL $232, AX + LEAL 12(SP), BX + // We can use CLOCK_MONOTONIC_FAST here when we drop + // support for FreeBSD 8-STABLE. + MOVL $4, 4(SP) // CLOCK_MONOTONIC + MOVL BX, 8(SP) + INT $0x80 + MOVL 12(SP), AX // sec + MOVL 16(SP), BX // nsec + + // sec is in AX, nsec in BX + // convert to DX:AX nsec + MOVL $1000000000, CX + MULL CX + ADDL BX, AX + ADCL $0, DX + + MOVL AX, ret_lo+0(FP) + MOVL DX, ret_hi+4(FP) + RET + + +TEXT runtime·sigaction(SB),NOSPLIT,$-4 + MOVL $416, AX + INT $0x80 + JAE 2(PC) + MOVL $0xf1, 0xf1 // crash + RET + +TEXT runtime·sigtramp(SB),NOSPLIT,$44 + get_tls(CX) + + // check that g exists + MOVL g(CX), DI + CMPL DI, $0 + JNE 6(PC) + MOVL signo+0(FP), BX + MOVL BX, 0(SP) + MOVL $runtime·badsignal(SB), AX + CALL AX + JMP sigtramp_ret + + // save g + MOVL DI, 20(SP) + + // g = m->gsignal + MOVL g_m(DI), BX + MOVL m_gsignal(BX), BX + MOVL BX, g(CX) + + // copy arguments for call to sighandler + MOVL signo+0(FP), BX + MOVL BX, 0(SP) + MOVL info+4(FP), BX + MOVL BX, 4(SP) + MOVL context+8(FP), BX + MOVL BX, 8(SP) + MOVL DI, 12(SP) + + CALL runtime·sighandler(SB) + + // restore g + get_tls(CX) + MOVL 20(SP), BX + MOVL BX, g(CX) + +sigtramp_ret: + // call sigreturn + MOVL context+8(FP), AX + MOVL $0, 0(SP) // syscall gap + MOVL AX, 4(SP) + MOVL $417, AX // sigreturn(ucontext) + INT $0x80 + MOVL $0xf1, 0xf1 // crash + RET + +TEXT runtime·sigaltstack(SB),NOSPLIT,$0 + MOVL $53, AX + INT $0x80 + JAE 2(PC) + MOVL $0xf1, 0xf1 // crash + RET + +TEXT runtime·usleep(SB),NOSPLIT,$20 + MOVL $0, DX + MOVL usec+0(FP), AX + MOVL $1000000, CX + DIVL CX + MOVL AX, 12(SP) // tv_sec + MOVL $1000, AX + MULL DX + MOVL AX, 16(SP) // tv_nsec + + MOVL $0, 0(SP) + LEAL 12(SP), AX + MOVL AX, 4(SP) // arg 1 - rqtp + MOVL $0, 8(SP) // arg 2 - rmtp + MOVL $240, AX // sys_nanosleep + INT $0x80 + RET + +/* +descriptor entry format for system call +is the native machine format, ugly as it is: + + 2-byte limit + 3-byte base + 1-byte: 0x80=present, 0x60=dpl<<5, 0x1F=type + 1-byte: 0x80=limit is *4k, 0x40=32-bit operand size, + 0x0F=4 more bits of limit + 1 byte: 8 more bits of base + +int i386_get_ldt(int, union ldt_entry *, int); +int i386_set_ldt(int, const union ldt_entry *, int); + +*/ + +// setldt(int entry, int address, int limit) +TEXT runtime·setldt(SB),NOSPLIT,$32 + MOVL address+4(FP), BX // aka base + // see comment in sys_linux_386.s; freebsd is similar + ADDL $0x8, BX + + // set up data_desc + LEAL 16(SP), AX // struct data_desc + MOVL $0, 0(AX) + MOVL $0, 4(AX) + + MOVW BX, 2(AX) + SHRL $16, BX + MOVB BX, 4(AX) + SHRL $8, BX + MOVB BX, 7(AX) + + MOVW $0xffff, 0(AX) + MOVB $0xCF, 6(AX) // 32-bit operand, 4k limit unit, 4 more bits of limit + + MOVB $0xF2, 5(AX) // r/w data descriptor, dpl=3, present + + // call i386_set_ldt(entry, desc, 1) + MOVL $0xffffffff, 0(SP) // auto-allocate entry and return in AX + MOVL AX, 4(SP) + MOVL $1, 8(SP) + CALL runtime·i386_set_ldt(SB) + + // compute segment selector - (entry*8+7) + SHLL $3, AX + ADDL $7, AX + MOVW AX, GS + RET + +TEXT runtime·i386_set_ldt(SB),NOSPLIT,$16 + LEAL args+0(FP), AX // 0(FP) == 4(SP) before SP got moved + MOVL $0, 0(SP) // syscall gap + MOVL $1, 4(SP) + MOVL AX, 8(SP) + MOVL $165, AX + INT $0x80 + JAE 2(PC) + INT $3 + RET + +TEXT runtime·sysctl(SB),NOSPLIT,$28 + LEAL mib+0(FP), SI + LEAL 4(SP), DI + CLD + MOVSL // arg 1 - name + MOVSL // arg 2 - namelen + MOVSL // arg 3 - oldp + MOVSL // arg 4 - oldlenp + MOVSL // arg 5 - newp + MOVSL // arg 6 - newlen + MOVL $202, AX // sys___sysctl + INT $0x80 + JAE 4(PC) + NEGL AX + MOVL AX, ret+24(FP) + RET + MOVL $0, AX + MOVL AX, ret+24(FP) + RET + +TEXT runtime·osyield(SB),NOSPLIT,$-4 + MOVL $331, AX // sys_sched_yield + INT $0x80 + RET + +TEXT runtime·sigprocmask(SB),NOSPLIT,$16 + MOVL $0, 0(SP) // syscall gap + MOVL $3, 4(SP) // arg 1 - how (SIG_SETMASK) + MOVL new+0(FP), AX + MOVL AX, 8(SP) // arg 2 - set + MOVL old+4(FP), AX + MOVL AX, 12(SP) // arg 3 - oset + MOVL $340, AX // sys_sigprocmask + INT $0x80 + JAE 2(PC) + MOVL $0xf1, 0xf1 // crash + RET + +// int32 runtime·kqueue(void); +TEXT runtime·kqueue(SB),NOSPLIT,$0 + MOVL $362, AX + INT $0x80 + JAE 2(PC) + NEGL AX + MOVL AX, ret+0(FP) + RET + +// int32 runtime·kevent(int kq, Kevent *changelist, int nchanges, Kevent *eventlist, int nevents, Timespec *timeout); +TEXT runtime·kevent(SB),NOSPLIT,$0 + MOVL $363, AX + INT $0x80 + JAE 2(PC) + NEGL AX + MOVL AX, ret+24(FP) + RET + +// int32 runtime·closeonexec(int32 fd); +TEXT runtime·closeonexec(SB),NOSPLIT,$32 + MOVL $92, AX // fcntl + // 0(SP) is where the caller PC would be; kernel skips it + MOVL fd+0(FP), BX + MOVL BX, 4(SP) // fd + MOVL $2, 8(SP) // F_SETFD + MOVL $1, 12(SP) // FD_CLOEXEC + INT $0x80 + JAE 2(PC) + NEGL AX + RET + +GLOBL runtime·tlsoffset(SB),NOPTR,$4 |