| // 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, Linux |
| // |
| |
| #include "zasm_GOOS_GOARCH.h" |
| #include "../../cmd/ld/textflag.h" |
| |
| TEXT runtime·exit(SB),NOSPLIT,$0 |
| MOVL $252, AX // syscall number |
| MOVL 4(SP), BX |
| CALL *runtime·_vdso(SB) |
| INT $3 // not reached |
| RET |
| |
| TEXT runtime·exit1(SB),NOSPLIT,$0 |
| MOVL $1, AX // exit - exit the current os thread |
| MOVL 4(SP), BX |
| CALL *runtime·_vdso(SB) |
| INT $3 // not reached |
| RET |
| |
| TEXT runtime·open(SB),NOSPLIT,$0 |
| MOVL $5, AX // syscall - open |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·close(SB),NOSPLIT,$0 |
| MOVL $6, AX // syscall - close |
| MOVL 4(SP), BX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·write(SB),NOSPLIT,$0 |
| MOVL $4, AX // syscall - write |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·read(SB),NOSPLIT,$0 |
| MOVL $3, AX // syscall - read |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·getrlimit(SB),NOSPLIT,$0 |
| MOVL $191, AX // syscall - ugetrlimit |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·usleep(SB),NOSPLIT,$8 |
| MOVL $0, DX |
| MOVL usec+0(FP), AX |
| MOVL $1000000, CX |
| DIVL CX |
| MOVL AX, 0(SP) |
| MOVL DX, 4(SP) |
| |
| // select(0, 0, 0, 0, &tv) |
| MOVL $142, AX |
| MOVL $0, BX |
| MOVL $0, CX |
| MOVL $0, DX |
| MOVL $0, SI |
| LEAL 0(SP), DI |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·raise(SB),NOSPLIT,$12 |
| MOVL $224, AX // syscall - gettid |
| CALL *runtime·_vdso(SB) |
| MOVL AX, BX // arg 1 tid |
| MOVL sig+0(FP), CX // arg 2 signal |
| MOVL $238, AX // syscall - tkill |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·setitimer(SB),NOSPLIT,$0-24 |
| MOVL $104, AX // syscall - setitimer |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·mincore(SB),NOSPLIT,$0-24 |
| MOVL $218, AX // syscall - mincore |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| // func now() (sec int64, nsec int32) |
| TEXT time·now(SB), NOSPLIT, $32 |
| MOVL $265, AX // syscall - clock_gettime |
| MOVL $0, BX // CLOCK_REALTIME |
| LEAL 8(SP), CX |
| MOVL $0, DX |
| CALL *runtime·_vdso(SB) |
| MOVL 8(SP), AX // sec |
| MOVL 12(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 $265, AX // syscall - clock_gettime |
| MOVL $1, BX // CLOCK_MONOTONIC |
| LEAL 8(SP), CX |
| MOVL $0, DX |
| CALL *runtime·_vdso(SB) |
| MOVL 8(SP), AX // sec |
| MOVL 12(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 ret+0(FP), DI |
| MOVL AX, 0(DI) |
| MOVL DX, 4(DI) |
| RET |
| |
| TEXT runtime·rtsigprocmask(SB),NOSPLIT,$0 |
| MOVL $175, AX // syscall entry |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| MOVL 16(SP), SI |
| CALL *runtime·_vdso(SB) |
| CMPL AX, $0xfffff001 |
| JLS 2(PC) |
| INT $3 |
| RET |
| |
| TEXT runtime·rt_sigaction(SB),NOSPLIT,$0 |
| MOVL $174, AX // syscall - rt_sigaction |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| MOVL 16(SP), SI |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·sigtramp(SB),NOSPLIT,$44 |
| get_tls(CX) |
| |
| // check that m exists |
| MOVL m(CX), BX |
| CMPL BX, $0 |
| JNE 6(PC) |
| MOVL sig+0(FP), BX |
| MOVL BX, 0(SP) |
| MOVL $runtime·badsignal(SB), AX |
| CALL AX |
| RET |
| |
| // save g |
| MOVL g(CX), DI |
| MOVL DI, 20(SP) |
| |
| // g = m->gsignal |
| MOVL m(CX), BX |
| MOVL m_gsignal(BX), BX |
| MOVL BX, g(CX) |
| |
| // copy arguments for call to sighandler |
| MOVL sig+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) |
| |
| RET |
| |
| TEXT runtime·sigreturn(SB),NOSPLIT,$0 |
| MOVL $173, AX // rt_sigreturn |
| // Sigreturn expects same SP as signal handler, |
| // so cannot CALL *runtime._vsdo(SB) here. |
| INT $0x80 |
| INT $3 // not reached |
| RET |
| |
| TEXT runtime·mmap(SB),NOSPLIT,$0 |
| MOVL $192, AX // mmap2 |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| MOVL 16(SP), SI |
| MOVL 20(SP), DI |
| MOVL 24(SP), BP |
| SHRL $12, BP |
| CALL *runtime·_vdso(SB) |
| CMPL AX, $0xfffff001 |
| JLS 3(PC) |
| NOTL AX |
| INCL AX |
| RET |
| |
| TEXT runtime·munmap(SB),NOSPLIT,$0 |
| MOVL $91, AX // munmap |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| CALL *runtime·_vdso(SB) |
| CMPL AX, $0xfffff001 |
| JLS 2(PC) |
| INT $3 |
| RET |
| |
| TEXT runtime·madvise(SB),NOSPLIT,$0 |
| MOVL $219, AX // madvise |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| CALL *runtime·_vdso(SB) |
| // ignore failure - maybe pages are locked |
| RET |
| |
| // int32 futex(int32 *uaddr, int32 op, int32 val, |
| // struct timespec *timeout, int32 *uaddr2, int32 val2); |
| TEXT runtime·futex(SB),NOSPLIT,$0 |
| MOVL $240, AX // futex |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| MOVL 16(SP), SI |
| MOVL 20(SP), DI |
| MOVL 24(SP), BP |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| // int32 clone(int32 flags, void *stack, M *mp, G *gp, void (*fn)(void)); |
| TEXT runtime·clone(SB),NOSPLIT,$0 |
| MOVL $120, AX // clone |
| MOVL flags+4(SP), BX |
| MOVL stack+8(SP), CX |
| MOVL $0, DX // parent tid ptr |
| MOVL $0, DI // child tid ptr |
| |
| // Copy mp, gp, fn off parent stack for use by child. |
| SUBL $16, CX |
| MOVL mm+12(SP), SI |
| MOVL SI, 0(CX) |
| MOVL gg+16(SP), SI |
| MOVL SI, 4(CX) |
| MOVL fn+20(SP), SI |
| MOVL SI, 8(CX) |
| MOVL $1234, 12(CX) |
| |
| // cannot use CALL *runtime·_vdso(SB) here, because |
| // the stack changes during the system call (after |
| // CALL *runtime·_vdso(SB), the child is still using |
| // the parent's stack when executing its RET instruction). |
| INT $0x80 |
| |
| // In parent, return. |
| CMPL AX, $0 |
| JEQ 2(PC) |
| RET |
| |
| // Paranoia: check that SP is as we expect. |
| MOVL 12(SP), BP |
| CMPL BP, $1234 |
| JEQ 2(PC) |
| INT $3 |
| |
| // Initialize AX to Linux tid |
| MOVL $224, AX |
| CALL *runtime·_vdso(SB) |
| |
| // In child on new stack. Reload registers (paranoia). |
| MOVL 0(SP), BX // m |
| MOVL 4(SP), DX // g |
| MOVL 8(SP), SI // fn |
| |
| MOVL AX, m_procid(BX) // save tid as m->procid |
| |
| // set up ldt 7+id to point at m->tls. |
| // newosproc left the id in tls[0]. |
| LEAL m_tls(BX), 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(AX) |
| MOVL DX, g(AX) |
| MOVL BX, m(AX) |
| |
| CALL runtime·stackcheck(SB) // smashes AX, CX |
| MOVL 0(DX), DX // paranoia; check they are not nil |
| MOVL 0(BX), BX |
| |
| // more paranoia; check that stack splitting code works |
| PUSHAL |
| CALL runtime·emptyfunc(SB) |
| POPAL |
| |
| CALL SI // fn() |
| CALL runtime·exit1(SB) |
| MOVL $0x1234, 0x1005 |
| RET |
| |
| TEXT runtime·sigaltstack(SB),NOSPLIT,$-8 |
| MOVL $186, AX // sigaltstack |
| MOVL new+4(SP), BX |
| MOVL old+8(SP), CX |
| CALL *runtime·_vdso(SB) |
| CMPL AX, $0xfffff001 |
| JLS 2(PC) |
| INT $3 |
| RET |
| |
| // <asm-i386/ldt.h> |
| // struct user_desc { |
| // unsigned int entry_number; |
| // unsigned long base_addr; |
| // unsigned int limit; |
| // unsigned int seg_32bit:1; |
| // unsigned int contents:2; |
| // unsigned int read_exec_only:1; |
| // unsigned int limit_in_pages:1; |
| // unsigned int seg_not_present:1; |
| // unsigned int useable:1; |
| // }; |
| #define SEG_32BIT 0x01 |
| // contents are the 2 bits 0x02 and 0x04. |
| #define CONTENTS_DATA 0x00 |
| #define CONTENTS_STACK 0x02 |
| #define CONTENTS_CODE 0x04 |
| #define READ_EXEC_ONLY 0x08 |
| #define LIMIT_IN_PAGES 0x10 |
| #define SEG_NOT_PRESENT 0x20 |
| #define USEABLE 0x40 |
| |
| // setldt(int entry, int address, int limit) |
| TEXT runtime·setldt(SB),NOSPLIT,$32 |
| MOVL entry+0(FP), BX // entry |
| MOVL address+4(FP), CX // base address |
| |
| /* |
| * 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), 4(GS), but -8(GS), -4(GS). |
| * To insulate the rest of the tool chain from this |
| * ugliness, 8l rewrites 0(TLS) into -8(GS) for us. |
| * To accommodate that rewrite, we translate |
| * the address here and bump the limit to 0xffffffff (no limit) |
| * so that -8(GS) maps to 0(address). |
| * Also, the final 0(GS) (current 8(CX)) has to point |
| * to itself, to mimic ELF. |
| */ |
| ADDL $0x8, CX // address |
| MOVL CX, 0(CX) |
| |
| // set up user_desc |
| LEAL 16(SP), AX // struct user_desc |
| MOVL BX, 0(AX) |
| MOVL CX, 4(AX) |
| MOVL $0xfffff, 8(AX) |
| MOVL $(SEG_32BIT|LIMIT_IN_PAGES|USEABLE|CONTENTS_DATA), 12(AX) // flag bits |
| |
| // call modify_ldt |
| MOVL $1, BX // func = 1 (write) |
| MOVL AX, CX // user_desc |
| MOVL $16, DX // sizeof(user_desc) |
| MOVL $123, AX // syscall - modify_ldt |
| CALL *runtime·_vdso(SB) |
| |
| // breakpoint on error |
| CMPL AX, $0xfffff001 |
| JLS 2(PC) |
| INT $3 |
| |
| // compute segment selector - (entry*8+7) |
| MOVL entry+0(FP), AX |
| SHLL $3, AX |
| ADDL $7, AX |
| MOVW AX, GS |
| |
| RET |
| |
| TEXT runtime·osyield(SB),NOSPLIT,$0 |
| MOVL $158, AX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| TEXT runtime·sched_getaffinity(SB),NOSPLIT,$0 |
| MOVL $242, AX // syscall - sched_getaffinity |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| // int32 runtime·epollcreate(int32 size); |
| TEXT runtime·epollcreate(SB),NOSPLIT,$0 |
| MOVL $254, AX |
| MOVL 4(SP), BX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| // int32 runtime·epollcreate1(int32 flags); |
| TEXT runtime·epollcreate1(SB),NOSPLIT,$0 |
| MOVL $329, AX |
| MOVL 4(SP), BX |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| // int32 runtime·epollctl(int32 epfd, int32 op, int32 fd, EpollEvent *ev); |
| TEXT runtime·epollctl(SB),NOSPLIT,$0 |
| MOVL $255, AX |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| MOVL 16(SP), SI |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| // int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout); |
| TEXT runtime·epollwait(SB),NOSPLIT,$0 |
| MOVL $256, AX |
| MOVL 4(SP), BX |
| MOVL 8(SP), CX |
| MOVL 12(SP), DX |
| MOVL 16(SP), SI |
| CALL *runtime·_vdso(SB) |
| RET |
| |
| // void runtime·closeonexec(int32 fd); |
| TEXT runtime·closeonexec(SB),NOSPLIT,$0 |
| MOVL $55, AX // fcntl |
| MOVL 4(SP), BX // fd |
| MOVL $2, CX // F_SETFD |
| MOVL $1, DX // FD_CLOEXEC |
| CALL *runtime·_vdso(SB) |
| RET |