| // Copyright 2014 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, SunOS |
| // /usr/include/sys/syscall.h for syscall numbers. |
| // |
| |
| #include "go_asm.h" |
| #include "go_tls.h" |
| #include "textflag.h" |
| |
| // This is needed by asm_amd64.s |
| TEXT runtime·settls(SB),NOSPLIT,$8 |
| RET |
| |
| // void libc_miniterrno(void *(*___errno)(void)); |
| // |
| // Set the TLS errno pointer in M. |
| // |
| // Called using runtime·asmcgocall from os_solaris.c:/minit. |
| // NOT USING GO CALLING CONVENTION. |
| TEXT runtime·miniterrno(SB),NOSPLIT,$0 |
| // asmcgocall will put first argument into DI. |
| CALL DI // SysV ABI so returns in AX |
| get_tls(CX) |
| MOVQ g(CX), BX |
| MOVQ g_m(BX), BX |
| MOVQ AX, (m_mOS+mOS_perrno)(BX) |
| RET |
| |
| // Call a library function with SysV calling conventions. |
| // The called function can take a maximum of 6 INTEGER class arguments, |
| // see |
| // Michael Matz, Jan Hubicka, Andreas Jaeger, and Mark Mitchell |
| // System V Application Binary Interface |
| // AMD64 Architecture Processor Supplement |
| // section 3.2.3. |
| // |
| // Called by runtime·asmcgocall or runtime·cgocall. |
| // NOT USING GO CALLING CONVENTION. |
| TEXT runtime·asmsysvicall6(SB),NOSPLIT,$0 |
| // asmcgocall will put first argument into DI. |
| PUSHQ DI // save for later |
| MOVQ libcall_fn(DI), AX |
| MOVQ libcall_args(DI), R11 |
| MOVQ libcall_n(DI), R10 |
| |
| get_tls(CX) |
| MOVQ g(CX), BX |
| CMPQ BX, $0 |
| JEQ skiperrno1 |
| MOVQ g_m(BX), BX |
| MOVQ (m_mOS+mOS_perrno)(BX), DX |
| CMPQ DX, $0 |
| JEQ skiperrno1 |
| MOVL $0, 0(DX) |
| |
| skiperrno1: |
| CMPQ R11, $0 |
| JEQ skipargs |
| // Load 6 args into correspondent registers. |
| MOVQ 0(R11), DI |
| MOVQ 8(R11), SI |
| MOVQ 16(R11), DX |
| MOVQ 24(R11), CX |
| MOVQ 32(R11), R8 |
| MOVQ 40(R11), R9 |
| skipargs: |
| |
| // Call SysV function |
| CALL AX |
| |
| // Return result |
| POPQ DI |
| MOVQ AX, libcall_r1(DI) |
| MOVQ DX, libcall_r2(DI) |
| |
| get_tls(CX) |
| MOVQ g(CX), BX |
| CMPQ BX, $0 |
| JEQ skiperrno2 |
| MOVQ g_m(BX), BX |
| MOVQ (m_mOS+mOS_perrno)(BX), AX |
| CMPQ AX, $0 |
| JEQ skiperrno2 |
| MOVL 0(AX), AX |
| MOVQ AX, libcall_err(DI) |
| |
| skiperrno2: |
| RET |
| |
| // uint32 tstart_sysvicall(M *newm); |
| TEXT runtime·tstart_sysvicall(SB),NOSPLIT,$0 |
| // DI contains first arg newm |
| MOVQ m_g0(DI), DX // g |
| |
| // Make TLS entries point at g and m. |
| get_tls(BX) |
| MOVQ DX, g(BX) |
| MOVQ DI, g_m(DX) |
| |
| // Layout new m scheduler stack on os stack. |
| MOVQ SP, AX |
| MOVQ AX, (g_stack+stack_hi)(DX) |
| SUBQ $(0x100000), AX // stack size |
| MOVQ AX, (g_stack+stack_lo)(DX) |
| ADDQ $const__StackGuard, AX |
| MOVQ AX, g_stackguard0(DX) |
| MOVQ AX, g_stackguard1(DX) |
| |
| // Someday the convention will be D is always cleared. |
| CLD |
| |
| CALL runtime·stackcheck(SB) // clobbers AX,CX |
| CALL runtime·mstart(SB) |
| |
| XORL AX, AX // return 0 == success |
| MOVL AX, ret+8(FP) |
| RET |
| |
| // Careful, this is called by __sighndlr, a libc function. We must preserve |
| // registers as per AMD 64 ABI. |
| TEXT runtime·sigtramp(SB),NOSPLIT|TOPFRAME,$0 |
| // Note that we are executing on altsigstack here, so we have |
| // more stack available than NOSPLIT would have us believe. |
| // To defeat the linker, we make our own stack frame with |
| // more space: |
| SUBQ $184, SP |
| |
| // save registers |
| MOVQ BX, 32(SP) |
| MOVQ BP, 40(SP) |
| MOVQ R12, 48(SP) |
| MOVQ R13, 56(SP) |
| MOVQ R14, 64(SP) |
| MOVQ R15, 72(SP) |
| |
| get_tls(BX) |
| // check that g exists |
| MOVQ g(BX), R10 |
| CMPQ R10, $0 |
| JNE allgood |
| MOVQ SI, 80(SP) |
| MOVQ DX, 88(SP) |
| LEAQ 80(SP), AX |
| MOVQ DI, 0(SP) |
| MOVQ AX, 8(SP) |
| MOVQ $runtime·badsignal(SB), AX |
| CALL AX |
| JMP exit |
| |
| allgood: |
| // Save m->libcall and m->scratch. We need to do this because we |
| // might get interrupted by a signal in runtime·asmcgocall. |
| |
| // save m->libcall |
| MOVQ g_m(R10), BP |
| LEAQ m_libcall(BP), R11 |
| MOVQ libcall_fn(R11), R10 |
| MOVQ R10, 88(SP) |
| MOVQ libcall_args(R11), R10 |
| MOVQ R10, 96(SP) |
| MOVQ libcall_n(R11), R10 |
| MOVQ R10, 104(SP) |
| MOVQ libcall_r1(R11), R10 |
| MOVQ R10, 168(SP) |
| MOVQ libcall_r2(R11), R10 |
| MOVQ R10, 176(SP) |
| |
| // save m->scratch |
| LEAQ (m_mOS+mOS_scratch)(BP), R11 |
| MOVQ 0(R11), R10 |
| MOVQ R10, 112(SP) |
| MOVQ 8(R11), R10 |
| MOVQ R10, 120(SP) |
| MOVQ 16(R11), R10 |
| MOVQ R10, 128(SP) |
| MOVQ 24(R11), R10 |
| MOVQ R10, 136(SP) |
| MOVQ 32(R11), R10 |
| MOVQ R10, 144(SP) |
| MOVQ 40(R11), R10 |
| MOVQ R10, 152(SP) |
| |
| // save errno, it might be EINTR; stuff we do here might reset it. |
| MOVQ (m_mOS+mOS_perrno)(BP), R10 |
| MOVL 0(R10), R10 |
| MOVQ R10, 160(SP) |
| |
| // prepare call |
| MOVQ DI, 0(SP) |
| MOVQ SI, 8(SP) |
| MOVQ DX, 16(SP) |
| CALL runtime·sigtrampgo(SB) |
| |
| get_tls(BX) |
| MOVQ g(BX), BP |
| MOVQ g_m(BP), BP |
| // restore libcall |
| LEAQ m_libcall(BP), R11 |
| MOVQ 88(SP), R10 |
| MOVQ R10, libcall_fn(R11) |
| MOVQ 96(SP), R10 |
| MOVQ R10, libcall_args(R11) |
| MOVQ 104(SP), R10 |
| MOVQ R10, libcall_n(R11) |
| MOVQ 168(SP), R10 |
| MOVQ R10, libcall_r1(R11) |
| MOVQ 176(SP), R10 |
| MOVQ R10, libcall_r2(R11) |
| |
| // restore scratch |
| LEAQ (m_mOS+mOS_scratch)(BP), R11 |
| MOVQ 112(SP), R10 |
| MOVQ R10, 0(R11) |
| MOVQ 120(SP), R10 |
| MOVQ R10, 8(R11) |
| MOVQ 128(SP), R10 |
| MOVQ R10, 16(R11) |
| MOVQ 136(SP), R10 |
| MOVQ R10, 24(R11) |
| MOVQ 144(SP), R10 |
| MOVQ R10, 32(R11) |
| MOVQ 152(SP), R10 |
| MOVQ R10, 40(R11) |
| |
| // restore errno |
| MOVQ (m_mOS+mOS_perrno)(BP), R11 |
| MOVQ 160(SP), R10 |
| MOVL R10, 0(R11) |
| |
| exit: |
| // restore registers |
| MOVQ 32(SP), BX |
| MOVQ 40(SP), BP |
| MOVQ 48(SP), R12 |
| MOVQ 56(SP), R13 |
| MOVQ 64(SP), R14 |
| MOVQ 72(SP), R15 |
| |
| ADDQ $184, SP |
| RET |
| |
| TEXT runtime·sigfwd(SB),NOSPLIT,$0-32 |
| MOVQ fn+0(FP), AX |
| MOVL sig+8(FP), DI |
| MOVQ info+16(FP), SI |
| MOVQ ctx+24(FP), DX |
| PUSHQ BP |
| MOVQ SP, BP |
| ANDQ $~15, SP // alignment for x86_64 ABI |
| CALL AX |
| MOVQ BP, SP |
| POPQ BP |
| RET |
| |
| // Called from runtime·usleep (Go). Can be called on Go stack, on OS stack, |
| // can also be called in cgo callback path without a g->m. |
| TEXT runtime·usleep1(SB),NOSPLIT,$0 |
| MOVL usec+0(FP), DI |
| MOVQ $usleep2<>(SB), AX // to hide from 6l |
| |
| // Execute call on m->g0. |
| get_tls(R15) |
| CMPQ R15, $0 |
| JE noswitch |
| |
| MOVQ g(R15), R13 |
| CMPQ R13, $0 |
| JE noswitch |
| MOVQ g_m(R13), R13 |
| CMPQ R13, $0 |
| JE noswitch |
| // TODO(aram): do something about the cpu profiler here. |
| |
| MOVQ m_g0(R13), R14 |
| CMPQ g(R15), R14 |
| JNE switch |
| // executing on m->g0 already |
| CALL AX |
| RET |
| |
| switch: |
| // Switch to m->g0 stack and back. |
| MOVQ (g_sched+gobuf_sp)(R14), R14 |
| MOVQ SP, -8(R14) |
| LEAQ -8(R14), SP |
| CALL AX |
| MOVQ 0(SP), SP |
| RET |
| |
| noswitch: |
| // Not a Go-managed thread. Do not switch stack. |
| CALL AX |
| RET |
| |
| // Runs on OS stack. duration (in µs units) is in DI. |
| TEXT usleep2<>(SB),NOSPLIT,$0 |
| LEAQ libc_usleep(SB), AX |
| CALL AX |
| RET |
| |
| // Runs on OS stack, called from runtime·osyield. |
| TEXT runtime·osyield1(SB),NOSPLIT,$0 |
| LEAQ libc_sched_yield(SB), AX |
| CALL AX |
| RET |
