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Viewing File: sys_solaris_amd64.s
// 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|NOFRAME,$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 $168, SP
// save registers
MOVQ BX, 24(SP)
MOVQ BP, 32(SP)
MOVQ R12, 40(SP)
MOVQ R13, 48(SP)
MOVQ R14, 56(SP)
MOVQ R15, 64(SP)
get_tls(BX)
// check that g exists
MOVQ g(BX), R10
CMPQ R10, $0
JNE allgood
MOVQ SI, 72(SP)
MOVQ DX, 80(SP)
LEAQ 72(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, 72(SP)
MOVQ libcall_args(R11), R10
MOVQ R10, 80(SP)
MOVQ libcall_n(R11), R10
MOVQ R10, 88(SP)
MOVQ libcall_r1(R11), R10
MOVQ R10, 152(SP)
MOVQ libcall_r2(R11), R10
MOVQ R10, 160(SP)
// save m->scratch
LEAQ (m_mOS+mOS_scratch)(BP), R11
MOVQ 0(R11), R10
MOVQ R10, 96(SP)
MOVQ 8(R11), R10
MOVQ R10, 104(SP)
MOVQ 16(R11), R10
MOVQ R10, 112(SP)
MOVQ 24(R11), R10
MOVQ R10, 120(SP)
MOVQ 32(R11), R10
MOVQ R10, 128(SP)
MOVQ 40(R11), R10
MOVQ R10, 136(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, 144(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 72(SP), R10
MOVQ R10, libcall_fn(R11)
MOVQ 80(SP), R10
MOVQ R10, libcall_args(R11)
MOVQ 88(SP), R10
MOVQ R10, libcall_n(R11)
MOVQ 152(SP), R10
MOVQ R10, libcall_r1(R11)
MOVQ 160(SP), R10
MOVQ R10, libcall_r2(R11)
// restore scratch
LEAQ (m_mOS+mOS_scratch)(BP), R11
MOVQ 96(SP), R10
MOVQ R10, 0(R11)
MOVQ 104(SP), R10
MOVQ R10, 8(R11)
MOVQ 112(SP), R10
MOVQ R10, 16(R11)
MOVQ 120(SP), R10
MOVQ R10, 24(R11)
MOVQ 128(SP), R10
MOVQ R10, 32(R11)
MOVQ 136(SP), R10
MOVQ R10, 40(R11)
// restore errno
MOVQ (m_mOS+mOS_perrno)(BP), R11
MOVQ 144(SP), R10
MOVL R10, 0(R11)
exit:
// restore registers
MOVQ 24(SP), BX
MOVQ 32(SP), BP
MOVQ 40(SP), R12
MOVQ 48(SP), R13
MOVQ 56(SP), R14
MOVQ 64(SP), R15
ADDQ $168, 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
MOVQ SP, BX // callee-saved
ANDQ $~15, SP // alignment for x86_64 ABI
CALL AX
MOVQ BX, SP
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
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