/
asm_wasm.s
471 lines (403 loc) · 9.29 KB
/
asm_wasm.s
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// Copyright 2018 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.
#include "go_asm.h"
#include "go_tls.h"
#include "funcdata.h"
#include "textflag.h"
TEXT runtime·rt0_go(SB), NOSPLIT, $0
// save m->g0 = g0
MOVD $runtime·g0(SB), runtime·m0+m_g0(SB)
// save m0 to g0->m
MOVD $runtime·m0(SB), runtime·g0+g_m(SB)
// set g to g0
MOVD $runtime·g0(SB), g
CALLNORESUME runtime·check(SB)
CALLNORESUME runtime·args(SB)
CALLNORESUME runtime·osinit(SB)
CALLNORESUME runtime·schedinit(SB)
MOVD $0, 0(SP)
MOVD $runtime·mainPC(SB), 8(SP)
CALLNORESUME runtime·newproc(SB)
CALL runtime·mstart(SB) // WebAssembly stack will unwind when switching to another goroutine
UNDEF
DATA runtime·mainPC+0(SB)/8,$runtime·main(SB)
GLOBL runtime·mainPC(SB),RODATA,$8
// func checkASM() bool
TEXT ·checkASM(SB), NOSPLIT, $0-1
MOVB $1, ret+0(FP)
RET
TEXT runtime·gogo(SB), NOSPLIT, $0-8
MOVD buf+0(FP), R0
MOVD gobuf_g(R0), g
MOVD gobuf_sp(R0), SP
I64Load gobuf_pc(R0)
I32WrapI64
I32Const $16
I32ShrU
Set PC_F
I64Load gobuf_pc(R0)
I64Const $0xFFFF
I64And
I32WrapI64
Set PC_B
MOVD gobuf_ret(R0), RET0
MOVD gobuf_ctxt(R0), CTXT
// clear to help garbage collector
MOVD $0, gobuf_sp(R0)
MOVD $0, gobuf_ret(R0)
MOVD $0, gobuf_ctxt(R0)
I32Const $1
Return
// func mcall(fn func(*g))
// Switch to m->g0's stack, call fn(g).
// Fn must never return. It should gogo(&g->sched)
// to keep running g.
TEXT runtime·mcall(SB), NOSPLIT, $0-8
// CTXT = fn
MOVD fn+0(FP), CTXT
// R1 = g.m
MOVD g_m(g), R1
// R2 = g0
MOVD m_g0(R1), R2
// save state in g->sched
MOVD 0(SP), g_sched+gobuf_pc(g) // caller's PC
MOVD $fn+0(FP), g_sched+gobuf_sp(g) // caller's SP
MOVD g, g_sched+gobuf_g(g)
// if g == g0 call badmcall
Get g
Get R2
I64Eq
If
JMP runtime·badmcall(SB)
End
// switch to g0's stack
I64Load (g_sched+gobuf_sp)(R2)
I64Const $8
I64Sub
I32WrapI64
Set SP
// set arg to current g
MOVD g, 0(SP)
// switch to g0
MOVD R2, g
// call fn
Get CTXT
I32WrapI64
I64Load $0
CALL
Get SP
I32Const $8
I32Add
Set SP
JMP runtime·badmcall2(SB)
// func systemstack(fn func())
TEXT runtime·systemstack(SB), NOSPLIT, $0-8
// R0 = fn
MOVD fn+0(FP), R0
// R1 = g.m
MOVD g_m(g), R1
// R2 = g0
MOVD m_g0(R1), R2
// if g == g0
Get g
Get R2
I64Eq
If
// no switch:
MOVD R0, CTXT
Get CTXT
I32WrapI64
I64Load $0
JMP
End
// if g != m.curg
Get g
I64Load m_curg(R1)
I64Ne
If
CALLNORESUME runtime·badsystemstack(SB)
End
// switch:
// save state in g->sched. Pretend to
// be systemstack_switch if the G stack is scanned.
MOVD $runtime·systemstack_switch(SB), g_sched+gobuf_pc(g)
MOVD SP, g_sched+gobuf_sp(g)
MOVD g, g_sched+gobuf_g(g)
// switch to g0
MOVD R2, g
// make it look like mstart called systemstack on g0, to stop traceback
I64Load (g_sched+gobuf_sp)(R2)
I64Const $8
I64Sub
Set R3
MOVD $runtime·mstart(SB), 0(R3)
MOVD R3, SP
// call fn
MOVD R0, CTXT
Get CTXT
I32WrapI64
I64Load $0
CALL
// switch back to g
MOVD g_m(g), R1
MOVD m_curg(R1), R2
MOVD R2, g
MOVD g_sched+gobuf_sp(R2), SP
MOVD $0, g_sched+gobuf_sp(R2)
RET
TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0
RET
TEXT runtime·return0(SB), NOSPLIT, $0-0
MOVD $0, RET0
RET
TEXT runtime·jmpdefer(SB), NOSPLIT, $0-16
MOVD fv+0(FP), CTXT
Get CTXT
I64Eqz
If
CALLNORESUME runtime·sigpanic(SB)
End
// caller sp after CALL
I64Load argp+8(FP)
I64Const $8
I64Sub
I32WrapI64
Set SP
// decrease PC_B by 1 to CALL again
Get SP
I32Load16U (SP)
I32Const $1
I32Sub
I32Store16 $0
// but first run the deferred function
Get CTXT
I32WrapI64
I64Load $0
JMP
TEXT runtime·asminit(SB), NOSPLIT, $0-0
// No per-thread init.
RET
TEXT ·publicationBarrier(SB), NOSPLIT, $0-0
RET
TEXT runtime·procyield(SB), NOSPLIT, $0-0 // FIXME
RET
TEXT runtime·breakpoint(SB), NOSPLIT, $0-0
UNDEF
// Called during function prolog when more stack is needed.
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must
// record an argument size. For that purpose, it has no arguments.
TEXT runtime·morestack(SB), NOSPLIT, $0-0
// R1 = g.m
MOVD g_m(g), R1
// R2 = g0
MOVD m_g0(R1), R2
// Cannot grow scheduler stack (m->g0).
Get g
Get R1
I64Eq
If
CALLNORESUME runtime·badmorestackg0(SB)
End
// Cannot grow signal stack (m->gsignal).
Get g
I64Load m_gsignal(R1)
I64Eq
If
CALLNORESUME runtime·badmorestackgsignal(SB)
End
// Called from f.
// Set m->morebuf to f's caller.
MOVD 8(SP), m_morebuf+gobuf_pc(R1)
MOVD $16(SP), m_morebuf+gobuf_sp(R1) // f's caller's SP
MOVD g, m_morebuf+gobuf_g(R1)
// Set g->sched to context in f.
MOVD 0(SP), g_sched+gobuf_pc(g)
MOVD g, g_sched+gobuf_g(g)
MOVD $8(SP), g_sched+gobuf_sp(g) // f's SP
MOVD CTXT, g_sched+gobuf_ctxt(g)
// Call newstack on m->g0's stack.
MOVD R2, g
MOVD g_sched+gobuf_sp(R2), SP
CALL runtime·newstack(SB)
UNDEF // crash if newstack returns
// morestack but not preserving ctxt.
TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0
MOVD $0, CTXT
JMP runtime·morestack(SB)
TEXT ·asmcgocall(SB), NOSPLIT, $0-0
UNDEF
TEXT ·cgocallback_gofunc(SB), NOSPLIT, $16-32
UNDEF
#define DISPATCH(NAME, MAXSIZE) \
Get R0; \
I64Const $MAXSIZE; \
I64LeU; \
If; \
JMP NAME(SB); \
End
TEXT reflect·call(SB), NOSPLIT, $0-0
JMP ·reflectcall(SB)
TEXT ·reflectcall(SB), NOSPLIT, $0-32
I64Load fn+8(FP)
I64Eqz
If
CALLNORESUME runtime·sigpanic(SB)
End
MOVW argsize+24(FP), R0
DISPATCH(runtime·call32, 32)
DISPATCH(runtime·call64, 64)
DISPATCH(runtime·call128, 128)
DISPATCH(runtime·call256, 256)
DISPATCH(runtime·call512, 512)
DISPATCH(runtime·call1024, 1024)
DISPATCH(runtime·call2048, 2048)
DISPATCH(runtime·call4096, 4096)
DISPATCH(runtime·call8192, 8192)
DISPATCH(runtime·call16384, 16384)
DISPATCH(runtime·call32768, 32768)
DISPATCH(runtime·call65536, 65536)
DISPATCH(runtime·call131072, 131072)
DISPATCH(runtime·call262144, 262144)
DISPATCH(runtime·call524288, 524288)
DISPATCH(runtime·call1048576, 1048576)
DISPATCH(runtime·call2097152, 2097152)
DISPATCH(runtime·call4194304, 4194304)
DISPATCH(runtime·call8388608, 8388608)
DISPATCH(runtime·call16777216, 16777216)
DISPATCH(runtime·call33554432, 33554432)
DISPATCH(runtime·call67108864, 67108864)
DISPATCH(runtime·call134217728, 134217728)
DISPATCH(runtime·call268435456, 268435456)
DISPATCH(runtime·call536870912, 536870912)
DISPATCH(runtime·call1073741824, 1073741824)
JMP runtime·badreflectcall(SB)
#define CALLFN(NAME, MAXSIZE) \
TEXT NAME(SB), WRAPPER, $MAXSIZE-32; \
NO_LOCAL_POINTERS; \
MOVW argsize+24(FP), R0; \
\
Get R0; \
I64Eqz; \
Not; \
If; \
Get SP; \
I64Load argptr+16(FP); \
I32WrapI64; \
I64Load argsize+24(FP); \
I64Const $3; \
I64ShrU; \
I32WrapI64; \
Call runtime·wasmMove(SB); \
End; \
\
MOVD f+8(FP), CTXT; \
Get CTXT; \
I32WrapI64; \
I64Load $0; \
CALL; \
\
I64Load32U retoffset+28(FP); \
Set R0; \
\
MOVD argtype+0(FP), RET0; \
\
I64Load argptr+16(FP); \
Get R0; \
I64Add; \
Set RET1; \
\
Get SP; \
I64ExtendUI32; \
Get R0; \
I64Add; \
Set RET2; \
\
I64Load32U argsize+24(FP); \
Get R0; \
I64Sub; \
Set RET3; \
\
CALL callRet<>(SB); \
RET
// callRet copies return values back at the end of call*. This is a
// separate function so it can allocate stack space for the arguments
// to reflectcallmove. It does not follow the Go ABI; it expects its
// arguments in registers.
TEXT callRet<>(SB), NOSPLIT, $32-0
NO_LOCAL_POINTERS
MOVD RET0, 0(SP)
MOVD RET1, 8(SP)
MOVD RET2, 16(SP)
MOVD RET3, 24(SP)
CALL runtime·reflectcallmove(SB)
RET
CALLFN(·call32, 32)
CALLFN(·call64, 64)
CALLFN(·call128, 128)
CALLFN(·call256, 256)
CALLFN(·call512, 512)
CALLFN(·call1024, 1024)
CALLFN(·call2048, 2048)
CALLFN(·call4096, 4096)
CALLFN(·call8192, 8192)
CALLFN(·call16384, 16384)
CALLFN(·call32768, 32768)
CALLFN(·call65536, 65536)
CALLFN(·call131072, 131072)
CALLFN(·call262144, 262144)
CALLFN(·call524288, 524288)
CALLFN(·call1048576, 1048576)
CALLFN(·call2097152, 2097152)
CALLFN(·call4194304, 4194304)
CALLFN(·call8388608, 8388608)
CALLFN(·call16777216, 16777216)
CALLFN(·call33554432, 33554432)
CALLFN(·call67108864, 67108864)
CALLFN(·call134217728, 134217728)
CALLFN(·call268435456, 268435456)
CALLFN(·call536870912, 536870912)
CALLFN(·call1073741824, 1073741824)
TEXT runtime·goexit(SB), NOSPLIT, $0-0
NOP // first PC of goexit is skipped
CALL runtime·goexit1(SB) // does not return
UNDEF
TEXT runtime·cgocallback(SB), NOSPLIT, $32-32
UNDEF
// gcWriteBarrier performs a heap pointer write and informs the GC.
//
// gcWriteBarrier does NOT follow the Go ABI. It has two WebAssembly parameters:
// R0: the destination of the write (i64)
// R1: the value being written (i64)
TEXT runtime·gcWriteBarrier(SB), NOSPLIT, $16
// R3 = g.m
MOVD g_m(g), R3
// R4 = p
MOVD m_p(R3), R4
// R5 = wbBuf.next
MOVD p_wbBuf+wbBuf_next(R4), R5
// Record value
MOVD R1, 0(R5)
// Record *slot
MOVD R0, 8(R5)
// Increment wbBuf.next
Get R5
I64Const $16
I64Add
Set R5
MOVD R5, p_wbBuf+wbBuf_next(R4)
Get R5
I64Load (p_wbBuf+wbBuf_end)(R4)
I64Eq
If
// Flush
MOVD R0, 0(SP)
MOVD R1, 8(SP)
CALLNORESUME runtime·wbBufFlush(SB)
End
// Do the write
MOVD R1, (R0)
RET