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asm_wasm.s
// 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|NOFRAME|TOPFRAME, $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) #ifdef GOOS_js CALLNORESUME runtime·args(SB) #endif CALLNORESUME runtime·osinit(SB) CALLNORESUME runtime·schedinit(SB) MOVD $runtime·mainPC(SB), 0(SP) CALLNORESUME runtime·newproc(SB) CALL runtime·mstart(SB) // WebAssembly stack will unwind when switching to another goroutine UNDEF TEXT runtime·mstart(SB),NOSPLIT|TOPFRAME,$0 CALL runtime·mstart0(SB) RET // not reached DATA runtime·mainPC+0(SB)/8,$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), R1 MOVD 0(R1), R2 // make sure g != nil MOVD R1, g MOVD gobuf_sp(R0), SP // Put target PC at -8(SP), wasm_pc_f_loop will pick it up Get SP I32Const $8 I32Sub I64Load gobuf_pc(R0) I64Store $0 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 // 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) CALLNORESUME runtime·abort(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) // 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·abort(SB),NOSPLIT|NOFRAME,$0-0 UNDEF // AES hashing not implemented for wasm TEXT runtime·memhash(SB),NOSPLIT|NOFRAME,$0-32 JMP runtime·memhashFallback(SB) TEXT runtime·strhash(SB),NOSPLIT|NOFRAME,$0-24 JMP runtime·strhashFallback(SB) TEXT runtime·memhash32(SB),NOSPLIT|NOFRAME,$0-24 JMP runtime·memhash32Fallback(SB) TEXT runtime·memhash64(SB),NOSPLIT|NOFRAME,$0-24 JMP runtime·memhash64Fallback(SB) TEXT runtime·return0(SB), NOSPLIT, $0-0 MOVD $0, RET0 RET 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 // func switchToCrashStack0(fn func()) TEXT runtime·switchToCrashStack0(SB), NOSPLIT, $0-8 MOVD fn+0(FP), CTXT // context register MOVD g_m(g), R2 // curm // set g to gcrash MOVD $runtime·gcrash(SB), g // g = &gcrash MOVD R2, g_m(g) // g.m = curm MOVD g, m_g0(R2) // curm.g0 = g // switch to crashstack I64Load (g_stack+stack_hi)(g) I64Const $(-4*8) I64Add I32WrapI64 Set SP // call target function Get CTXT I32WrapI64 I64Load $0 CALL // should never return CALL runtime·abort(SB) 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 // Set g->sched to context in f. NOP SP // tell vet SP changed - stop checking offsets MOVD 0(SP), g_sched+gobuf_pc(g) MOVD $8(SP), g_sched+gobuf_sp(g) // f's SP MOVD CTXT, g_sched+gobuf_ctxt(g) // Cannot grow scheduler stack (m->g0). Get g Get R2 I64Eq If CALLNORESUME runtime·badmorestackg0(SB) CALLNORESUME runtime·abort(SB) End // Cannot grow signal stack (m->gsignal). Get g I64Load m_gsignal(R1) I64Eq If CALLNORESUME runtime·badmorestackgsignal(SB) CALLNORESUME runtime·abort(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) // 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 #define DISPATCH(NAME, MAXSIZE) \ Get R0; \ I64Const $MAXSIZE; \ I64LeU; \ If; \ JMP NAME(SB); \ End TEXT ·reflectcall(SB), NOSPLIT, $0-48 I64Load fn+8(FP) I64Eqz If CALLNORESUME runtime·sigpanic<ABIInternal>(SB) End MOVW frameSize+32(FP), R0 DISPATCH(runtime·call16, 16) 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-48; \ NO_LOCAL_POINTERS; \ MOVW stackArgsSize+24(FP), R0; \ \ Get R0; \ I64Eqz; \ Not; \ If; \ Get SP; \ I64Load stackArgs+16(FP); \ I32WrapI64; \ I64Load stackArgsSize+24(FP); \ I32WrapI64; \ MemoryCopy; \ End; \ \ MOVD f+8(FP), CTXT; \ Get CTXT; \ I32WrapI64; \ I64Load $0; \ CALL; \ \ I64Load32U stackRetOffset+28(FP); \ Set R0; \ \ MOVD stackArgsType+0(FP), RET0; \ \ I64Load stackArgs+16(FP); \ Get R0; \ I64Add; \ Set RET1; \ \ Get SP; \ I64ExtendI32U; \ Get R0; \ I64Add; \ Set RET2; \ \ I64Load32U stackArgsSize+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, $40-0 NO_LOCAL_POINTERS MOVD RET0, 0(SP) MOVD RET1, 8(SP) MOVD RET2, 16(SP) MOVD RET3, 24(SP) MOVD $0, 32(SP) CALL runtime·reflectcallmove(SB) RET CALLFN(·call16, 16) 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|TOPFRAME, $0-0 NOP // first PC of goexit is skipped CALL runtime·goexit1(SB) // does not return UNDEF TEXT runtime·cgocallback(SB), NOSPLIT, $0-24 UNDEF // gcWriteBarrier informs the GC about heap pointer writes. // // gcWriteBarrier does NOT follow the Go ABI. It accepts the // number of bytes of buffer needed as a wasm argument // (put on the TOS by the caller, lives in local R0 in this body) // and returns a pointer to the buffer space as a wasm result // (left on the TOS in this body, appears on the wasm stack // in the caller). TEXT gcWriteBarrier<>(SB), NOSPLIT, $0 Loop // 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 // Increment wbBuf.next Get R5 Get R0 I64Add Set R5 // Is the buffer full? Get R5 I64Load (p_wbBuf+wbBuf_end)(R4) I64LeU If // Commit to the larger buffer. MOVD R5, p_wbBuf+wbBuf_next(R4) // Make return value (the original next position) Get R5 Get R0 I64Sub Return End // Flush CALLNORESUME runtime·wbBufFlush(SB) // Retry Br $0 End TEXT runtime·gcWriteBarrier1<ABIInternal>(SB),NOSPLIT,$0 I64Const $8 Call gcWriteBarrier<>(SB) Return TEXT runtime·gcWriteBarrier2<ABIInternal>(SB),NOSPLIT,$0 I64Const $16 Call gcWriteBarrier<>(SB) Return TEXT runtime·gcWriteBarrier3<ABIInternal>(SB),NOSPLIT,$0 I64Const $24 Call gcWriteBarrier<>(SB) Return TEXT runtime·gcWriteBarrier4<ABIInternal>(SB),NOSPLIT,$0 I64Const $32 Call gcWriteBarrier<>(SB) Return TEXT runtime·gcWriteBarrier5<ABIInternal>(SB),NOSPLIT,$0 I64Const $40 Call gcWriteBarrier<>(SB) Return TEXT runtime·gcWriteBarrier6<ABIInternal>(SB),NOSPLIT,$0 I64Const $48 Call gcWriteBarrier<>(SB) Return TEXT runtime·gcWriteBarrier7<ABIInternal>(SB),NOSPLIT,$0 I64Const $56 Call gcWriteBarrier<>(SB) Return TEXT runtime·gcWriteBarrier8<ABIInternal>(SB),NOSPLIT,$0 I64Const $64 Call gcWriteBarrier<>(SB) Return TEXT wasm_pc_f_loop(SB),NOSPLIT,$0 // Call the function for the current PC_F. Repeat until PAUSE != 0 indicates pause or exit. // The WebAssembly stack may unwind, e.g. when switching goroutines. // The Go stack on the linear memory is then used to jump to the correct functions // with this loop, without having to restore the full WebAssembly stack. // It is expected to have a pending call before entering the loop, so check PAUSE first. Get PAUSE I32Eqz If loop: Loop // Get PC_B & PC_F from -8(SP) Get SP I32Const $8 I32Sub I32Load16U $0 // PC_B Get SP I32Const $8 I32Sub I32Load16U $2 // PC_F CallIndirect $0 Drop Get PAUSE I32Eqz BrIf loop End End I32Const $0 Set PAUSE Return TEXT wasm_export_lib(SB),NOSPLIT,$0 UNDEF
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