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Diffstat (limited to 'src/runtime/asm_mips64x.s')
| -rw-r--r-- | src/runtime/asm_mips64x.s | 804 |
1 files changed, 804 insertions, 0 deletions
diff --git a/src/runtime/asm_mips64x.s b/src/runtime/asm_mips64x.s new file mode 100644 index 0000000..1abadb9 --- /dev/null +++ b/src/runtime/asm_mips64x.s @@ -0,0 +1,804 @@ +// Copyright 2015 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. + +//go:build mips64 || mips64le + +#include "go_asm.h" +#include "go_tls.h" +#include "funcdata.h" +#include "textflag.h" + +#define REGCTXT R22 + +TEXT runtime·rt0_go(SB),NOSPLIT|TOPFRAME,$0 + // R29 = stack; R4 = argc; R5 = argv + + ADDV $-24, R29 + MOVW R4, 8(R29) // argc + MOVV R5, 16(R29) // argv + + // create istack out of the given (operating system) stack. + // _cgo_init may update stackguard. + MOVV $runtime·g0(SB), g + MOVV $(-64*1024), R23 + ADDV R23, R29, R1 + MOVV R1, g_stackguard0(g) + MOVV R1, g_stackguard1(g) + MOVV R1, (g_stack+stack_lo)(g) + MOVV R29, (g_stack+stack_hi)(g) + + // if there is a _cgo_init, call it using the gcc ABI. + MOVV _cgo_init(SB), R25 + BEQ R25, nocgo + + MOVV R0, R7 // arg 3: not used + MOVV R0, R6 // arg 2: not used + MOVV $setg_gcc<>(SB), R5 // arg 1: setg + MOVV g, R4 // arg 0: G + JAL (R25) + +nocgo: + // update stackguard after _cgo_init + MOVV (g_stack+stack_lo)(g), R1 + ADDV $const__StackGuard, R1 + MOVV R1, g_stackguard0(g) + MOVV R1, g_stackguard1(g) + + // set the per-goroutine and per-mach "registers" + MOVV $runtime·m0(SB), R1 + + // save m->g0 = g0 + MOVV g, m_g0(R1) + // save m0 to g0->m + MOVV R1, g_m(g) + + JAL runtime·check(SB) + + // args are already prepared + JAL runtime·args(SB) + JAL runtime·osinit(SB) + JAL runtime·schedinit(SB) + + // create a new goroutine to start program + MOVV $runtime·mainPC(SB), R1 // entry + ADDV $-16, R29 + MOVV R1, 8(R29) + MOVV R0, 0(R29) + JAL runtime·newproc(SB) + ADDV $16, R29 + + // start this M + JAL runtime·mstart(SB) + + MOVV R0, 1(R0) + RET + +DATA runtime·mainPC+0(SB)/8,$runtime·main(SB) +GLOBL runtime·mainPC(SB),RODATA,$8 + +TEXT runtime·breakpoint(SB),NOSPLIT|NOFRAME,$0-0 + MOVV R0, 2(R0) // TODO: TD + RET + +TEXT runtime·asminit(SB),NOSPLIT|NOFRAME,$0-0 + RET + +TEXT runtime·mstart(SB),NOSPLIT|TOPFRAME,$0 + JAL runtime·mstart0(SB) + RET // not reached + +/* + * go-routine + */ + +// void gogo(Gobuf*) +// restore state from Gobuf; longjmp +TEXT runtime·gogo(SB), NOSPLIT|NOFRAME, $0-8 + MOVV buf+0(FP), R3 + MOVV gobuf_g(R3), R4 + MOVV 0(R4), R0 // make sure g != nil + JMP gogo<>(SB) + +TEXT gogo<>(SB), NOSPLIT|NOFRAME, $0 + MOVV R4, g + JAL runtime·save_g(SB) + + MOVV 0(g), R2 + MOVV gobuf_sp(R3), R29 + MOVV gobuf_lr(R3), R31 + MOVV gobuf_ret(R3), R1 + MOVV gobuf_ctxt(R3), REGCTXT + MOVV R0, gobuf_sp(R3) + MOVV R0, gobuf_ret(R3) + MOVV R0, gobuf_lr(R3) + MOVV R0, gobuf_ctxt(R3) + MOVV gobuf_pc(R3), R4 + JMP (R4) + +// void 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|NOFRAME, $0-8 + // Save caller state in g->sched + MOVV R29, (g_sched+gobuf_sp)(g) + MOVV R31, (g_sched+gobuf_pc)(g) + MOVV R0, (g_sched+gobuf_lr)(g) + + // Switch to m->g0 & its stack, call fn. + MOVV g, R1 + MOVV g_m(g), R3 + MOVV m_g0(R3), g + JAL runtime·save_g(SB) + BNE g, R1, 2(PC) + JMP runtime·badmcall(SB) + MOVV fn+0(FP), REGCTXT // context + MOVV 0(REGCTXT), R4 // code pointer + MOVV (g_sched+gobuf_sp)(g), R29 // sp = m->g0->sched.sp + ADDV $-16, R29 + MOVV R1, 8(R29) + MOVV R0, 0(R29) + JAL (R4) + JMP runtime·badmcall2(SB) + +// systemstack_switch is a dummy routine that systemstack leaves at the bottom +// of the G stack. We need to distinguish the routine that +// lives at the bottom of the G stack from the one that lives +// at the top of the system stack because the one at the top of +// the system stack terminates the stack walk (see topofstack()). +TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0 + UNDEF + JAL (R31) // make sure this function is not leaf + RET + +// func systemstack(fn func()) +TEXT runtime·systemstack(SB), NOSPLIT, $0-8 + MOVV fn+0(FP), R1 // R1 = fn + MOVV R1, REGCTXT // context + MOVV g_m(g), R2 // R2 = m + + MOVV m_gsignal(R2), R3 // R3 = gsignal + BEQ g, R3, noswitch + + MOVV m_g0(R2), R3 // R3 = g0 + BEQ g, R3, noswitch + + MOVV m_curg(R2), R4 + BEQ g, R4, switch + + // Bad: g is not gsignal, not g0, not curg. What is it? + // Hide call from linker nosplit analysis. + MOVV $runtime·badsystemstack(SB), R4 + JAL (R4) + JAL runtime·abort(SB) + +switch: + // save our state in g->sched. Pretend to + // be systemstack_switch if the G stack is scanned. + JAL gosave_systemstack_switch<>(SB) + + // switch to g0 + MOVV R3, g + JAL runtime·save_g(SB) + MOVV (g_sched+gobuf_sp)(g), R1 + MOVV R1, R29 + + // call target function + MOVV 0(REGCTXT), R4 // code pointer + JAL (R4) + + // switch back to g + MOVV g_m(g), R1 + MOVV m_curg(R1), g + JAL runtime·save_g(SB) + MOVV (g_sched+gobuf_sp)(g), R29 + MOVV R0, (g_sched+gobuf_sp)(g) + RET + +noswitch: + // already on m stack, just call directly + // Using a tail call here cleans up tracebacks since we won't stop + // at an intermediate systemstack. + MOVV 0(REGCTXT), R4 // code pointer + MOVV 0(R29), R31 // restore LR + ADDV $8, R29 + JMP (R4) + +/* + * support for morestack + */ + +// Called during function prolog when more stack is needed. +// Caller has already loaded: +// R1: framesize, R2: argsize, R3: LR +// +// 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|NOFRAME,$0-0 + // Cannot grow scheduler stack (m->g0). + MOVV g_m(g), R7 + MOVV m_g0(R7), R8 + BNE g, R8, 3(PC) + JAL runtime·badmorestackg0(SB) + JAL runtime·abort(SB) + + // Cannot grow signal stack (m->gsignal). + MOVV m_gsignal(R7), R8 + BNE g, R8, 3(PC) + JAL runtime·badmorestackgsignal(SB) + JAL runtime·abort(SB) + + // Called from f. + // Set g->sched to context in f. + MOVV R29, (g_sched+gobuf_sp)(g) + MOVV R31, (g_sched+gobuf_pc)(g) + MOVV R3, (g_sched+gobuf_lr)(g) + MOVV REGCTXT, (g_sched+gobuf_ctxt)(g) + + // Called from f. + // Set m->morebuf to f's caller. + MOVV R3, (m_morebuf+gobuf_pc)(R7) // f's caller's PC + MOVV R29, (m_morebuf+gobuf_sp)(R7) // f's caller's SP + MOVV g, (m_morebuf+gobuf_g)(R7) + + // Call newstack on m->g0's stack. + MOVV m_g0(R7), g + JAL runtime·save_g(SB) + MOVV (g_sched+gobuf_sp)(g), R29 + // Create a stack frame on g0 to call newstack. + MOVV R0, -8(R29) // Zero saved LR in frame + ADDV $-8, R29 + JAL runtime·newstack(SB) + + // Not reached, but make sure the return PC from the call to newstack + // is still in this function, and not the beginning of the next. + UNDEF + +TEXT runtime·morestack_noctxt(SB),NOSPLIT|NOFRAME,$0-0 + // Force SPWRITE. This function doesn't actually write SP, + // but it is called with a special calling convention where + // the caller doesn't save LR on stack but passes it as a + // register (R3), and the unwinder currently doesn't understand. + // Make it SPWRITE to stop unwinding. (See issue 54332) + MOVV R29, R29 + + MOVV R0, REGCTXT + JMP runtime·morestack(SB) + +// reflectcall: call a function with the given argument list +// func call(stackArgsType *_type, f *FuncVal, stackArgs *byte, stackArgsSize, stackRetOffset, frameSize uint32, regArgs *abi.RegArgs). +// we don't have variable-sized frames, so we use a small number +// of constant-sized-frame functions to encode a few bits of size in the pc. +// Caution: ugly multiline assembly macros in your future! + +#define DISPATCH(NAME,MAXSIZE) \ + MOVV $MAXSIZE, R23; \ + SGTU R1, R23, R23; \ + BNE R23, 3(PC); \ + MOVV $NAME(SB), R4; \ + JMP (R4) +// Note: can't just "BR NAME(SB)" - bad inlining results. + +TEXT ·reflectcall(SB), NOSPLIT|NOFRAME, $0-48 + MOVWU frameSize+32(FP), R1 + 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) + MOVV $runtime·badreflectcall(SB), R4 + JMP (R4) + +#define CALLFN(NAME,MAXSIZE) \ +TEXT NAME(SB), WRAPPER, $MAXSIZE-48; \ + NO_LOCAL_POINTERS; \ + /* copy arguments to stack */ \ + MOVV stackArgs+16(FP), R1; \ + MOVWU stackArgsSize+24(FP), R2; \ + MOVV R29, R3; \ + ADDV $8, R3; \ + ADDV R3, R2; \ + BEQ R3, R2, 6(PC); \ + MOVBU (R1), R4; \ + ADDV $1, R1; \ + MOVBU R4, (R3); \ + ADDV $1, R3; \ + JMP -5(PC); \ + /* call function */ \ + MOVV f+8(FP), REGCTXT; \ + MOVV (REGCTXT), R4; \ + PCDATA $PCDATA_StackMapIndex, $0; \ + JAL (R4); \ + /* copy return values back */ \ + MOVV stackArgsType+0(FP), R5; \ + MOVV stackArgs+16(FP), R1; \ + MOVWU stackArgsSize+24(FP), R2; \ + MOVWU stackRetOffset+28(FP), R4; \ + ADDV $8, R29, R3; \ + ADDV R4, R3; \ + ADDV R4, R1; \ + SUBVU R4, R2; \ + JAL 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 + MOVV R5, 8(R29) + MOVV R1, 16(R29) + MOVV R3, 24(R29) + MOVV R2, 32(R29) + MOVV $0, 40(R29) + JAL 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·procyield(SB),NOSPLIT,$0-0 + RET + +// Save state of caller into g->sched, +// but using fake PC from systemstack_switch. +// Must only be called from functions with no locals ($0) +// or else unwinding from systemstack_switch is incorrect. +// Smashes R1. +TEXT gosave_systemstack_switch<>(SB),NOSPLIT|NOFRAME,$0 + MOVV $runtime·systemstack_switch(SB), R1 + ADDV $8, R1 // get past prologue + MOVV R1, (g_sched+gobuf_pc)(g) + MOVV R29, (g_sched+gobuf_sp)(g) + MOVV R0, (g_sched+gobuf_lr)(g) + MOVV R0, (g_sched+gobuf_ret)(g) + // Assert ctxt is zero. See func save. + MOVV (g_sched+gobuf_ctxt)(g), R1 + BEQ R1, 2(PC) + JAL runtime·abort(SB) + RET + +// func asmcgocall_no_g(fn, arg unsafe.Pointer) +// Call fn(arg) aligned appropriately for the gcc ABI. +// Called on a system stack, and there may be no g yet (during needm). +TEXT ·asmcgocall_no_g(SB),NOSPLIT,$0-16 + MOVV fn+0(FP), R25 + MOVV arg+8(FP), R4 + JAL (R25) + RET + +// func asmcgocall(fn, arg unsafe.Pointer) int32 +// Call fn(arg) on the scheduler stack, +// aligned appropriately for the gcc ABI. +// See cgocall.go for more details. +TEXT ·asmcgocall(SB),NOSPLIT,$0-20 + MOVV fn+0(FP), R25 + MOVV arg+8(FP), R4 + + MOVV R29, R3 // save original stack pointer + MOVV g, R2 + + // Figure out if we need to switch to m->g0 stack. + // We get called to create new OS threads too, and those + // come in on the m->g0 stack already. Or we might already + // be on the m->gsignal stack. + MOVV g_m(g), R5 + MOVV m_gsignal(R5), R6 + BEQ R6, g, g0 + MOVV m_g0(R5), R6 + BEQ R6, g, g0 + + JAL gosave_systemstack_switch<>(SB) + MOVV R6, g + JAL runtime·save_g(SB) + MOVV (g_sched+gobuf_sp)(g), R29 + + // Now on a scheduling stack (a pthread-created stack). +g0: + // Save room for two of our pointers. + ADDV $-16, R29 + MOVV R2, 0(R29) // save old g on stack + MOVV (g_stack+stack_hi)(R2), R2 + SUBVU R3, R2 + MOVV R2, 8(R29) // save depth in old g stack (can't just save SP, as stack might be copied during a callback) + JAL (R25) + + // Restore g, stack pointer. R2 is return value. + MOVV 0(R29), g + JAL runtime·save_g(SB) + MOVV (g_stack+stack_hi)(g), R5 + MOVV 8(R29), R6 + SUBVU R6, R5 + MOVV R5, R29 + + MOVW R2, ret+16(FP) + RET + +// func cgocallback(fn, frame unsafe.Pointer, ctxt uintptr) +// See cgocall.go for more details. +TEXT ·cgocallback(SB),NOSPLIT,$24-24 + NO_LOCAL_POINTERS + + // Load m and g from thread-local storage. + MOVB runtime·iscgo(SB), R1 + BEQ R1, nocgo + JAL runtime·load_g(SB) +nocgo: + + // If g is nil, Go did not create the current thread. + // Call needm to obtain one for temporary use. + // In this case, we're running on the thread stack, so there's + // lots of space, but the linker doesn't know. Hide the call from + // the linker analysis by using an indirect call. + BEQ g, needm + + MOVV g_m(g), R3 + MOVV R3, savedm-8(SP) + JMP havem + +needm: + MOVV g, savedm-8(SP) // g is zero, so is m. + MOVV $runtime·needm(SB), R4 + JAL (R4) + + // Set m->sched.sp = SP, so that if a panic happens + // during the function we are about to execute, it will + // have a valid SP to run on the g0 stack. + // The next few lines (after the havem label) + // will save this SP onto the stack and then write + // the same SP back to m->sched.sp. That seems redundant, + // but if an unrecovered panic happens, unwindm will + // restore the g->sched.sp from the stack location + // and then systemstack will try to use it. If we don't set it here, + // that restored SP will be uninitialized (typically 0) and + // will not be usable. + MOVV g_m(g), R3 + MOVV m_g0(R3), R1 + MOVV R29, (g_sched+gobuf_sp)(R1) + +havem: + // Now there's a valid m, and we're running on its m->g0. + // Save current m->g0->sched.sp on stack and then set it to SP. + // Save current sp in m->g0->sched.sp in preparation for + // switch back to m->curg stack. + // NOTE: unwindm knows that the saved g->sched.sp is at 8(R29) aka savedsp-16(SP). + MOVV m_g0(R3), R1 + MOVV (g_sched+gobuf_sp)(R1), R2 + MOVV R2, savedsp-24(SP) // must match frame size + MOVV R29, (g_sched+gobuf_sp)(R1) + + // Switch to m->curg stack and call runtime.cgocallbackg. + // Because we are taking over the execution of m->curg + // but *not* resuming what had been running, we need to + // save that information (m->curg->sched) so we can restore it. + // We can restore m->curg->sched.sp easily, because calling + // runtime.cgocallbackg leaves SP unchanged upon return. + // To save m->curg->sched.pc, we push it onto the curg stack and + // open a frame the same size as cgocallback's g0 frame. + // Once we switch to the curg stack, the pushed PC will appear + // to be the return PC of cgocallback, so that the traceback + // will seamlessly trace back into the earlier calls. + MOVV m_curg(R3), g + JAL runtime·save_g(SB) + MOVV (g_sched+gobuf_sp)(g), R2 // prepare stack as R2 + MOVV (g_sched+gobuf_pc)(g), R4 + MOVV R4, -(24+8)(R2) // "saved LR"; must match frame size + // Gather our arguments into registers. + MOVV fn+0(FP), R5 + MOVV frame+8(FP), R6 + MOVV ctxt+16(FP), R7 + MOVV $-(24+8)(R2), R29 // switch stack; must match frame size + MOVV R5, 8(R29) + MOVV R6, 16(R29) + MOVV R7, 24(R29) + JAL runtime·cgocallbackg(SB) + + // Restore g->sched (== m->curg->sched) from saved values. + MOVV 0(R29), R4 + MOVV R4, (g_sched+gobuf_pc)(g) + MOVV $(24+8)(R29), R2 // must match frame size + MOVV R2, (g_sched+gobuf_sp)(g) + + // Switch back to m->g0's stack and restore m->g0->sched.sp. + // (Unlike m->curg, the g0 goroutine never uses sched.pc, + // so we do not have to restore it.) + MOVV g_m(g), R3 + MOVV m_g0(R3), g + JAL runtime·save_g(SB) + MOVV (g_sched+gobuf_sp)(g), R29 + MOVV savedsp-24(SP), R2 // must match frame size + MOVV R2, (g_sched+gobuf_sp)(g) + + // If the m on entry was nil, we called needm above to borrow an m + // for the duration of the call. Since the call is over, return it with dropm. + MOVV savedm-8(SP), R3 + BNE R3, droppedm + MOVV $runtime·dropm(SB), R4 + JAL (R4) +droppedm: + + // Done! + RET + +// void setg(G*); set g. for use by needm. +TEXT runtime·setg(SB), NOSPLIT, $0-8 + MOVV gg+0(FP), g + // This only happens if iscgo, so jump straight to save_g + JAL runtime·save_g(SB) + RET + +// void setg_gcc(G*); set g called from gcc with g in R1 +TEXT setg_gcc<>(SB),NOSPLIT,$0-0 + MOVV R1, g + JAL runtime·save_g(SB) + RET + +TEXT runtime·abort(SB),NOSPLIT|NOFRAME,$0-0 + MOVW (R0), R0 + UNDEF + +// AES hashing not implemented for mips64 +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 + MOVW $0, R1 + RET + +// Called from cgo wrappers, this function returns g->m->curg.stack.hi. +// Must obey the gcc calling convention. +TEXT _cgo_topofstack(SB),NOSPLIT,$16 + // g (R30) and REGTMP (R23) might be clobbered by load_g. They + // are callee-save in the gcc calling convention, so save them. + MOVV R23, savedR23-16(SP) + MOVV g, savedG-8(SP) + + JAL runtime·load_g(SB) + MOVV g_m(g), R1 + MOVV m_curg(R1), R1 + MOVV (g_stack+stack_hi)(R1), R2 // return value in R2 + + MOVV savedG-8(SP), g + MOVV savedR23-16(SP), R23 + RET + +// The top-most function running on a goroutine +// returns to goexit+PCQuantum. +TEXT runtime·goexit(SB),NOSPLIT|NOFRAME|TOPFRAME,$0-0 + NOR R0, R0 // NOP + JAL runtime·goexit1(SB) // does not return + // traceback from goexit1 must hit code range of goexit + NOR R0, R0 // NOP + +TEXT ·checkASM(SB),NOSPLIT,$0-1 + MOVW $1, R1 + MOVB R1, ret+0(FP) + RET + +// gcWriteBarrier performs a heap pointer write and informs the GC. +// +// gcWriteBarrier does NOT follow the Go ABI. It takes two arguments: +// - R20 is the destination of the write +// - R21 is the value being written at R20. +// It clobbers R23 (the linker temp register). +// The act of CALLing gcWriteBarrier will clobber R31 (LR). +// It does not clobber any other general-purpose registers, +// but may clobber others (e.g., floating point registers). +TEXT runtime·gcWriteBarrier(SB),NOSPLIT,$192 + // Save the registers clobbered by the fast path. + MOVV R1, 184(R29) + MOVV R2, 192(R29) + MOVV g_m(g), R1 + MOVV m_p(R1), R1 + MOVV (p_wbBuf+wbBuf_next)(R1), R2 + // Increment wbBuf.next position. + ADDV $16, R2 + MOVV R2, (p_wbBuf+wbBuf_next)(R1) + MOVV (p_wbBuf+wbBuf_end)(R1), R1 + MOVV R1, R23 // R23 is linker temp register + // Record the write. + MOVV R21, -16(R2) // Record value + MOVV (R20), R1 // TODO: This turns bad writes into bad reads. + MOVV R1, -8(R2) // Record *slot + // Is the buffer full? + BEQ R2, R23, flush +ret: + MOVV 184(R29), R1 + MOVV 192(R29), R2 + // Do the write. + MOVV R21, (R20) + RET + +flush: + // Save all general purpose registers since these could be + // clobbered by wbBufFlush and were not saved by the caller. + MOVV R20, 8(R29) // Also first argument to wbBufFlush + MOVV R21, 16(R29) // Also second argument to wbBufFlush + // R1 already saved + // R2 already saved + MOVV R3, 24(R29) + MOVV R4, 32(R29) + MOVV R5, 40(R29) + MOVV R6, 48(R29) + MOVV R7, 56(R29) + MOVV R8, 64(R29) + MOVV R9, 72(R29) + MOVV R10, 80(R29) + MOVV R11, 88(R29) + MOVV R12, 96(R29) + MOVV R13, 104(R29) + MOVV R14, 112(R29) + MOVV R15, 120(R29) + MOVV R16, 128(R29) + MOVV R17, 136(R29) + MOVV R18, 144(R29) + MOVV R19, 152(R29) + // R20 already saved + // R21 already saved. + MOVV R22, 160(R29) + // R23 is tmp register. + MOVV R24, 168(R29) + MOVV R25, 176(R29) + // R26 is reserved by kernel. + // R27 is reserved by kernel. + // R28 is REGSB (not modified by Go code). + // R29 is SP. + // R30 is g. + // R31 is LR, which was saved by the prologue. + + // This takes arguments R20 and R21. + CALL runtime·wbBufFlush(SB) + + MOVV 8(R29), R20 + MOVV 16(R29), R21 + MOVV 24(R29), R3 + MOVV 32(R29), R4 + MOVV 40(R29), R5 + MOVV 48(R29), R6 + MOVV 56(R29), R7 + MOVV 64(R29), R8 + MOVV 72(R29), R9 + MOVV 80(R29), R10 + MOVV 88(R29), R11 + MOVV 96(R29), R12 + MOVV 104(R29), R13 + MOVV 112(R29), R14 + MOVV 120(R29), R15 + MOVV 128(R29), R16 + MOVV 136(R29), R17 + MOVV 144(R29), R18 + MOVV 152(R29), R19 + MOVV 160(R29), R22 + MOVV 168(R29), R24 + MOVV 176(R29), R25 + JMP ret + +// Note: these functions use a special calling convention to save generated code space. +// Arguments are passed in registers, but the space for those arguments are allocated +// in the caller's stack frame. These stubs write the args into that stack space and +// then tail call to the corresponding runtime handler. +// The tail call makes these stubs disappear in backtraces. +TEXT runtime·panicIndex(SB),NOSPLIT,$0-16 + MOVV R1, x+0(FP) + MOVV R2, y+8(FP) + JMP runtime·goPanicIndex(SB) +TEXT runtime·panicIndexU(SB),NOSPLIT,$0-16 + MOVV R1, x+0(FP) + MOVV R2, y+8(FP) + JMP runtime·goPanicIndexU(SB) +TEXT runtime·panicSliceAlen(SB),NOSPLIT,$0-16 + MOVV R2, x+0(FP) + MOVV R3, y+8(FP) + JMP runtime·goPanicSliceAlen(SB) +TEXT runtime·panicSliceAlenU(SB),NOSPLIT,$0-16 + MOVV R2, x+0(FP) + MOVV R3, y+8(FP) + JMP runtime·goPanicSliceAlenU(SB) +TEXT runtime·panicSliceAcap(SB),NOSPLIT,$0-16 + MOVV R2, x+0(FP) + MOVV R3, y+8(FP) + JMP runtime·goPanicSliceAcap(SB) +TEXT runtime·panicSliceAcapU(SB),NOSPLIT,$0-16 + MOVV R2, x+0(FP) + MOVV R3, y+8(FP) + JMP runtime·goPanicSliceAcapU(SB) +TEXT runtime·panicSliceB(SB),NOSPLIT,$0-16 + MOVV R1, x+0(FP) + MOVV R2, y+8(FP) + JMP runtime·goPanicSliceB(SB) +TEXT runtime·panicSliceBU(SB),NOSPLIT,$0-16 + MOVV R1, x+0(FP) + MOVV R2, y+8(FP) + JMP runtime·goPanicSliceBU(SB) +TEXT runtime·panicSlice3Alen(SB),NOSPLIT,$0-16 + MOVV R3, x+0(FP) + MOVV R4, y+8(FP) + JMP runtime·goPanicSlice3Alen(SB) +TEXT runtime·panicSlice3AlenU(SB),NOSPLIT,$0-16 + MOVV R3, x+0(FP) + MOVV R4, y+8(FP) + JMP runtime·goPanicSlice3AlenU(SB) +TEXT runtime·panicSlice3Acap(SB),NOSPLIT,$0-16 + MOVV R3, x+0(FP) + MOVV R4, y+8(FP) + JMP runtime·goPanicSlice3Acap(SB) +TEXT runtime·panicSlice3AcapU(SB),NOSPLIT,$0-16 + MOVV R3, x+0(FP) + MOVV R4, y+8(FP) + JMP runtime·goPanicSlice3AcapU(SB) +TEXT runtime·panicSlice3B(SB),NOSPLIT,$0-16 + MOVV R2, x+0(FP) + MOVV R3, y+8(FP) + JMP runtime·goPanicSlice3B(SB) +TEXT runtime·panicSlice3BU(SB),NOSPLIT,$0-16 + MOVV R2, x+0(FP) + MOVV R3, y+8(FP) + JMP runtime·goPanicSlice3BU(SB) +TEXT runtime·panicSlice3C(SB),NOSPLIT,$0-16 + MOVV R1, x+0(FP) + MOVV R2, y+8(FP) + JMP runtime·goPanicSlice3C(SB) +TEXT runtime·panicSlice3CU(SB),NOSPLIT,$0-16 + MOVV R1, x+0(FP) + MOVV R2, y+8(FP) + JMP runtime·goPanicSlice3CU(SB) +TEXT runtime·panicSliceConvert(SB),NOSPLIT,$0-16 + MOVV R3, x+0(FP) + MOVV R4, y+8(FP) + JMP runtime·goPanicSliceConvert(SB) |