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Diffstat (limited to 'src/runtime/asm_mipsx.s')
| -rw-r--r-- | src/runtime/asm_mipsx.s | 896 |
1 files changed, 896 insertions, 0 deletions
diff --git a/src/runtime/asm_mipsx.s b/src/runtime/asm_mipsx.s new file mode 100644 index 0000000..ee87d81 --- /dev/null +++ b/src/runtime/asm_mipsx.s @@ -0,0 +1,896 @@ +// Copyright 2016 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. + +// +build mips mipsle + +#include "go_asm.h" +#include "go_tls.h" +#include "funcdata.h" +#include "textflag.h" + +#define REGCTXT R22 + +TEXT runtime·rt0_go(SB),NOSPLIT,$0 + // R29 = stack; R4 = argc; R5 = argv + + ADDU $-12, R29 + MOVW R4, 4(R29) // argc + MOVW R5, 8(R29) // argv + + // create istack out of the given (operating system) stack. + // _cgo_init may update stackguard. + MOVW $runtime·g0(SB), g + MOVW $(-64*1024), R23 + ADD R23, R29, R1 + MOVW R1, g_stackguard0(g) + MOVW R1, g_stackguard1(g) + MOVW R1, (g_stack+stack_lo)(g) + MOVW R29, (g_stack+stack_hi)(g) + + // if there is a _cgo_init, call it using the gcc ABI. + MOVW _cgo_init(SB), R25 + BEQ R25, nocgo + ADDU $-16, R29 + MOVW R0, R7 // arg 3: not used + MOVW R0, R6 // arg 2: not used + MOVW $setg_gcc<>(SB), R5 // arg 1: setg + MOVW g, R4 // arg 0: G + JAL (R25) + ADDU $16, R29 + +nocgo: + // update stackguard after _cgo_init + MOVW (g_stack+stack_lo)(g), R1 + ADD $const__StackGuard, R1 + MOVW R1, g_stackguard0(g) + MOVW R1, g_stackguard1(g) + + // set the per-goroutine and per-mach "registers" + MOVW $runtime·m0(SB), R1 + + // save m->g0 = g0 + MOVW g, m_g0(R1) + // save m0 to g0->m + MOVW 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 + MOVW $runtime·mainPC(SB), R1 // entry + ADDU $-12, R29 + MOVW R1, 8(R29) + MOVW R0, 4(R29) + MOVW R0, 0(R29) + JAL runtime·newproc(SB) + ADDU $12, R29 + + // start this M + JAL runtime·mstart(SB) + + UNDEF + RET + +DATA runtime·mainPC+0(SB)/4,$runtime·main(SB) +GLOBL runtime·mainPC(SB),RODATA,$4 + +TEXT runtime·breakpoint(SB),NOSPLIT,$0-0 + BREAK + RET + +TEXT runtime·asminit(SB),NOSPLIT,$0-0 + RET + +/* + * go-routine + */ + +// void gosave(Gobuf*) +// save state in Gobuf; setjmp +TEXT runtime·gosave(SB),NOSPLIT|NOFRAME,$0-4 + MOVW buf+0(FP), R1 + MOVW R29, gobuf_sp(R1) + MOVW R31, gobuf_pc(R1) + MOVW g, gobuf_g(R1) + MOVW R0, gobuf_lr(R1) + MOVW R0, gobuf_ret(R1) + // Assert ctxt is zero. See func save. + MOVW gobuf_ctxt(R1), R1 + BEQ R1, 2(PC) + JAL runtime·badctxt(SB) + RET + +// void gogo(Gobuf*) +// restore state from Gobuf; longjmp +TEXT runtime·gogo(SB),NOSPLIT,$8-4 + MOVW buf+0(FP), R3 + MOVW gobuf_g(R3), g // make sure g is not nil + JAL runtime·save_g(SB) + + MOVW 0(g), R2 + MOVW gobuf_sp(R3), R29 + MOVW gobuf_lr(R3), R31 + MOVW gobuf_ret(R3), R1 + MOVW gobuf_ctxt(R3), REGCTXT + MOVW R0, gobuf_sp(R3) + MOVW R0, gobuf_ret(R3) + MOVW R0, gobuf_lr(R3) + MOVW R0, gobuf_ctxt(R3) + MOVW 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,$0-4 + // Save caller state in g->sched + MOVW R29, (g_sched+gobuf_sp)(g) + MOVW R31, (g_sched+gobuf_pc)(g) + MOVW R0, (g_sched+gobuf_lr)(g) + MOVW g, (g_sched+gobuf_g)(g) + + // Switch to m->g0 & its stack, call fn. + MOVW g, R1 + MOVW g_m(g), R3 + MOVW m_g0(R3), g + JAL runtime·save_g(SB) + BNE g, R1, 2(PC) + JMP runtime·badmcall(SB) + MOVW fn+0(FP), REGCTXT // context + MOVW 0(REGCTXT), R4 // code pointer + MOVW (g_sched+gobuf_sp)(g), R29 // sp = m->g0->sched.sp + ADDU $-8, R29 // make room for 1 arg and fake LR + MOVW R1, 4(R29) + MOVW 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,$0-4 + MOVW fn+0(FP), R1 // R1 = fn + MOVW R1, REGCTXT // context + MOVW g_m(g), R2 // R2 = m + + MOVW m_gsignal(R2), R3 // R3 = gsignal + BEQ g, R3, noswitch + + MOVW m_g0(R2), R3 // R3 = g0 + BEQ g, R3, noswitch + + MOVW 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. + MOVW $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. + MOVW $runtime·systemstack_switch(SB), R4 + ADDU $8, R4 // get past prologue + MOVW R4, (g_sched+gobuf_pc)(g) + MOVW R29, (g_sched+gobuf_sp)(g) + MOVW R0, (g_sched+gobuf_lr)(g) + MOVW g, (g_sched+gobuf_g)(g) + + // switch to g0 + MOVW R3, g + JAL runtime·save_g(SB) + MOVW (g_sched+gobuf_sp)(g), R1 + // make it look like mstart called systemstack on g0, to stop traceback + ADDU $-4, R1 + MOVW $runtime·mstart(SB), R2 + MOVW R2, 0(R1) + MOVW R1, R29 + + // call target function + MOVW 0(REGCTXT), R4 // code pointer + JAL (R4) + + // switch back to g + MOVW g_m(g), R1 + MOVW m_curg(R1), g + JAL runtime·save_g(SB) + MOVW (g_sched+gobuf_sp)(g), R29 + MOVW 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. + MOVW 0(REGCTXT), R4 // code pointer + MOVW 0(R29), R31 // restore LR + ADD $4, 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). + MOVW g_m(g), R7 + MOVW m_g0(R7), R8 + BNE g, R8, 3(PC) + JAL runtime·badmorestackg0(SB) + JAL runtime·abort(SB) + + // Cannot grow signal stack (m->gsignal). + MOVW 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. + MOVW R29, (g_sched+gobuf_sp)(g) + MOVW R31, (g_sched+gobuf_pc)(g) + MOVW R3, (g_sched+gobuf_lr)(g) + MOVW REGCTXT, (g_sched+gobuf_ctxt)(g) + + // Called from f. + // Set m->morebuf to f's caller. + MOVW R3, (m_morebuf+gobuf_pc)(R7) // f's caller's PC + MOVW R29, (m_morebuf+gobuf_sp)(R7) // f's caller's SP + MOVW g, (m_morebuf+gobuf_g)(R7) + + // Call newstack on m->g0's stack. + MOVW m_g0(R7), g + JAL runtime·save_g(SB) + MOVW (g_sched+gobuf_sp)(g), R29 + // Create a stack frame on g0 to call newstack. + MOVW R0, -4(R29) // Zero saved LR in frame + ADDU $-4, 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,$0-0 + MOVW R0, REGCTXT + JMP runtime·morestack(SB) + +// reflectcall: call a function with the given argument list +// func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32). +// 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. + +#define DISPATCH(NAME,MAXSIZE) \ + MOVW $MAXSIZE, R23; \ + SGTU R1, R23, R23; \ + BNE R23, 3(PC); \ + MOVW $NAME(SB), R4; \ + JMP (R4) + +TEXT ·reflectcall(SB),NOSPLIT|NOFRAME,$0-20 + MOVW argsize+12(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) + MOVW $runtime·badreflectcall(SB), R4 + JMP (R4) + +#define CALLFN(NAME,MAXSIZE) \ +TEXT NAME(SB),WRAPPER,$MAXSIZE-20; \ + NO_LOCAL_POINTERS; \ + /* copy arguments to stack */ \ + MOVW arg+8(FP), R1; \ + MOVW argsize+12(FP), R2; \ + MOVW R29, R3; \ + ADDU $4, R3; \ + ADDU R3, R2; \ + BEQ R3, R2, 6(PC); \ + MOVBU (R1), R4; \ + ADDU $1, R1; \ + MOVBU R4, (R3); \ + ADDU $1, R3; \ + JMP -5(PC); \ + /* call function */ \ + MOVW f+4(FP), REGCTXT; \ + MOVW (REGCTXT), R4; \ + PCDATA $PCDATA_StackMapIndex, $0; \ + JAL (R4); \ + /* copy return values back */ \ + MOVW argtype+0(FP), R5; \ + MOVW arg+8(FP), R1; \ + MOVW n+12(FP), R2; \ + MOVW retoffset+16(FP), R4; \ + ADDU $4, R29, R3; \ + ADDU R4, R3; \ + ADDU R4, R1; \ + SUBU 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, $16-0 + MOVW R5, 4(R29) + MOVW R1, 8(R29) + MOVW R3, 12(R29) + MOVW R2, 16(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,$0-4 + RET + +// void jmpdefer(fv, sp); +// called from deferreturn. +// 1. grab stored LR for caller +// 2. sub 8 bytes to get back to JAL deferreturn +// 3. JMP to fn +TEXT runtime·jmpdefer(SB),NOSPLIT,$0-8 + MOVW 0(R29), R31 + ADDU $-8, R31 + + MOVW fv+0(FP), REGCTXT + MOVW argp+4(FP), R29 + ADDU $-4, R29 + NOR R0, R0 // prevent scheduling + MOVW 0(REGCTXT), R4 + JMP (R4) + +// Save state of caller into g->sched. Smashes R1. +TEXT gosave<>(SB),NOSPLIT|NOFRAME,$0 + MOVW R31, (g_sched+gobuf_pc)(g) + MOVW R29, (g_sched+gobuf_sp)(g) + MOVW R0, (g_sched+gobuf_lr)(g) + MOVW R0, (g_sched+gobuf_ret)(g) + // Assert ctxt is zero. See func save. + MOVW (g_sched+gobuf_ctxt)(g), R1 + BEQ R1, 2(PC) + JAL runtime·badctxt(SB) + 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,$0-12 + MOVW fn+0(FP), R25 + MOVW arg+4(FP), R4 + + MOVW R29, R3 // save original stack pointer + MOVW 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. + MOVW g_m(g), R5 + MOVW m_g0(R5), R6 + BEQ R6, g, g0 + + JAL gosave<>(SB) + MOVW R6, g + JAL runtime·save_g(SB) + MOVW (g_sched+gobuf_sp)(g), R29 + + // Now on a scheduling stack (a pthread-created stack). +g0: + // Save room for two of our pointers and O32 frame. + ADDU $-24, R29 + AND $~7, R29 // O32 ABI expects 8-byte aligned stack on function entry + MOVW R2, 16(R29) // save old g on stack + MOVW (g_stack+stack_hi)(R2), R2 + SUBU R3, R2 + MOVW R2, 20(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. + MOVW 16(R29), g + JAL runtime·save_g(SB) + MOVW (g_stack+stack_hi)(g), R5 + MOVW 20(R29), R6 + SUBU R6, R5 + MOVW R5, R29 + + MOVW R2, ret+8(FP) + RET + +// cgocallback(fn, frame unsafe.Pointer, ctxt uintptr) +// See cgocall.go for more details. +TEXT ·cgocallback(SB),NOSPLIT,$12-12 + 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 + + MOVW g_m(g), R3 + MOVW R3, savedm-4(SP) + JMP havem + +needm: + MOVW g, savedm-4(SP) // g is zero, so is m. + MOVW $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. + MOVW g_m(g), R3 + MOVW m_g0(R3), R1 + MOVW 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 4(R29) aka savedsp-8(SP). + MOVW m_g0(R3), R1 + MOVW (g_sched+gobuf_sp)(R1), R2 + MOVW R2, savedsp-12(SP) // must match frame size + MOVW 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. + MOVW m_curg(R3), g + JAL runtime·save_g(SB) + MOVW (g_sched+gobuf_sp)(g), R2 // prepare stack as R2 + MOVW (g_sched+gobuf_pc)(g), R4 + MOVW R4, -(12+4)(R2) // "saved LR"; must match frame size + // Gather our arguments into registers. + MOVW fn+0(FP), R5 + MOVW frame+4(FP), R6 + MOVW ctxt+8(FP), R7 + MOVW $-(12+4)(R2), R29 // switch stack; must match frame size + MOVW R5, 4(R29) + MOVW R6, 8(R29) + MOVW R7, 12(R29) + JAL runtime·cgocallbackg(SB) + + // Restore g->sched (== m->curg->sched) from saved values. + MOVW 0(R29), R4 + MOVW R4, (g_sched+gobuf_pc)(g) + MOVW $(12+4)(R29), R2 // must match frame size + MOVW 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.) + MOVW g_m(g), R3 + MOVW m_g0(R3), g + JAL runtime·save_g(SB) + MOVW (g_sched+gobuf_sp)(g), R29 + MOVW savedsp-12(SP), R2 // must match frame size + MOVW 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. + MOVW savedm-4(SP), R3 + BNE R3, droppedm + MOVW $runtime·dropm(SB), R4 + JAL (R4) +droppedm: + + // Done! + RET + +// void setg(G*); set g. for use by needm. +// This only happens if iscgo, so jump straight to save_g +TEXT runtime·setg(SB),NOSPLIT,$0-4 + MOVW gg+0(FP), g + JAL runtime·save_g(SB) + RET + +// void setg_gcc(G*); set g in C TLS. +// Must obey the gcc calling convention. +TEXT setg_gcc<>(SB),NOSPLIT,$0 + MOVW R4, g + JAL runtime·save_g(SB) + RET + +TEXT runtime·abort(SB),NOSPLIT,$0-0 + UNDEF + +// AES hashing not implemented for mips +TEXT runtime·memhash(SB),NOSPLIT|NOFRAME,$0-16 + JMP runtime·memhashFallback(SB) +TEXT runtime·strhash(SB),NOSPLIT|NOFRAME,$0-12 + JMP runtime·strhashFallback(SB) +TEXT runtime·memhash32(SB),NOSPLIT|NOFRAME,$0-12 + JMP runtime·memhash32Fallback(SB) +TEXT runtime·memhash64(SB),NOSPLIT|NOFRAME,$0-12 + 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|NOFRAME,$0 + // g (R30), R3 and REGTMP (R23) might be clobbered by load_g. R30 and R23 + // are callee-save in the gcc calling convention, so save them. + MOVW R23, R8 + MOVW g, R9 + MOVW R31, R10 // this call frame does not save LR + + JAL runtime·load_g(SB) + MOVW g_m(g), R1 + MOVW m_curg(R1), R1 + MOVW (g_stack+stack_hi)(R1), R2 // return value in R2 + + MOVW R8, R23 + MOVW R9, g + MOVW R10, R31 + + 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,$104 + // Save the registers clobbered by the fast path. + MOVW R1, 100(R29) + MOVW R2, 104(R29) + MOVW g_m(g), R1 + MOVW m_p(R1), R1 + MOVW (p_wbBuf+wbBuf_next)(R1), R2 + // Increment wbBuf.next position. + ADD $8, R2 + MOVW R2, (p_wbBuf+wbBuf_next)(R1) + MOVW (p_wbBuf+wbBuf_end)(R1), R1 + MOVW R1, R23 // R23 is linker temp register + // Record the write. + MOVW R21, -8(R2) // Record value + MOVW (R20), R1 // TODO: This turns bad writes into bad reads. + MOVW R1, -4(R2) // Record *slot + // Is the buffer full? + BEQ R2, R23, flush +ret: + MOVW 100(R29), R1 + MOVW 104(R29), R2 + // Do the write. + MOVW R21, (R20) + RET + +flush: + // Save all general purpose registers since these could be + // clobbered by wbBufFlush and were not saved by the caller. + MOVW R20, 4(R29) // Also first argument to wbBufFlush + MOVW R21, 8(R29) // Also second argument to wbBufFlush + // R1 already saved + // R2 already saved + MOVW R3, 12(R29) + MOVW R4, 16(R29) + MOVW R5, 20(R29) + MOVW R6, 24(R29) + MOVW R7, 28(R29) + MOVW R8, 32(R29) + MOVW R9, 36(R29) + MOVW R10, 40(R29) + MOVW R11, 44(R29) + MOVW R12, 48(R29) + MOVW R13, 52(R29) + MOVW R14, 56(R29) + MOVW R15, 60(R29) + MOVW R16, 64(R29) + MOVW R17, 68(R29) + MOVW R18, 72(R29) + MOVW R19, 76(R29) + MOVW R20, 80(R29) + // R21 already saved + // R22 already saved. + MOVW R22, 84(R29) + // R23 is tmp register. + MOVW R24, 88(R29) + MOVW R25, 92(R29) + // R26 is reserved by kernel. + // R27 is reserved by kernel. + MOVW R28, 96(R29) + // 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) + + MOVW 4(R29), R20 + MOVW 8(R29), R21 + MOVW 12(R29), R3 + MOVW 16(R29), R4 + MOVW 20(R29), R5 + MOVW 24(R29), R6 + MOVW 28(R29), R7 + MOVW 32(R29), R8 + MOVW 36(R29), R9 + MOVW 40(R29), R10 + MOVW 44(R29), R11 + MOVW 48(R29), R12 + MOVW 52(R29), R13 + MOVW 56(R29), R14 + MOVW 60(R29), R15 + MOVW 64(R29), R16 + MOVW 68(R29), R17 + MOVW 72(R29), R18 + MOVW 76(R29), R19 + MOVW 80(R29), R20 + MOVW 84(R29), R22 + MOVW 88(R29), R24 + MOVW 92(R29), R25 + MOVW 96(R29), R28 + 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,$0-8 + MOVW R1, x+0(FP) + MOVW R2, y+4(FP) + JMP runtime·goPanicIndex(SB) +TEXT runtime·panicIndexU(SB),NOSPLIT,$0-8 + MOVW R1, x+0(FP) + MOVW R2, y+4(FP) + JMP runtime·goPanicIndexU(SB) +TEXT runtime·panicSliceAlen(SB),NOSPLIT,$0-8 + MOVW R2, x+0(FP) + MOVW R3, y+4(FP) + JMP runtime·goPanicSliceAlen(SB) +TEXT runtime·panicSliceAlenU(SB),NOSPLIT,$0-8 + MOVW R2, x+0(FP) + MOVW R3, y+4(FP) + JMP runtime·goPanicSliceAlenU(SB) +TEXT runtime·panicSliceAcap(SB),NOSPLIT,$0-8 + MOVW R2, x+0(FP) + MOVW R3, y+4(FP) + JMP runtime·goPanicSliceAcap(SB) +TEXT runtime·panicSliceAcapU(SB),NOSPLIT,$0-8 + MOVW R2, x+0(FP) + MOVW R3, y+4(FP) + JMP runtime·goPanicSliceAcapU(SB) +TEXT runtime·panicSliceB(SB),NOSPLIT,$0-8 + MOVW R1, x+0(FP) + MOVW R2, y+4(FP) + JMP runtime·goPanicSliceB(SB) +TEXT runtime·panicSliceBU(SB),NOSPLIT,$0-8 + MOVW R1, x+0(FP) + MOVW R2, y+4(FP) + JMP runtime·goPanicSliceBU(SB) +TEXT runtime·panicSlice3Alen(SB),NOSPLIT,$0-8 + MOVW R3, x+0(FP) + MOVW R4, y+4(FP) + JMP runtime·goPanicSlice3Alen(SB) +TEXT runtime·panicSlice3AlenU(SB),NOSPLIT,$0-8 + MOVW R3, x+0(FP) + MOVW R4, y+4(FP) + JMP runtime·goPanicSlice3AlenU(SB) +TEXT runtime·panicSlice3Acap(SB),NOSPLIT,$0-8 + MOVW R3, x+0(FP) + MOVW R4, y+4(FP) + JMP runtime·goPanicSlice3Acap(SB) +TEXT runtime·panicSlice3AcapU(SB),NOSPLIT,$0-8 + MOVW R3, x+0(FP) + MOVW R4, y+4(FP) + JMP runtime·goPanicSlice3AcapU(SB) +TEXT runtime·panicSlice3B(SB),NOSPLIT,$0-8 + MOVW R2, x+0(FP) + MOVW R3, y+4(FP) + JMP runtime·goPanicSlice3B(SB) +TEXT runtime·panicSlice3BU(SB),NOSPLIT,$0-8 + MOVW R2, x+0(FP) + MOVW R3, y+4(FP) + JMP runtime·goPanicSlice3BU(SB) +TEXT runtime·panicSlice3C(SB),NOSPLIT,$0-8 + MOVW R1, x+0(FP) + MOVW R2, y+4(FP) + JMP runtime·goPanicSlice3C(SB) +TEXT runtime·panicSlice3CU(SB),NOSPLIT,$0-8 + MOVW R1, x+0(FP) + MOVW R2, y+4(FP) + JMP runtime·goPanicSlice3CU(SB) + +// Extended versions for 64-bit indexes. +TEXT runtime·panicExtendIndex(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R1, lo+4(FP) + MOVW R2, y+8(FP) + JMP runtime·goPanicExtendIndex(SB) +TEXT runtime·panicExtendIndexU(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R1, lo+4(FP) + MOVW R2, y+8(FP) + JMP runtime·goPanicExtendIndexU(SB) +TEXT runtime·panicExtendSliceAlen(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R2, lo+4(FP) + MOVW R3, y+8(FP) + JMP runtime·goPanicExtendSliceAlen(SB) +TEXT runtime·panicExtendSliceAlenU(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R2, lo+4(FP) + MOVW R3, y+8(FP) + JMP runtime·goPanicExtendSliceAlenU(SB) +TEXT runtime·panicExtendSliceAcap(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R2, lo+4(FP) + MOVW R3, y+8(FP) + JMP runtime·goPanicExtendSliceAcap(SB) +TEXT runtime·panicExtendSliceAcapU(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R2, lo+4(FP) + MOVW R3, y+8(FP) + JMP runtime·goPanicExtendSliceAcapU(SB) +TEXT runtime·panicExtendSliceB(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R1, lo+4(FP) + MOVW R2, y+8(FP) + JMP runtime·goPanicExtendSliceB(SB) +TEXT runtime·panicExtendSliceBU(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R1, lo+4(FP) + MOVW R2, y+8(FP) + JMP runtime·goPanicExtendSliceBU(SB) +TEXT runtime·panicExtendSlice3Alen(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R3, lo+4(FP) + MOVW R4, y+8(FP) + JMP runtime·goPanicExtendSlice3Alen(SB) +TEXT runtime·panicExtendSlice3AlenU(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R3, lo+4(FP) + MOVW R4, y+8(FP) + JMP runtime·goPanicExtendSlice3AlenU(SB) +TEXT runtime·panicExtendSlice3Acap(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R3, lo+4(FP) + MOVW R4, y+8(FP) + JMP runtime·goPanicExtendSlice3Acap(SB) +TEXT runtime·panicExtendSlice3AcapU(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R3, lo+4(FP) + MOVW R4, y+8(FP) + JMP runtime·goPanicExtendSlice3AcapU(SB) +TEXT runtime·panicExtendSlice3B(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R2, lo+4(FP) + MOVW R3, y+8(FP) + JMP runtime·goPanicExtendSlice3B(SB) +TEXT runtime·panicExtendSlice3BU(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R2, lo+4(FP) + MOVW R3, y+8(FP) + JMP runtime·goPanicExtendSlice3BU(SB) +TEXT runtime·panicExtendSlice3C(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R1, lo+4(FP) + MOVW R2, y+8(FP) + JMP runtime·goPanicExtendSlice3C(SB) +TEXT runtime·panicExtendSlice3CU(SB),NOSPLIT,$0-12 + MOVW R5, hi+0(FP) + MOVW R1, lo+4(FP) + MOVW R2, y+8(FP) + JMP runtime·goPanicExtendSlice3CU(SB) |