| // 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,$0-0 |
| RET |
| |
| /* |
| * go-routine |
| */ |
| |
| // void gosave(Gobuf*) |
| // save state in Gobuf; setjmp |
| TEXT runtime·gosave(SB),NOSPLIT,$-4-4 |
| 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 |
| |
| // If ctxt is not nil, invoke deletion barrier before overwriting. |
| MOVW gobuf_ctxt(R3), R1 |
| BEQ R1, nilctxt |
| MOVW $gobuf_ctxt(R3), R1 |
| MOVW R1, 4(R29) |
| MOVW R0, 8(R29) |
| JAL runtime·writebarrierptr_prewrite(SB) |
| MOVW buf+0(FP), R3 |
| |
| nilctxt: |
| MOVW gobuf_g(R3), g // make sure g is not nil |
| JAL runtime·save_g(SB) |
| |
| MOVW 0(g), R2 |
| MOVW gobuf_sp(R3), R29 |
| MOVW gobuf_lr(R3), R31 |
| MOVW gobuf_ret(R3), R1 |
| MOVW gobuf_ctxt(R3), REGCTXT |
| MOVW R0, gobuf_sp(R3) |
| MOVW R0, gobuf_ret(R3) |
| MOVW R0, gobuf_lr(R3) |
| MOVW R0, gobuf_ctxt(R3) |
| MOVW gobuf_pc(R3), R4 |
| JMP (R4) |
| |
| // void mcall(fn func(*g)) |
| // Switch to m->g0's stack, call fn(g). |
| // Fn must never return. It should gogo(&g->sched) |
| // to keep running g. |
| TEXT runtime·mcall(SB),NOSPLIT,$-4-4 |
| // 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) |
| |
| 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 $runtime·mstart(SB), R2 |
| MOVW R2, 0(R1) |
| MOVW R1, R29 |
| |
| // call target function |
| MOVW 0(REGCTXT), R4 // code pointer |
| JAL (R4) |
| |
| // switch back to g |
| MOVW g_m(g), R1 |
| MOVW m_curg(R1), g |
| JAL runtime·save_g(SB) |
| MOVW (g_sched+gobuf_sp)(g), R29 |
| MOVW R0, (g_sched+gobuf_sp)(g) |
| RET |
| |
| noswitch: |
| // already on m stack, just call directly |
| MOVW 0(REGCTXT), R4 // code pointer |
| JAL (R4) |
| RET |
| |
| /* |
| * support for morestack |
| */ |
| |
| // Called during function prolog when more stack is needed. |
| // Caller has already loaded: |
| // R1: framesize, R2: argsize, R3: LR |
| // |
| // The traceback routines see morestack on a g0 as being |
| // the top of a stack (for example, morestack calling newstack |
| // calling the scheduler calling newm calling gc), so we must |
| // record an argument size. For that purpose, it has no arguments. |
| TEXT runtime·morestack(SB),NOSPLIT,$-4-0 |
| // 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) |
| // newstack will fill gobuf.ctxt. |
| |
| // 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, -8(R29) // Zero saved LR in frame |
| ADDU $-8, R29 |
| MOVW REGCTXT, 4(R29) // ctxt argument |
| 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 reflect·call(SB),NOSPLIT,$0-20 |
| JMP ·reflectcall(SB) |
| |
| TEXT ·reflectcall(SB),NOSPLIT,$-4-20 |
| 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 $-4, R29 |
| NOR R0, R0 // prevent scheduling |
| MOVW 0(REGCTXT), R4 |
| JMP (R4) |
| |
| // Save state of caller into g->sched. Smashes R1. |
| TEXT gosave<>(SB),NOSPLIT,$-4 |
| 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(void (*fn)(void*), void *frame, uintptr framesize) |
| // Turn the fn into a Go func (by taking its address) and call |
| // cgocallback_gofunc. |
| TEXT runtime·cgocallback(SB),NOSPLIT,$16-16 |
| MOVW $fn+0(FP), R1 |
| MOVW R1, 4(R29) |
| MOVW frame+4(FP), R1 |
| MOVW R1, 8(R29) |
| MOVW framesize+8(FP), R1 |
| MOVW R1, 12(R29) |
| MOVW ctxt+12(FP), R1 |
| MOVW R1, 16(R29) |
| MOVW $runtime·cgocallback_gofunc(SB), R1 |
| JAL (R1) |
| RET |
| |
| // cgocallback_gofunc(FuncVal*, void *frame, uintptr framesize, uintptr ctxt) |
| // See cgocall.go for more details. |
| TEXT ·cgocallback_gofunc(SB),NOSPLIT,$8-16 |
| 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-8(SP) |
| 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 stack. |
| // This has the added benefit that it looks to the traceback |
| // routine like cgocallbackg is going to return to that |
| // PC (because the frame we allocate below has the same |
| // size as cgocallback_gofunc's frame declared above) |
| // so that the traceback will seamlessly trace back into |
| // the earlier calls. |
| // |
| // In the new goroutine, -4(SP) is unused (where SP refers to |
| // m->curg's SP while we're setting it up, before we've adjusted it). |
| 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(R2) |
| MOVW ctxt+12(FP), R1 |
| MOVW R1, -8(R2) |
| MOVW $-12(R2), 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(R29), R2 |
| 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-8(SP), R2 |
| 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·getcallerpc(SB),NOSPLIT,$4-8 |
| MOVW 8(R29), R1 // LR saved by caller |
| MOVW R1, ret+4(FP) |
| RET |
| |
| TEXT runtime·abort(SB),NOSPLIT,$0-0 |
| UNDEF |
| |
| // memhash_varlen(p unsafe.Pointer, h seed) uintptr |
| // redirects to memhash(p, h, size) using the size |
| // stored in the closure. |
| TEXT runtime·memhash_varlen(SB),NOSPLIT,$16-12 |
| GO_ARGS |
| NO_LOCAL_POINTERS |
| MOVW p+0(FP), R1 |
| MOVW h+4(FP), R2 |
| MOVW 4(REGCTXT), R3 |
| MOVW R1, 4(R29) |
| MOVW R2, 8(R29) |
| MOVW R3, 12(R29) |
| JAL runtime·memhash(SB) |
| MOVW 16(R29), R1 |
| MOVW R1, ret+8(FP) |
| RET |
| |
| // Not implemented. |
| TEXT runtime·aeshash(SB),NOSPLIT,$0 |
| UNDEF |
| |
| // Not implemented. |
| TEXT runtime·aeshash32(SB),NOSPLIT,$0 |
| UNDEF |
| |
| // Not implemented. |
| TEXT runtime·aeshash64(SB),NOSPLIT,$0 |
| UNDEF |
| |
| // Not implemented. |
| TEXT runtime·aeshashstr(SB),NOSPLIT,$0 |
| UNDEF |
| |
| // memequal(a, b unsafe.Pointer, size uintptr) bool |
| TEXT runtime·memequal(SB),NOSPLIT,$0-13 |
| MOVW a+0(FP), R1 |
| MOVW b+4(FP), R2 |
| BEQ R1, R2, eq |
| MOVW size+8(FP), R3 |
| ADDU R1, R3, R4 |
| loop: |
| BNE R1, R4, test |
| MOVW $1, R1 |
| MOVB R1, ret+12(FP) |
| RET |
| test: |
| MOVBU (R1), R6 |
| ADDU $1, R1 |
| MOVBU (R2), R7 |
| ADDU $1, R2 |
| BEQ R6, R7, loop |
| |
| MOVB R0, ret+12(FP) |
| RET |
| eq: |
| MOVW $1, R1 |
| MOVB R1, ret+12(FP) |
| RET |
| |
| // memequal_varlen(a, b unsafe.Pointer) bool |
| TEXT runtime·memequal_varlen(SB),NOSPLIT,$0-9 |
| MOVW a+0(FP), R1 |
| MOVW b+4(FP), R2 |
| BEQ R1, R2, eq |
| MOVW 4(REGCTXT), R3 // compiler stores size at offset 4 in the closure |
| ADDU R1, R3, R4 |
| loop: |
| BNE R1, R4, test |
| MOVW $1, R1 |
| MOVB R1, ret+8(FP) |
| RET |
| test: |
| MOVBU (R1), R6 |
| ADDU $1, R1 |
| MOVBU (R2), R7 |
| ADDU $1, R2 |
| BEQ R6, R7, loop |
| |
| MOVB R0, ret+8(FP) |
| RET |
| eq: |
| MOVW $1, R1 |
| MOVB R1, ret+8(FP) |
| RET |
| |
| // eqstring tests whether two strings are equal. |
| // The compiler guarantees that strings passed |
| // to eqstring have equal length. |
| // See runtime_test.go:eqstring_generic for |
| // equivalent Go code. |
| TEXT runtime·eqstring(SB),NOSPLIT,$0-17 |
| MOVW s1_base+0(FP), R1 |
| MOVW s2_base+8(FP), R2 |
| MOVW $1, R3 |
| MOVBU R3, ret+16(FP) |
| BNE R1, R2, 2(PC) |
| RET |
| MOVW s1_len+4(FP), R3 |
| ADDU R1, R3, R4 |
| loop: |
| BNE R1, R4, 2(PC) |
| RET |
| MOVBU (R1), R6 |
| ADDU $1, R1 |
| MOVBU (R2), R7 |
| ADDU $1, R2 |
| BEQ R6, R7, loop |
| MOVB R0, ret+16(FP) |
| RET |
| |
| TEXT bytes·Equal(SB),NOSPLIT,$0-25 |
| MOVW a_len+4(FP), R3 |
| MOVW b_len+16(FP), R4 |
| BNE R3, R4, noteq // unequal lengths are not equal |
| |
| MOVW a+0(FP), R1 |
| MOVW b+12(FP), R2 |
| ADDU R1, R3 // end |
| |
| loop: |
| BEQ R1, R3, equal // reached the end |
| MOVBU (R1), R6 |
| ADDU $1, R1 |
| MOVBU (R2), R7 |
| ADDU $1, R2 |
| BEQ R6, R7, loop |
| |
| noteq: |
| MOVB R0, ret+24(FP) |
| RET |
| |
| equal: |
| MOVW $1, R1 |
| MOVB R1, ret+24(FP) |
| RET |
| |
| TEXT bytes·IndexByte(SB),NOSPLIT,$0-20 |
| MOVW s+0(FP), R1 |
| MOVW s_len+4(FP), R2 |
| MOVBU c+12(FP), R3 // byte to find |
| ADDU $1, R1, R4 // store base+1 for later |
| ADDU R1, R2 // end |
| |
| loop: |
| BEQ R1, R2, notfound |
| MOVBU (R1), R5 |
| ADDU $1, R1 |
| BNE R3, R5, loop |
| |
| SUBU R4, R1 // R1 will be one beyond the position we want so remove (base+1) |
| MOVW R1, ret+16(FP) |
| RET |
| |
| notfound: |
| MOVW $-1, R1 |
| MOVW R1, ret+16(FP) |
| RET |
| |
| TEXT strings·IndexByte(SB),NOSPLIT,$0-16 |
| MOVW s_base+0(FP), R1 |
| MOVW s_len+4(FP), R2 |
| MOVBU c+8(FP), R3 // byte to find |
| ADDU $1, R1, R4 // store base+1 for later |
| ADDU R1, R2 // end |
| |
| loop: |
| BEQ R1, R2, notfound |
| MOVBU (R1), R5 |
| ADDU $1, R1 |
| BNE R3, R5, loop |
| |
| SUBU R4, R1 // remove (base+1) |
| MOVW R1, ret+12(FP) |
| RET |
| |
| notfound: |
| MOVW $-1, R1 |
| MOVW R1, ret+12(FP) |
| RET |
| |
| TEXT runtime·cmpstring(SB),NOSPLIT,$0-20 |
| MOVW s1_base+0(FP), R3 |
| MOVW s1_len+4(FP), R1 |
| MOVW s2_base+8(FP), R4 |
| MOVW s2_len+12(FP), R2 |
| BEQ R3, R4, samebytes |
| SGTU R1, R2, R7 |
| MOVW R1, R8 |
| CMOVN R7, R2, R8 // R8 is min(R1, R2) |
| |
| ADDU R3, R8 // R3 is current byte in s1, R8 is last byte in s1 to compare |
| loop: |
| BEQ R3, R8, samebytes // all compared bytes were the same; compare lengths |
| |
| MOVBU (R3), R6 |
| ADDU $1, R3 |
| MOVBU (R4), R7 |
| ADDU $1, R4 |
| BEQ R6, R7 , loop |
| // bytes differed |
| SGTU R6, R7, R8 |
| MOVW $-1, R6 |
| CMOVZ R8, R6, R8 |
| JMP cmp_ret |
| samebytes: |
| SGTU R1, R2, R6 |
| SGTU R2, R1, R7 |
| SUBU R7, R6, R8 |
| cmp_ret: |
| MOVW R8, ret+16(FP) |
| RET |
| |
| TEXT bytes·Compare(SB),NOSPLIT,$0-28 |
| MOVW s1_base+0(FP), R3 |
| MOVW s2_base+12(FP), R4 |
| MOVW s1_len+4(FP), R1 |
| MOVW s2_len+16(FP), R2 |
| BEQ R3, R4, samebytes |
| SGTU R1, R2, R7 |
| MOVW R1, R8 |
| CMOVN R7, R2, R8 // R8 is min(R1, R2) |
| |
| ADDU R3, R8 // R3 is current byte in s1, R8 is last byte in s1 to compare |
| loop: |
| BEQ R3, R8, samebytes |
| |
| MOVBU (R3), R6 |
| ADDU $1, R3 |
| MOVBU (R4), R7 |
| ADDU $1, R4 |
| BEQ R6, R7 , loop |
| |
| SGTU R6, R7, R8 |
| MOVW $-1, R6 |
| CMOVZ R8, R6, R8 |
| JMP cmp_ret |
| samebytes: |
| SGTU R1, R2, R6 |
| SGTU R2, R1, R7 |
| SUBU R7, R6, R8 |
| cmp_ret: |
| MOVW R8, ret+24(FP) |
| RET |
| |
| TEXT runtime·return0(SB),NOSPLIT,$0 |
| MOVW $0, R1 |
| RET |
| |
| // Called from cgo wrappers, this function returns g->m->curg.stack.hi. |
| // Must obey the gcc calling convention. |
| TEXT _cgo_topofstack(SB),NOSPLIT,$-4 |
| // 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,$-4-0 |
| 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 runtime·prefetcht0(SB),NOSPLIT,$0-4 |
| RET |
| |
| TEXT runtime·prefetcht1(SB),NOSPLIT,$0-4 |
| RET |
| |
| TEXT runtime·prefetcht2(SB),NOSPLIT,$0-4 |
| RET |
| |
| TEXT runtime·prefetchnta(SB),NOSPLIT,$0-4 |
| RET |
| |
| TEXT ·checkASM(SB),NOSPLIT,$0-1 |
| MOVW $1, R1 |
| MOVB R1, ret+0(FP) |
| RET |
