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go/src/runtime/asm_mips64x.s
Austin Clements 15d6ab69fb runtime: make systemstack tail call if already switched 
Currently systemstack always calls its argument, even if we're already
on the system stack. Unfortunately, traceback with _TraceJump stops at
the first systemstack it sees, which often cuts off runtime stacks
early in profiles.

Fix this by performing a tail call if we're already on the system
stack. This eliminates it from the traceback entirely, so it won't
stop prematurely (or all get mushed into a single node in the profile
graph).

Change-Id: Ibc69e8765e899f8d3806078517b8c7314da196f4
Reviewed-on: https://go-review.googlesource.com/74050
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
2017-10-30 16:33:55 +00:00

779 lines
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// 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.
// +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,$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 $-24, R29
MOVV R1, 16(R29)
MOVV R0, 8(R29)
MOVV R0, 0(R29)
JAL runtime·newproc(SB)
ADDV $24, R29
// start this M
JAL runtime·mstart(SB)
MOVV R0, 1(R0)
RET
DATA runtime·mainPC+0(SB)/8,$runtime·main(SB)
GLOBL runtime·mainPC(SB),RODATA,$8
TEXT runtime·breakpoint(SB),NOSPLIT,$-8-0
MOVV R0, 2(R0) // TODO: TD
RET
TEXT runtime·asminit(SB),NOSPLIT,$-8-0
RET
/*
* go-routine
*/
// void gosave(Gobuf*)
// save state in Gobuf; setjmp
TEXT runtime·gosave(SB), NOSPLIT, $-8-8
MOVV buf+0(FP), R1
MOVV R29, gobuf_sp(R1)
MOVV R31, gobuf_pc(R1)
MOVV g, gobuf_g(R1)
MOVV R0, gobuf_lr(R1)
MOVV R0, gobuf_ret(R1)
// Assert ctxt is zero. See func save.
MOVV 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, $16-8
MOVV buf+0(FP), R3
MOVV gobuf_g(R3), g // make sure g is not nil
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, $-8-8
// 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)
MOVV g, (g_sched+gobuf_g)(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)
switch:
// save our state in g->sched. Pretend to
// be systemstack_switch if the G stack is scanned.
MOVV $runtime·systemstack_switch(SB), R4
ADDV $8, R4 // get past prologue
MOVV R4, (g_sched+gobuf_pc)(g)
MOVV R29, (g_sched+gobuf_sp)(g)
MOVV R0, (g_sched+gobuf_lr)(g)
MOVV g, (g_sched+gobuf_g)(g)
// switch to g0
MOVV R3, g
JAL runtime·save_g(SB)
MOVV (g_sched+gobuf_sp)(g), R1
// make it look like mstart called systemstack on g0, to stop traceback
ADDV $-8, R1
MOVV $runtime·mstart(SB), R2
MOVV R2, 0(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 $8, R29
JMP (R4)
/*
* support for morestack
*/
// Called during function prolog when more stack is needed.
// Caller has already loaded:
// R1: framesize, R2: argsize, R3: LR
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must
// record an argument size. For that purpose, it has no arguments.
TEXT runtime·morestack(SB),NOSPLIT,$-8-0
// 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 $-8, R29
JAL runtime·newstack(SB)
// Not reached, but make sure the return PC from the call to newstack
// is still in this function, and not the beginning of the next.
UNDEF
TEXT runtime·morestack_noctxt(SB),NOSPLIT,$-8-0
MOVV 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.
// 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 reflect·call(SB), NOSPLIT, $0-0
JMP ·reflectcall(SB)
TEXT ·reflectcall(SB), NOSPLIT, $-8-32
MOVWU argsize+24(FP), R1
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-24; \
NO_LOCAL_POINTERS; \
/* copy arguments to stack */ \
MOVV arg+16(FP), R1; \
MOVWU argsize+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 argtype+0(FP), R5; \
MOVV arg+16(FP), R1; \
MOVWU n+24(FP), R2; \
MOVWU retoffset+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, $32-0
MOVV R5, 8(R29)
MOVV R1, 16(R29)
MOVV R3, 24(R29)
MOVV R2, 32(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
// 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, $-8-16
MOVV 0(R29), R31
ADDV $-8, R31
MOVV fv+0(FP), REGCTXT
MOVV argp+8(FP), R29
ADDV $-8, R29
NOR R0, R0 // prevent scheduling
MOVV 0(REGCTXT), R4
JMP (R4)
// Save state of caller into g->sched. Smashes R1.
TEXT gosave<>(SB),NOSPLIT,$-8
MOVV R31, (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·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,$0-20
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.
MOVV g_m(g), R5
MOVV m_g0(R5), R6
BEQ R6, g, g0
JAL gosave<>(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
// cgocallback(void (*fn)(void*), void *frame, uintptr framesize, uintptr ctxt)
// Turn the fn into a Go func (by taking its address) and call
// cgocallback_gofunc.
TEXT runtime·cgocallback(SB),NOSPLIT,$32-32
MOVV $fn+0(FP), R1
MOVV R1, 8(R29)
MOVV frame+8(FP), R1
MOVV R1, 16(R29)
MOVV framesize+16(FP), R1
MOVV R1, 24(R29)
MOVV ctxt+24(FP), R1
MOVV R1, 32(R29)
MOVV $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,$16-32
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-16(SP)
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 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, -8(SP) is unused (where SP refers to
// m->curg's SP while we're setting it up, before we've adjusted it).
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(R2)
MOVV ctxt+24(FP), R1
MOVV R1, -16(R2)
MOVV $-24(R2), 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(R29), R2
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-16(SP), R2
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,$0-0
MOVV R1, g
JAL runtime·save_g(SB)
RET
TEXT runtime·getcallerpc(SB),NOSPLIT,$-8-8
MOVV 0(R29), R1 // LR saved by caller
MOVV R1, ret+0(FP)
RET
TEXT runtime·abort(SB),NOSPLIT,$-8-0
MOVW (R0), R0
UNDEF
// AES hashing not implemented for mips64
TEXT runtime·aeshash(SB),NOSPLIT,$-8-0
MOVW (R0), R1
TEXT runtime·aeshash32(SB),NOSPLIT,$-8-0
MOVW (R0), R1
TEXT runtime·aeshash64(SB),NOSPLIT,$-8-0
MOVW (R0), R1
TEXT runtime·aeshashstr(SB),NOSPLIT,$-8-0
MOVW (R0), R1
// memequal(p, q unsafe.Pointer, size uintptr) bool
TEXT runtime·memequal(SB),NOSPLIT,$-8-25
MOVV a+0(FP), R1
MOVV b+8(FP), R2
BEQ R1, R2, eq
MOVV size+16(FP), R3
ADDV R1, R3, R4
loop:
BNE R1, R4, test
MOVV $1, R1
MOVB R1, ret+24(FP)
RET
test:
MOVBU (R1), R6
ADDV $1, R1
MOVBU (R2), R7
ADDV $1, R2
BEQ R6, R7, loop
MOVB R0, ret+24(FP)
RET
eq:
MOVV $1, R1
MOVB R1, ret+24(FP)
RET
// memequal_varlen(a, b unsafe.Pointer) bool
TEXT runtime·memequal_varlen(SB),NOSPLIT,$40-17
MOVV a+0(FP), R1
MOVV b+8(FP), R2
BEQ R1, R2, eq
MOVV 8(REGCTXT), R3 // compiler stores size at offset 8 in the closure
MOVV R1, 8(R29)
MOVV R2, 16(R29)
MOVV R3, 24(R29)
JAL runtime·memequal(SB)
MOVBU 32(R29), R1
MOVB R1, ret+16(FP)
RET
eq:
MOVV $1, R1
MOVB R1, ret+16(FP)
RET
// TODO: share code with memequal?
TEXT bytes·Equal(SB),NOSPLIT,$0-49
MOVV a_len+8(FP), R3
MOVV b_len+32(FP), R4
BNE R3, R4, noteq // unequal lengths are not equal
MOVV a+0(FP), R1
MOVV b+24(FP), R2
ADDV R1, R3 // end
loop:
BEQ R1, R3, equal // reached the end
MOVBU (R1), R6
ADDV $1, R1
MOVBU (R2), R7
ADDV $1, R2
BEQ R6, R7, loop
noteq:
MOVB R0, ret+48(FP)
RET
equal:
MOVV $1, R1
MOVB R1, ret+48(FP)
RET
TEXT bytes·IndexByte(SB),NOSPLIT,$0-40
MOVV s+0(FP), R1
MOVV s_len+8(FP), R2
MOVBU c+24(FP), R3 // byte to find
MOVV R1, R4 // store base for later
ADDV R1, R2 // end
ADDV $-1, R1
loop:
ADDV $1, R1
BEQ R1, R2, notfound
MOVBU (R1), R5
BNE R3, R5, loop
SUBV R4, R1 // remove base
MOVV R1, ret+32(FP)
RET
notfound:
MOVV $-1, R1
MOVV R1, ret+32(FP)
RET
TEXT strings·IndexByte(SB),NOSPLIT,$0-32
MOVV p+0(FP), R1
MOVV b_len+8(FP), R2
MOVBU c+16(FP), R3 // byte to find
MOVV R1, R4 // store base for later
ADDV R1, R2 // end
ADDV $-1, R1
loop:
ADDV $1, R1
BEQ R1, R2, notfound
MOVBU (R1), R5
BNE R3, R5, loop
SUBV R4, R1 // remove base
MOVV R1, ret+24(FP)
RET
notfound:
MOVV $-1, R1
MOVV R1, 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,$16
// g (R30) and REGTMP (R23) might be clobbered by load_g. They
// are callee-save in the gcc calling convention, so save them.
MOVV R23, savedR23-16(SP)
MOVV g, savedG-8(SP)
JAL runtime·load_g(SB)
MOVV g_m(g), R1
MOVV m_curg(R1), R1
MOVV (g_stack+stack_hi)(R1), R2 // return value in R2
MOVV savedG-8(SP), g
MOVV savedR23-16(SP), R23
RET
// The top-most function running on a goroutine
// returns to goexit+PCQuantum.
TEXT runtime·goexit(SB),NOSPLIT,$-8-0
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
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