// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build mips mipsle
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#include "go_asm.h"
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#include "go_tls.h"
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#include "funcdata.h"
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#include "textflag.h"
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#define REGCTXT R22
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TEXT runtime·rt0_go(SB),NOSPLIT,$0
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// R29 = stack; R4 = argc; R5 = argv
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ADDU $-12, R29
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MOVW R4, 4(R29) // argc
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MOVW R5, 8(R29) // argv
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// create istack out of the given (operating system) stack.
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// _cgo_init may update stackguard.
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MOVW $runtime·g0(SB), g
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MOVW $(-64*1024), R23
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ADD R23, R29, R1
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MOVW R1, g_stackguard0(g)
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MOVW R1, g_stackguard1(g)
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MOVW R1, (g_stack+stack_lo)(g)
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MOVW R29, (g_stack+stack_hi)(g)
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// if there is a _cgo_init, call it using the gcc ABI.
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MOVW _cgo_init(SB), R25
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BEQ R25, nocgo
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ADDU $-16, R29
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MOVW R0, R7 // arg 3: not used
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MOVW R0, R6 // arg 2: not used
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MOVW $setg_gcc<>(SB), R5 // arg 1: setg
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MOVW g, R4 // arg 0: G
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JAL (R25)
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ADDU $16, R29
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nocgo:
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// update stackguard after _cgo_init
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MOVW (g_stack+stack_lo)(g), R1
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ADD $const__StackGuard, R1
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MOVW R1, g_stackguard0(g)
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MOVW R1, g_stackguard1(g)
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// set the per-goroutine and per-mach "registers"
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MOVW $runtime·m0(SB), R1
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// save m->g0 = g0
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MOVW g, m_g0(R1)
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// save m0 to g0->m
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MOVW R1, g_m(g)
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JAL runtime·check(SB)
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// args are already prepared
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JAL runtime·args(SB)
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JAL runtime·osinit(SB)
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JAL runtime·schedinit(SB)
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// create a new goroutine to start program
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MOVW $runtime·mainPC(SB), R1 // entry
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ADDU $-12, R29
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MOVW R1, 8(R29)
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MOVW R0, 4(R29)
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MOVW R0, 0(R29)
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JAL runtime·newproc(SB)
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ADDU $12, R29
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// start this M
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JAL runtime·mstart(SB)
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UNDEF
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RET
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DATA runtime·mainPC+0(SB)/4,$runtime·main(SB)
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GLOBL runtime·mainPC(SB),RODATA,$4
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TEXT runtime·breakpoint(SB),NOSPLIT,$0-0
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BREAK
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RET
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TEXT runtime·asminit(SB),NOSPLIT,$0-0
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RET
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/*
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* go-routine
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*/
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// void gosave(Gobuf*)
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// save state in Gobuf; setjmp
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TEXT runtime·gosave(SB),NOSPLIT|NOFRAME,$0-4
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MOVW buf+0(FP), R1
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MOVW R29, gobuf_sp(R1)
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MOVW R31, gobuf_pc(R1)
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MOVW g, gobuf_g(R1)
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MOVW R0, gobuf_lr(R1)
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MOVW R0, gobuf_ret(R1)
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// Assert ctxt is zero. See func save.
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MOVW gobuf_ctxt(R1), R1
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BEQ R1, 2(PC)
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JAL runtime·badctxt(SB)
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RET
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// void gogo(Gobuf*)
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// restore state from Gobuf; longjmp
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TEXT runtime·gogo(SB),NOSPLIT,$8-4
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MOVW buf+0(FP), R3
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MOVW gobuf_g(R3), g // make sure g is not nil
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JAL runtime·save_g(SB)
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MOVW 0(g), R2
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MOVW gobuf_sp(R3), R29
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MOVW gobuf_lr(R3), R31
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MOVW gobuf_ret(R3), R1
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MOVW gobuf_ctxt(R3), REGCTXT
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MOVW R0, gobuf_sp(R3)
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MOVW R0, gobuf_ret(R3)
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MOVW R0, gobuf_lr(R3)
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MOVW R0, gobuf_ctxt(R3)
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MOVW gobuf_pc(R3), R4
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JMP (R4)
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// void mcall(fn func(*g))
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// Switch to m->g0's stack, call fn(g).
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// Fn must never return. It should gogo(&g->sched)
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// to keep running g.
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TEXT runtime·mcall(SB),NOSPLIT|NOFRAME,$0-4
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// Save caller state in g->sched
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MOVW R29, (g_sched+gobuf_sp)(g)
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MOVW R31, (g_sched+gobuf_pc)(g)
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MOVW R0, (g_sched+gobuf_lr)(g)
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MOVW g, (g_sched+gobuf_g)(g)
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// Switch to m->g0 & its stack, call fn.
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MOVW g, R1
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MOVW g_m(g), R3
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MOVW m_g0(R3), g
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JAL runtime·save_g(SB)
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BNE g, R1, 2(PC)
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JMP runtime·badmcall(SB)
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MOVW fn+0(FP), REGCTXT // context
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MOVW 0(REGCTXT), R4 // code pointer
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MOVW (g_sched+gobuf_sp)(g), R29 // sp = m->g0->sched.sp
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ADDU $-8, R29 // make room for 1 arg and fake LR
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MOVW R1, 4(R29)
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MOVW R0, 0(R29)
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JAL (R4)
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JMP runtime·badmcall2(SB)
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// systemstack_switch is a dummy routine that systemstack leaves at the bottom
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// of the G stack. We need to distinguish the routine that
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// lives at the bottom of the G stack from the one that lives
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// at the top of the system stack because the one at the top of
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// the system stack terminates the stack walk (see topofstack()).
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TEXT runtime·systemstack_switch(SB),NOSPLIT,$0-0
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UNDEF
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JAL (R31) // make sure this function is not leaf
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RET
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// func systemstack(fn func())
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TEXT runtime·systemstack(SB),NOSPLIT,$0-4
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MOVW fn+0(FP), R1 // R1 = fn
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MOVW R1, REGCTXT // context
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MOVW g_m(g), R2 // R2 = m
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MOVW m_gsignal(R2), R3 // R3 = gsignal
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BEQ g, R3, noswitch
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MOVW m_g0(R2), R3 // R3 = g0
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BEQ g, R3, noswitch
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MOVW m_curg(R2), R4
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BEQ g, R4, switch
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// Bad: g is not gsignal, not g0, not curg. What is it?
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// Hide call from linker nosplit analysis.
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MOVW $runtime·badsystemstack(SB), R4
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JAL (R4)
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JAL runtime·abort(SB)
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switch:
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// save our state in g->sched. Pretend to
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// be systemstack_switch if the G stack is scanned.
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MOVW $runtime·systemstack_switch(SB), R4
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ADDU $8, R4 // get past prologue
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MOVW R4, (g_sched+gobuf_pc)(g)
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MOVW R29, (g_sched+gobuf_sp)(g)
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MOVW R0, (g_sched+gobuf_lr)(g)
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MOVW g, (g_sched+gobuf_g)(g)
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// switch to g0
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MOVW R3, g
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JAL runtime·save_g(SB)
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MOVW (g_sched+gobuf_sp)(g), R1
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// make it look like mstart called systemstack on g0, to stop traceback
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ADDU $-4, R1
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MOVW $runtime·mstart(SB), R2
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MOVW R2, 0(R1)
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MOVW R1, R29
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// call target function
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MOVW 0(REGCTXT), R4 // code pointer
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JAL (R4)
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// switch back to g
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MOVW g_m(g), R1
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MOVW m_curg(R1), g
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JAL runtime·save_g(SB)
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MOVW (g_sched+gobuf_sp)(g), R29
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MOVW R0, (g_sched+gobuf_sp)(g)
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RET
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noswitch:
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// already on m stack, just call directly
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// Using a tail call here cleans up tracebacks since we won't stop
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// at an intermediate systemstack.
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MOVW 0(REGCTXT), R4 // code pointer
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MOVW 0(R29), R31 // restore LR
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ADD $4, R29
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JMP (R4)
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/*
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* support for morestack
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*/
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// Called during function prolog when more stack is needed.
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// Caller has already loaded:
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// R1: framesize, R2: argsize, R3: LR
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//
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// The traceback routines see morestack on a g0 as being
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// the top of a stack (for example, morestack calling newstack
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// calling the scheduler calling newm calling gc), so we must
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// record an argument size. For that purpose, it has no arguments.
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TEXT runtime·morestack(SB),NOSPLIT|NOFRAME,$0-0
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// Cannot grow scheduler stack (m->g0).
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MOVW g_m(g), R7
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MOVW m_g0(R7), R8
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BNE g, R8, 3(PC)
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JAL runtime·badmorestackg0(SB)
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JAL runtime·abort(SB)
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// Cannot grow signal stack (m->gsignal).
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MOVW m_gsignal(R7), R8
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BNE g, R8, 3(PC)
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JAL runtime·badmorestackgsignal(SB)
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JAL runtime·abort(SB)
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// Called from f.
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// Set g->sched to context in f.
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MOVW R29, (g_sched+gobuf_sp)(g)
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MOVW R31, (g_sched+gobuf_pc)(g)
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MOVW R3, (g_sched+gobuf_lr)(g)
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MOVW REGCTXT, (g_sched+gobuf_ctxt)(g)
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// Called from f.
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// Set m->morebuf to f's caller.
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MOVW R3, (m_morebuf+gobuf_pc)(R7) // f's caller's PC
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MOVW R29, (m_morebuf+gobuf_sp)(R7) // f's caller's SP
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MOVW g, (m_morebuf+gobuf_g)(R7)
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// Call newstack on m->g0's stack.
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MOVW m_g0(R7), g
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JAL runtime·save_g(SB)
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MOVW (g_sched+gobuf_sp)(g), R29
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// Create a stack frame on g0 to call newstack.
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MOVW R0, -4(R29) // Zero saved LR in frame
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ADDU $-4, R29
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JAL runtime·newstack(SB)
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// Not reached, but make sure the return PC from the call to newstack
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// is still in this function, and not the beginning of the next.
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UNDEF
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TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0-0
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MOVW R0, REGCTXT
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JMP runtime·morestack(SB)
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// reflectcall: call a function with the given argument list
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// func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32).
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// we don't have variable-sized frames, so we use a small number
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// of constant-sized-frame functions to encode a few bits of size in the pc.
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#define DISPATCH(NAME,MAXSIZE) \
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MOVW $MAXSIZE, R23; \
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SGTU R1, R23, R23; \
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BNE R23, 3(PC); \
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MOVW $NAME(SB), R4; \
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JMP (R4)
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TEXT ·reflectcall(SB),NOSPLIT|NOFRAME,$0-20
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MOVW argsize+12(FP), R1
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DISPATCH(runtime·call16, 16)
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DISPATCH(runtime·call32, 32)
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DISPATCH(runtime·call64, 64)
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DISPATCH(runtime·call128, 128)
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DISPATCH(runtime·call256, 256)
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DISPATCH(runtime·call512, 512)
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DISPATCH(runtime·call1024, 1024)
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DISPATCH(runtime·call2048, 2048)
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DISPATCH(runtime·call4096, 4096)
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DISPATCH(runtime·call8192, 8192)
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DISPATCH(runtime·call16384, 16384)
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DISPATCH(runtime·call32768, 32768)
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DISPATCH(runtime·call65536, 65536)
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DISPATCH(runtime·call131072, 131072)
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DISPATCH(runtime·call262144, 262144)
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DISPATCH(runtime·call524288, 524288)
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DISPATCH(runtime·call1048576, 1048576)
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DISPATCH(runtime·call2097152, 2097152)
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DISPATCH(runtime·call4194304, 4194304)
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DISPATCH(runtime·call8388608, 8388608)
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DISPATCH(runtime·call16777216, 16777216)
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DISPATCH(runtime·call33554432, 33554432)
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DISPATCH(runtime·call67108864, 67108864)
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DISPATCH(runtime·call134217728, 134217728)
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DISPATCH(runtime·call268435456, 268435456)
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DISPATCH(runtime·call536870912, 536870912)
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DISPATCH(runtime·call1073741824, 1073741824)
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MOVW $runtime·badreflectcall(SB), R4
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JMP (R4)
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#define CALLFN(NAME,MAXSIZE) \
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TEXT NAME(SB),WRAPPER,$MAXSIZE-20; \
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NO_LOCAL_POINTERS; \
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/* copy arguments to stack */ \
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MOVW arg+8(FP), R1; \
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MOVW argsize+12(FP), R2; \
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MOVW R29, R3; \
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ADDU $4, R3; \
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ADDU R3, R2; \
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BEQ R3, R2, 6(PC); \
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MOVBU (R1), R4; \
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ADDU $1, R1; \
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MOVBU R4, (R3); \
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ADDU $1, R3; \
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JMP -5(PC); \
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/* call function */ \
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MOVW f+4(FP), REGCTXT; \
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MOVW (REGCTXT), R4; \
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PCDATA $PCDATA_StackMapIndex, $0; \
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JAL (R4); \
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/* copy return values back */ \
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MOVW argtype+0(FP), R5; \
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MOVW arg+8(FP), R1; \
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MOVW n+12(FP), R2; \
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MOVW retoffset+16(FP), R4; \
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ADDU $4, R29, R3; \
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ADDU R4, R3; \
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ADDU R4, R1; \
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SUBU R4, R2; \
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JAL callRet<>(SB); \
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RET
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// callRet copies return values back at the end of call*. This is a
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// separate function so it can allocate stack space for the arguments
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// to reflectcallmove. It does not follow the Go ABI; it expects its
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// arguments in registers.
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TEXT callRet<>(SB), NOSPLIT, $16-0
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MOVW R5, 4(R29)
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MOVW R1, 8(R29)
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MOVW R3, 12(R29)
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MOVW R2, 16(R29)
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JAL runtime·reflectcallmove(SB)
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RET
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CALLFN(·call16, 16)
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CALLFN(·call32, 32)
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CALLFN(·call64, 64)
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CALLFN(·call128, 128)
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CALLFN(·call256, 256)
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CALLFN(·call512, 512)
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CALLFN(·call1024, 1024)
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CALLFN(·call2048, 2048)
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CALLFN(·call4096, 4096)
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CALLFN(·call8192, 8192)
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CALLFN(·call16384, 16384)
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CALLFN(·call32768, 32768)
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CALLFN(·call65536, 65536)
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CALLFN(·call131072, 131072)
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CALLFN(·call262144, 262144)
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CALLFN(·call524288, 524288)
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CALLFN(·call1048576, 1048576)
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CALLFN(·call2097152, 2097152)
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CALLFN(·call4194304, 4194304)
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CALLFN(·call8388608, 8388608)
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CALLFN(·call16777216, 16777216)
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CALLFN(·call33554432, 33554432)
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CALLFN(·call67108864, 67108864)
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CALLFN(·call134217728, 134217728)
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CALLFN(·call268435456, 268435456)
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CALLFN(·call536870912, 536870912)
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CALLFN(·call1073741824, 1073741824)
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TEXT runtime·procyield(SB),NOSPLIT,$0-4
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RET
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// void jmpdefer(fv, sp);
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// called from deferreturn.
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// 1. grab stored LR for caller
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// 2. sub 8 bytes to get back to JAL deferreturn
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// 3. JMP to fn
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TEXT runtime·jmpdefer(SB),NOSPLIT,$0-8
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MOVW 0(R29), R31
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ADDU $-8, R31
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MOVW fv+0(FP), REGCTXT
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MOVW argp+4(FP), R29
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ADDU $-4, R29
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NOR R0, R0 // prevent scheduling
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MOVW 0(REGCTXT), R4
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JMP (R4)
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// Save state of caller into g->sched. Smashes R1.
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TEXT gosave<>(SB),NOSPLIT|NOFRAME,$0
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MOVW R31, (g_sched+gobuf_pc)(g)
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MOVW R29, (g_sched+gobuf_sp)(g)
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MOVW R0, (g_sched+gobuf_lr)(g)
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MOVW R0, (g_sched+gobuf_ret)(g)
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// Assert ctxt is zero. See func save.
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MOVW (g_sched+gobuf_ctxt)(g), R1
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BEQ R1, 2(PC)
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JAL runtime·badctxt(SB)
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RET
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// func asmcgocall(fn, arg unsafe.Pointer) int32
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// Call fn(arg) on the scheduler stack,
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// aligned appropriately for the gcc ABI.
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// See cgocall.go for more details.
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TEXT ·asmcgocall(SB),NOSPLIT,$0-12
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MOVW fn+0(FP), R25
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MOVW arg+4(FP), R4
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MOVW R29, R3 // save original stack pointer
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MOVW g, R2
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// Figure out if we need to switch to m->g0 stack.
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// We get called to create new OS threads too, and those
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// come in on the m->g0 stack already.
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MOVW g_m(g), R5
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MOVW m_g0(R5), R6
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BEQ R6, g, g0
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JAL gosave<>(SB)
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MOVW R6, g
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JAL runtime·save_g(SB)
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MOVW (g_sched+gobuf_sp)(g), R29
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// Now on a scheduling stack (a pthread-created stack).
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g0:
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// Save room for two of our pointers and O32 frame.
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ADDU $-24, R29
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AND $~7, R29 // O32 ABI expects 8-byte aligned stack on function entry
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MOVW R2, 16(R29) // save old g on stack
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MOVW (g_stack+stack_hi)(R2), R2
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SUBU R3, R2
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MOVW R2, 20(R29) // save depth in old g stack (can't just save SP, as stack might be copied during a callback)
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JAL (R25)
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// Restore g, stack pointer. R2 is return value.
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MOVW 16(R29), g
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JAL runtime·save_g(SB)
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MOVW (g_stack+stack_hi)(g), R5
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MOVW 20(R29), R6
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SUBU R6, R5
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MOVW R5, R29
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MOVW R2, ret+8(FP)
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RET
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// cgocallback(void (*fn)(void*), void *frame, uintptr framesize)
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// Turn the fn into a Go func (by taking its address) and call
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// cgocallback_gofunc.
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TEXT runtime·cgocallback(SB),NOSPLIT,$16-16
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MOVW $fn+0(FP), R1
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MOVW R1, 4(R29)
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MOVW frame+4(FP), R1
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MOVW R1, 8(R29)
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MOVW framesize+8(FP), R1
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MOVW R1, 12(R29)
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MOVW ctxt+12(FP), R1
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MOVW R1, 16(R29)
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MOVW $runtime·cgocallback_gofunc(SB), R1
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JAL (R1)
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RET
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// cgocallback_gofunc(FuncVal*, void *frame, uintptr framesize, uintptr ctxt)
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// See cgocall.go for more details.
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TEXT ·cgocallback_gofunc(SB),NOSPLIT,$8-16
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NO_LOCAL_POINTERS
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// Load m and g from thread-local storage.
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MOVB runtime·iscgo(SB), R1
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BEQ R1, nocgo
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JAL runtime·load_g(SB)
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nocgo:
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// If g is nil, Go did not create the current thread.
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// Call needm to obtain one for temporary use.
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// In this case, we're running on the thread stack, so there's
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// lots of space, but the linker doesn't know. Hide the call from
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// the linker analysis by using an indirect call.
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BEQ g, needm
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MOVW g_m(g), R3
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MOVW R3, savedm-4(SP)
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JMP havem
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needm:
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MOVW g, savedm-4(SP) // g is zero, so is m.
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MOVW $runtime·needm(SB), R4
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JAL (R4)
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// Set m->sched.sp = SP, so that if a panic happens
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// during the function we are about to execute, it will
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// have a valid SP to run on the g0 stack.
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// The next few lines (after the havem label)
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// will save this SP onto the stack and then write
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// the same SP back to m->sched.sp. That seems redundant,
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// but if an unrecovered panic happens, unwindm will
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// restore the g->sched.sp from the stack location
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// and then systemstack will try to use it. If we don't set it here,
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// that restored SP will be uninitialized (typically 0) and
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// will not be usable.
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MOVW g_m(g), R3
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MOVW m_g0(R3), R1
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MOVW R29, (g_sched+gobuf_sp)(R1)
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havem:
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// Now there's a valid m, and we're running on its m->g0.
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// Save current m->g0->sched.sp on stack and then set it to SP.
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// Save current sp in m->g0->sched.sp in preparation for
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// switch back to m->curg stack.
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// NOTE: unwindm knows that the saved g->sched.sp is at 4(R29) aka savedsp-8(SP).
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MOVW m_g0(R3), R1
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MOVW (g_sched+gobuf_sp)(R1), R2
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MOVW R2, savedsp-8(SP)
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MOVW R29, (g_sched+gobuf_sp)(R1)
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// Switch to m->curg stack and call runtime.cgocallbackg.
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// Because we are taking over the execution of m->curg
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// but *not* resuming what had been running, we need to
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// save that information (m->curg->sched) so we can restore it.
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// We can restore m->curg->sched.sp easily, because calling
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// runtime.cgocallbackg leaves SP unchanged upon return.
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// To save m->curg->sched.pc, we push it onto the stack.
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// This has the added benefit that it looks to the traceback
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// 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·abort(SB),NOSPLIT,$0-0
|
UNDEF
|
|
// 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
|
|
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,$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
|
