mirror of
https://github.com/golang/go
synced 2024-11-18 08:54:45 -07:00
Runtime is now starting up with a dummy c program as target:
- morestack and gosave/gogo/gocall support - memclr and memset from inferno - bugfixes in _rt0_arm R=rsc APPROVED=rsc DELTA=304 (174 added, 36 deleted, 94 changed) OCL=30636 CL=30642
This commit is contained in:
Kai Backman
parent
b6ce2a72e1
commit
be639b9a51
@ -356,27 +356,26 @@ noops(void)
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p->link = q1;
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} else if (autosize < StackBig) {
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// split stack check for small functions
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// MOVW (REGG), R1
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// MOVW g_stackguard(g), R1
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// CMP R1, $-autosize(SP)
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// MOVW.W.LT R14,$-autosize(SP)
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// MOVW.W.GE R14,$-4(SP)
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// MOVW.GE $(args << 24 | autosize), R1
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// BL.GE callmorestack(SB)
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// MOVW.LT $args, R2
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// MOVW.W.LT R14, R3
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// BL.LT sys·morestackx(SB) // modifies LR
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// MOVW.W R14,$-autosize(SP)
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// TODO(kaib): double check we allocate autosize after
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// stack has been split
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// TODO(kaib): add error in case autosize doesn't pack
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// TODO(kaib): add more trampolines
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// TODO(kaib): put stackguard in register
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// TODO(kaib): add support for -K and underflow detection
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p = appendp(p); // load G.stackguard into R1
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// MOVW g_stackguard(g), R1
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p = appendp(p);
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p->as = AMOVW;
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p->from.type = D_OREG;
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p->from.reg = REGG;
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p->to.type = D_REG;
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p->to.reg = 1;
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// CMP R1, $-autosize(SP)
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p = appendp(p);
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p->as = ACMP;
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p->from.type = D_REG;
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@ -384,42 +383,41 @@ noops(void)
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p->from.offset = -autosize;
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p->reg = REGSP;
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// MOVW.LT $args, R2
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p = appendp(p);
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p->as = AMOVW;
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p->scond = C_SCOND_GE | C_WBIT;
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p->from.type = D_REG;
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p->from.reg = REGLINK;
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p->to.type = D_OREG;
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p->to.offset = -autosize;
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p->to.reg = REGSP;
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p = appendp(p);
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p->as = AMOVW;
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p->scond = C_SCOND_LT | C_WBIT;
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p->from.type = D_REG;
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p->from.reg = REGLINK;
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p->to.type = D_OREG;
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p->to.offset = -4;
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p->to.reg = REGSP;
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p = appendp(p); // packs args and autosize
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p->as = AMOVW;
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p->scond = C_SCOND_LT;
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p->from.type = D_CONST;
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// top 8 bits are arg count, lower 24 bits number of 4 byte
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// words
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p->from.offset =
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(curtext->to.offset2 & ~7) << 21 |
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(autosize & ~7) >> 3;
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p->from.offset = curtext->to.offset2 & ~7;
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p->to.type = D_REG;
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p->to.reg = 1;
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p->to.reg = 2;
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// MOVW.W.LT R14, R3
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p = appendp(p);
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p->as = AMOVW;
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p->scond = C_SCOND_LT;
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p->from.type = D_REG;
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p->from.reg = REGLINK;
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p->to.type = D_REG;
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p->to.reg = 3;
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// BL.LT sys·morestackx(SB) // modifies LR
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p = appendp(p);
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p->as = ABL;
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p->scond = C_SCOND_LT;
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p->to.type = D_BRANCH;
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p->to.sym = symmorestack;
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p->cond = pmorestack;
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// MOVW.W R14,$-autosize(SP)
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p = appendp(p);
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p->as = AMOVW;
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p->scond |= C_WBIT;
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p->from.type = D_REG;
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p->from.reg = REGLINK;
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p->to.type = D_OREG;
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p->to.offset = -autosize;
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p->to.reg = REGSP;
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} else { // > StackBig
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// MOVW.W R14,$-4(SP)
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// MOVW $(args << 24 | autosize), R1
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@ -10,7 +10,10 @@ SIZE=$(SIZE_$(GOARCH))
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# Setup CFLAGS. Add -D_64BIT on 64-bit platforms (sorry).
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CFLAGS_64=-D_64BIT
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CFLAGS=-I$(GOOS) -I$(GOOS)/$(GOARCH) -wF $(CFLAGS_$(SIZE))
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# TODO(kaib): fix register allocation to honor extern register so we
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# can enable optimizations again.
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CFLAGS_arm=-N
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CFLAGS=-I$(GOOS) -I$(GOOS)/$(GOARCH) -wF $(CFLAGS_$(SIZE)) $(CFLAGS_$(GOARCH))
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# Set O to right letter.
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O_386=8
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@ -33,6 +36,7 @@ OFILES_386=\
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# arm-specific object files
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OFILES_arm=\
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memset.$O\
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vlop.$O\
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vlrt.$O\
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@ -2,51 +2,55 @@
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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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TEXT _rt0_arm(SB),7,$0
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#include "arm/asm.h"
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// using frame size $-4 means do not save LR on stack.
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TEXT _rt0_arm(SB),7,$-4
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MOVW $setR12(SB), R12
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// copy arguments forward on an even stack
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MOVW 0(SP), R0 // argc
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MOVW 4(SP), R1 // argv
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SUB $128, SP // plenty of scratch
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AND $~7, SP
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MOVW R0, 120(SP) // save argc, argv away
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MOVW R1, 124(SP)
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// use R13 instead of SP to avoid linker rewriting the offsets
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MOVW 0(R13), R0 // argc
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MOVW $4(R13), R1 // argv
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SUB $128, R13 // plenty of scratch
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AND $~7, R13
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MOVW R0, 120(R13) // save argc, argv away
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MOVW R1, 124(R13)
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// set up m and g registers
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// g is R10, m is R9
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MOVW $g0(SB), R10
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MOVW $m0(SB), R9
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MOVW $g0(SB), g
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MOVW $m0(SB), m
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// save m->g0 = g0
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MOVW R10, 0(R9)
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MOVW g, m_g0(m)
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// create istack out of the OS stack
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MOVW $(-8192+104)(SP), R0
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MOVW R0, 0(R10) // 0(g) is stack limit (w 104b guard)
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MOVW SP, 4(R10) // 4(g) is base
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MOVW $(-8192+104)(R13), R0
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MOVW R0, g_stackguard(g) // (w 104b guard)
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MOVW R13, g_stackbase(g)
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BL emptyfunc(SB) // fault if stack check is wrong
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BL check(SB)
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// saved argc, argv
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MOVW 120(SP), R0
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MOVW R0, 0(SP)
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MOVW 124(SP), R0
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MOVW R0, 4(SP)
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MOVW 120(R13), R0
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MOVW R0, 4(R13)
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MOVW 124(R13), R1
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MOVW R1, 8(R13)
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BL args(SB)
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BL osinit(SB)
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BL schedinit(SB)
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// create a new goroutine to start program
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MOVW $mainstart(SB), R0
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MOVW.W R0, -4(SP)
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MOVW.W R0, -4(R13)
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MOVW $8, R0
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MOVW.W R0, -4(SP)
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MOVW.W R0, -4(R13)
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MOVW $0, R0
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MOVW.W R0, -4(SP) // push $0 as guard
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MOVW.W R0, -4(R13) // push $0 as guard
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BL sys·newproc(SB)
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MOVW $12(SP), SP // pop args and LR
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MOVW $12(R13), R13 // pop args and LR
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// start this M
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BL mstart(SB)
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@ -70,73 +74,106 @@ TEXT mainstart(SB),7,$0
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// TODO(kaib): remove these once linker works properly
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// pull in dummy dependencies
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TEXT _dep_dummy(SB),7,$0
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BL sys·morestack(SB)
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BL sys·morestackx(SB)
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BL _div(SB)
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BL _divu(SB)
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BL _mod(SB)
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BL _modu(SB)
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BL _modu(SB)
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TEXT breakpoint(SB),7,$0
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BL abort(SB)
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// BYTE $0xcc
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// RET
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// go-routine
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TEXT gogo(SB), 7, $0
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BL abort(SB)
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// MOVL 4(SP), AX // gobuf
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// MOVL 0(AX), SP // restore SP
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// MOVL 4(AX), AX
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// MOVL AX, 0(SP) // put PC on the stack
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// MOVL $1, AX
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// RET
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/*
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* go-routine
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*/
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// uintptr gosave(Gobuf*)
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// save state in Gobuf; setjmp
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TEXT gosave(SB), 7, $0
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BL abort(SB)
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// MOVL 4(SP), AX // gobuf
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// MOVL SP, 0(AX) // save SP
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// MOVL 0(SP), BX
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// MOVL BX, 4(AX) // save PC
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// MOVL $0, AX // return 0
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// RET
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MOVW SP, gobuf_sp(R0)
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MOVW LR, gobuf_pc(R0)
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MOVW g, gobuf_g(R0)
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MOVW $0, R0 // return 0
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RET
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// support for morestack
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// return point when leaving new stack.
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// save R0, jmp to lesstack to switch back
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TEXT retfromnewstack(SB),7,$0
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MOVW R0,12(R9) // m->cret
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B lessstack(SB)
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// gogo, returning 2nd arg instead of 1
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TEXT gogoret(SB), 7, $0
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// void gogo(Gobuf*, uintptr)
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// restore state from Gobuf; longjmp
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TEXT gogo(SB), 7, $0
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MOVW R0, R1 // gobuf
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MOVW 8(SP), R0 // return 2nd arg
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MOVW 4(SP), R1 // gobuf
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MOVW 0(R1), SP // restore SP
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MOVW 4(R1), PC // restore PC
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MOVW gobuf_g(R1), g
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MOVW 0(g), R2 // make sure g != nil
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MOVW gobuf_sp(R1), SP // restore SP
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MOVW gobuf_pc(R1), PC
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TEXT setspgoto(SB), 7, $0
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MOVW 4(SP), R0 // SP
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MOVW 8(SP), R1 // fn to call
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MOVW 12(SP), R2 // fn to return into
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MOVW R2, R14 // restore LR
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MOVW R0, SP
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MOVW R1, PC // goto
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// void gogocall(Gobuf*, void (*fn)(void))
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// restore state from Gobuf but then call fn.
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// (call fn, returning to state in Gobuf)
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// TODO(kaib): add R0 to gobuf so it can be restored properly
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// using frame size $-4 means do not save LR on stack.
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TEXT gogocall(SB), 7, $-4
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MOVW 8(SP), R1 // fn
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MOVW gobuf_g(R0), g
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MOVW 0(g), R2 // make sure g != nil
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MOVW gobuf_sp(R0), SP // restore SP
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MOVW gobuf_pc(R0), LR
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MOVW R1, PC
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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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// R1 frame size
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// R2 arg size
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// R3 prolog's LR
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// using frame size $-4 means do not save LR on stack.
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TEXT sys·morestack(SB),7,$-4
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// Cannot grow scheduler stack (m->g0).
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MOVW m_g0(m), R4
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CMP g, R4
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BNE 2(PC)
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BL abort(SB)
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// Save in m.
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MOVW R1, m_moreframe(m)
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MOVW R2, m_moreargs(m)
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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)(m) // f's caller's PC
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MOVW SP, (m_morebuf+gobuf_sp)(m) // f's caller's SP
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MOVW g, (m_morebuf+gobuf_g)(m)
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// Set m->morepc to f's PC.
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MOVW LR, m_morepc(m)
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// Call newstack on m's scheduling stack.
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MOVW m_g0(m), g
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MOVW (m_sched+gobuf_sp)(m), SP
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B newstack(SB)
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// Return point when leaving stack.
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// using frame size $-4 means do not save LR on stack.
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TEXT sys·lessstack(SB), 7, $-4
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// Save return value in m->cret
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MOVW R0, m_cret(m)
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// Call oldstack on m's scheduling stack.
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MOVW m_g0(m), g
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MOVW (m_sched+gobuf_sp)(m), SP
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B oldstack(SB)
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// Optimization to make inline stack splitting code smaller
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// R0 is original first argument
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// R1 is arg_num << 24 | autosize >> 3
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TEXT sys·morestackx(SB), 7, $0
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MOVW R0, 4(SP) // Save arg0
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MOVW R1<<8, R2
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MOVW R2>>5, R2
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MOVW R2, 4(R10) // autooffset into g
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MOVW R1>>24, R2
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MOVW R2<<3, R2
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MOVW R2, 8(R10) // argsize into g
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// R2 is argsize
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// R3 is LR for f (f's caller's PC)
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// using frame size $-4 means do not save LR on stack.
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TEXT sys·morestackx(SB), 7, $-4
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MOVW R0, 0(FP) // Save arg0
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MOVW $0, R1 // set frame size
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B sys·morestack(SB)
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// bool cas(int32 *val, int32 old, int32 new)
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@ -180,17 +217,18 @@ TEXT jmpdefer(SB), 7, $0
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// SUBL $5, (SP) // return to CALL again
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// JMP AX // but first run the deferred function
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TEXT sys·memclr(SB),7,$0
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BL abort(SB)
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// MOVL 4(SP), DI // arg 1 addr
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// MOVL 8(SP), CX // arg 2 count
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// ADDL $3, CX
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// SHRL $2, CX
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// MOVL $0, AX
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// CLD
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// REP
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// STOSL
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// RET
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TEXT sys·memclr(SB),7,$20
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// R0 = addr and passes implicitly to memset
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MOVW $0, R1 // c = 0
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MOVW R1, -16(SP)
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MOVW 4(FP), R1 // n
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MOVW R1, -12(SP)
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MOVW m, -8(SP) // Save m and g
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MOVW g, -4(SP)
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BL memset(SB)
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MOVW -8(SP), m // Restore m and g, memset clobbers them
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MOVW -4(SP), g
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RET
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TEXT sys·getcallerpc+0(SB),7,$0
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BL abort(SB)
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94
src/pkg/runtime/arm/memset.s
Normal file
94
src/pkg/runtime/arm/memset.s
Normal file
@ -0,0 +1,94 @@
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// Inferno's libkern/memset-arm.s
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// http://code.google.com/p/inferno-os/source/browse/libkern/memset-arm.s
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//
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// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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// Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
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||||
// Portions Copyright 2009 The Go Authors. All rights reserved.
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//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
// of this software and associated documentation files (the "Software"), to deal
|
||||
// in the Software without restriction, including without limitation the rights
|
||||
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
// copies of the Software, and to permit persons to whom the Software is
|
||||
// furnished to do so, subject to the following conditions:
|
||||
//
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||||
// The above copyright notice and this permission notice shall be included in
|
||||
// all copies or substantial portions of the Software.
|
||||
//
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||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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TO = 1
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TOE = 2
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N = 3
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TMP = 3 /* N and TMP don't overlap */
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// TODO(kaib): memset clobbers R9 and R10 (m and g). This makes the
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// registers unpredictable if (when) memset SIGSEGV's. Fix it by
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// moving the R4-R11 register bank.
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TEXT memset(SB), $0
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MOVW R0, R(TO)
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MOVW data+4(FP), R(4)
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MOVW n+8(FP), R(N)
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ADD R(N), R(TO), R(TOE) /* to end pointer */
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CMP $4, R(N) /* need at least 4 bytes to copy */
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BLT _1tail
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AND $0xFF, R(4) /* it's a byte */
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SLL $8, R(4), R(TMP) /* replicate to a word */
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ORR R(TMP), R(4)
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SLL $16, R(4), R(TMP)
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ORR R(TMP), R(4)
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_4align: /* align on 4 */
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AND.S $3, R(TO), R(TMP)
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BEQ _4aligned
|
||||
|
||||
MOVBU.P R(4), 1(R(TO)) /* implicit write back */
|
||||
B _4align
|
||||
|
||||
_4aligned:
|
||||
SUB $31, R(TOE), R(TMP) /* do 32-byte chunks if possible */
|
||||
CMP R(TMP), R(TO)
|
||||
BHS _4tail
|
||||
|
||||
MOVW R4, R5 /* replicate */
|
||||
MOVW R4, R6
|
||||
MOVW R4, R7
|
||||
MOVW R4, R8
|
||||
MOVW R4, R9
|
||||
MOVW R4, R10
|
||||
MOVW R4, R11
|
||||
|
||||
_f32loop:
|
||||
CMP R(TMP), R(TO)
|
||||
BHS _4tail
|
||||
|
||||
MOVM.IA.W [R4-R11], (R(TO))
|
||||
B _f32loop
|
||||
|
||||
_4tail:
|
||||
SUB $3, R(TOE), R(TMP) /* do remaining words if possible */
|
||||
_4loop:
|
||||
CMP R(TMP), R(TO)
|
||||
BHS _1tail
|
||||
|
||||
MOVW.P R(4), 4(R(TO)) /* implicit write back */
|
||||
B _4loop
|
||||
|
||||
_1tail:
|
||||
CMP R(TO), R(TOE)
|
||||
BEQ _return
|
||||
|
||||
MOVBU.P R(4), 1(R(TO)) /* implicit write back */
|
||||
B _1tail
|
||||
|
||||
_return:
|
||||
RET
|
||||
@ -6,23 +6,28 @@
|
||||
// System calls and other sys.stuff for arm, Linux
|
||||
//
|
||||
|
||||
#define SYS_BASE 0x00900000
|
||||
#define SYS_exit (SYS_BASE + 1)
|
||||
#define SYS_write (SYS_BASE + 4)
|
||||
#define SYS_mmap2 (SYS_BASE + 192)
|
||||
|
||||
TEXT write(SB),7,$0
|
||||
MOVW 8(SP), R1
|
||||
MOVW 12(SP), R2
|
||||
SWI $0x00900004 // syscall write
|
||||
SWI $SYS_write
|
||||
RET
|
||||
|
||||
TEXT exit(SB),7,$0
|
||||
SWI $0x00900001 // exit value in R0
|
||||
|
||||
TEXT sys·write(SB),7,$0
|
||||
MOVW 8(SP), R1
|
||||
MOVW 12(SP), R2
|
||||
SWI $0x00900004 // syscall write
|
||||
RET
|
||||
// Exit value already in R0
|
||||
SWI $SYS_exit
|
||||
|
||||
TEXT sys·mmap(SB),7,$0
|
||||
BL abort(SB)
|
||||
MOVW 4(FP), R1
|
||||
MOVW 8(FP), R2
|
||||
MOVW 12(FP), R3
|
||||
MOVW 16(FP), R4
|
||||
MOVW 20(FP), R5
|
||||
SWI $SYS_mmap2
|
||||
RET
|
||||
|
||||
// int64 futex(int32 *uaddr, int32 op, int32 val,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user