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// Copyright 2009 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.
//
// System calls and other sys.stuff for arm, Linux
//
#include "arm/asm.h"
// OABI
//#define SYS_BASE 0x00900000
// EABI
#define SYS_BASE 0x0
#define SYS_exit (SYS_BASE + 1)
#define SYS_write (SYS_BASE + 4)
#define SYS_gettimeofday (SYS_BASE + 78)
#define SYS_clone (SYS_BASE + 120)
#define SYS_rt_sigreturn (SYS_BASE + 173)
#define SYS_rt_sigaction (SYS_BASE + 174)
#define SYS_sigaltstack (SYS_BASE + 186)
#define SYS_mmap2 (SYS_BASE + 192)
#define SYS_futex (SYS_BASE + 240)
#define SYS_exit_group (SYS_BASE + 248)
#define SYS_munmap (SYS_BASE + 91)
#define SYS_setitimer (SYS_BASE + 104)
#define SYS_mincore (SYS_BASE + 219)
#define SYS_gettid (SYS_BASE + 224)
#define SYS_tkill (SYS_BASE + 238)
#define ARM_BASE (SYS_BASE + 0x0f0000)
#define SYS_ARM_cacheflush (ARM_BASE + 2)
TEXT runtime·write(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW $SYS_write, R7
SWI $0
RET
TEXT runtime·exit(SB),7,$-4
MOVW 0(FP), R0
MOVW $SYS_exit_group, R7
SWI $0
MOVW $1234, R0
MOVW $1002, R1
MOVW R0, (R1) // fail hard
TEXT runtime·exit1(SB),7,$-4
MOVW 0(FP), R0
MOVW $SYS_exit, R7
SWI $0
MOVW $1234, R0
MOVW $1003, R1
MOVW R0, (R1) // fail hard
TEXT runtime·raisesigpipe(SB),7,$-4
MOVW $SYS_gettid, R7
SWI $0
// arg 1 tid already in R0 from gettid
MOVW $13, R1 // arg 2 SIGPIPE
MOVW $SYS_tkill, R7
SWI $0
RET
TEXT runtime·mmap(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW 12(FP), R3
MOVW 16(FP), R4
MOVW 20(FP), R5
MOVW $SYS_mmap2, R7
SWI $0
RET
TEXT runtime·munmap(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW $SYS_munmap, R7
SWI $0
RET
TEXT runtime·setitimer(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW $SYS_setitimer, R7
SWI $0
RET
TEXT runtime·mincore(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW $SYS_mincore, R7
SWI $0
RET
TEXT runtime·gettime(SB),7,$32
/* dummy version - return 0,0 */
MOVW $0, R1
MOVW 0(FP), R0
MOVW R1, 0(R0)
MOVW R1, 4(R0)
MOVW 4(FP), R0
MOVW R1, 0(R0)
/*
attempt at real version - seg faults
MOVW $8(SP), R0
MOVW $0, R1
MOVW $SYS_gettimeofday, R7
SWI $0
MOVW 0(FP), R0 // sec
MOVW 8(SP), R1
MOVW R1, 0(R0)
MOVW 4(FP), R0 // usec
MOVW 12(SP), R1
MOVW R1, 0(R0)
*/
RET
// int32 futex(int32 *uaddr, int32 op, int32 val,
// struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT runtime·futex(SB),7,$0
MOVW 4(SP), R0
MOVW 8(SP), R1
MOVW 12(SP), R2
MOVW 16(SP), R3
MOVW 20(SP), R4
MOVW 24(SP), R5
MOVW $SYS_futex, R7
SWI $0
RET
// int32 clone(int32 flags, void *stack, M *m, G *g, void (*fn)(void));
TEXT runtime·clone(SB),7,$0
MOVW flags+0(FP), R0
MOVW stack+4(FP), R1
MOVW $0, R2 // parent tid ptr
MOVW $0, R3 // tls_val
MOVW $0, R4 // child tid ptr
MOVW $0, R5
// Copy m, g, fn off parent stack for use by child.
// TODO(kaib): figure out which registers are clobbered by clone and avoid stack copying
MOVW $-16(R1), R1
MOVW mm+8(FP), R6
MOVW R6, 0(R1)
MOVW gg+12(FP), R6
MOVW R6, 4(R1)
MOVW fn+16(FP), R6
MOVW R6, 8(R1)
MOVW $1234, R6
MOVW R6, 12(R1)
MOVW $SYS_clone, R7
SWI $0
// In parent, return.
CMP $0, R0
BEQ 2(PC)
RET
// Paranoia: check that SP is as we expect. Use R13 to avoid linker 'fixup'
MOVW 12(R13), R0
MOVW $1234, R1
CMP R0, R1
BEQ 2(PC)
BL runtime·abort(SB)
MOVW 0(R13), m
MOVW 4(R13), g
// paranoia; check they are not nil
MOVW 0(m), R0
MOVW 0(g), R0
BL runtime·emptyfunc(SB) // fault if stack check is wrong
// Initialize m->procid to Linux tid
MOVW $SYS_gettid, R7
SWI $0
MOVW R0, m_procid(m)
// Call fn
MOVW 8(R13), R0
MOVW $16(R13), R13
BL (R0)
MOVW $0, R0
MOVW R0, 4(R13)
BL runtime·exit1(SB)
// It shouldn't return
MOVW $1234, R0
MOVW $1005, R1
MOVW R0, (R1)
TEXT runtime·cacheflush(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW $0, R2
MOVW $SYS_ARM_cacheflush, R7
SWI $0
RET
TEXT runtime·sigaltstack(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW $SYS_sigaltstack, R7
SWI $0
RET
TEXT runtime·sigignore(SB),7,$0
RET
TEXT runtime·sigtramp(SB),7,$24
// save g
MOVW g, R3
MOVW g, 20(R13)
// g = m->gsignal
MOVW m_gsignal(m), g
// copy arguments for call to sighandler
MOVW R0, 4(R13)
MOVW R1, 8(R13)
MOVW R2, 12(R13)
MOVW R3, 16(R13)
BL runtime·sighandler(SB)
// restore g
MOVW 20(R13), g
RET
TEXT runtime·rt_sigaction(SB),7,$0
MOVW 0(FP), R0
MOVW 4(FP), R1
MOVW 8(FP), R2
MOVW 12(FP), R3
MOVW $SYS_rt_sigaction, R7
SWI $0
RET
TEXT runtime·sigreturn(SB),7,$0
MOVW $SYS_rt_sigreturn, R7
SWI $0
RET
// Use kernel version instead of native armcas in ../../arm.s.
// See ../../../sync/atomic/asm_linux_arm.s for details.
TEXT cas<>(SB),7,$0
MOVW $0xffff0fc0, PC
TEXT runtime·cas(SB),7,$0
MOVW valptr+0(FP), R2
MOVW old+4(FP), R0
casagain:
MOVW new+8(FP), R1
BL cas<>(SB)
BCC cascheck
MOVW $1, R0
RET
cascheck:
// Kernel lies; double-check.
MOVW valptr+0(FP), R2
MOVW old+4(FP), R0
MOVW 0(R2), R3
CMP R0, R3
BEQ casagain
MOVW $0, R0
RET
TEXT runtime·casp(SB),7,$0
B runtime·cas(SB)