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go/src/runtime/sys_linux_ppc64x.s
Michael Pratt 4bb45f7549 runtime: mark sigtramp as TOPFRAME 
Currently throw() in the signal handler results in "fatal error: unknown
return pc from runtime.sigreturn ...".

Marking sigtramp as TOPFRAME allows gentraceback to stop tracebacks at
the end of a signal handler, since there is not much beyond sigtramp.

This is just done on Linux for now, but may apply to other Unix systems
as well.

Change-Id: I96edcb945283f417a5bfe00ce2fb2b1a0d578692
Reviewed-on: https://go-review.googlesource.com/c/go/+/402190
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
2022-04-28 16:29:07 +00:00

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// Copyright 2014 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.
//go:build linux && (ppc64 || ppc64le)
//
// System calls and other sys.stuff for ppc64, Linux
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "asm_ppc64x.h"
#define SYS_exit 1
#define SYS_read 3
#define SYS_write 4
#define SYS_open 5
#define SYS_close 6
#define SYS_getpid 20
#define SYS_kill 37
#define SYS_brk 45
#define SYS_fcntl 55
#define SYS_mmap 90
#define SYS_munmap 91
#define SYS_setitimer 104
#define SYS_clone 120
#define SYS_sched_yield 158
#define SYS_nanosleep 162
#define SYS_rt_sigreturn 172
#define SYS_rt_sigaction 173
#define SYS_rt_sigprocmask 174
#define SYS_sigaltstack 185
#define SYS_madvise 205
#define SYS_mincore 206
#define SYS_gettid 207
#define SYS_futex 221
#define SYS_sched_getaffinity 223
#define SYS_exit_group 234
#define SYS_epoll_create 236
#define SYS_epoll_ctl 237
#define SYS_epoll_wait 238
#define SYS_timer_create 240
#define SYS_timer_settime 241
#define SYS_timer_delete 244
#define SYS_clock_gettime 246
#define SYS_tgkill 250
#define SYS_epoll_create1 315
#define SYS_pipe2 317
TEXT runtime·exit(SB),NOSPLIT|NOFRAME,$0-4
MOVW code+0(FP), R3
SYSCALL $SYS_exit_group
RET
// func exitThread(wait *uint32)
TEXT runtime·exitThread(SB),NOSPLIT|NOFRAME,$0-8
MOVD wait+0(FP), R1
// We're done using the stack.
MOVW $0, R2
SYNC
MOVW R2, (R1)
MOVW $0, R3 // exit code
SYSCALL $SYS_exit
JMP 0(PC)
TEXT runtime·open(SB),NOSPLIT|NOFRAME,$0-20
MOVD name+0(FP), R3
MOVW mode+8(FP), R4
MOVW perm+12(FP), R5
SYSCALL $SYS_open
BVC 2(PC)
MOVW $-1, R3
MOVW R3, ret+16(FP)
RET
TEXT runtime·closefd(SB),NOSPLIT|NOFRAME,$0-12
MOVW fd+0(FP), R3
SYSCALL $SYS_close
BVC 2(PC)
MOVW $-1, R3
MOVW R3, ret+8(FP)
RET
TEXT runtime·write1(SB),NOSPLIT|NOFRAME,$0-28
MOVD fd+0(FP), R3
MOVD p+8(FP), R4
MOVW n+16(FP), R5
SYSCALL $SYS_write
BVC 2(PC)
NEG R3 // caller expects negative errno
MOVW R3, ret+24(FP)
RET
TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
MOVW fd+0(FP), R3
MOVD p+8(FP), R4
MOVW n+16(FP), R5
SYSCALL $SYS_read
BVC 2(PC)
NEG R3 // caller expects negative errno
MOVW R3, ret+24(FP)
RET
// func pipe2(flags int32) (r, w int32, errno int32)
TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
ADD $FIXED_FRAME+8, R1, R3
MOVW flags+0(FP), R4
SYSCALL $SYS_pipe2
MOVW R3, errno+16(FP)
RET
TEXT runtime·usleep(SB),NOSPLIT,$16-4
MOVW usec+0(FP), R3
MOVD R3, R5
MOVW $1000000, R4
DIVD R4, R3
MOVD R3, 8(R1)
MOVW $1000, R4
MULLD R3, R4
SUB R4, R5
MOVD R5, 16(R1)
// nanosleep(&ts, 0)
ADD $8, R1, R3
MOVW $0, R4
SYSCALL $SYS_nanosleep
RET
TEXT runtime·gettid(SB),NOSPLIT,$0-4
SYSCALL $SYS_gettid
MOVW R3, ret+0(FP)
RET
TEXT runtime·raise(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_getpid
MOVW R3, R14
SYSCALL $SYS_gettid
MOVW R3, R4 // arg 2 tid
MOVW R14, R3 // arg 1 pid
MOVW sig+0(FP), R5 // arg 3
SYSCALL $SYS_tgkill
RET
TEXT runtime·raiseproc(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_getpid
MOVW R3, R3 // arg 1 pid
MOVW sig+0(FP), R4 // arg 2
SYSCALL $SYS_kill
RET
TEXT ·getpid(SB),NOSPLIT|NOFRAME,$0-8
SYSCALL $SYS_getpid
MOVD R3, ret+0(FP)
RET
TEXT ·tgkill(SB),NOSPLIT|NOFRAME,$0-24
MOVD tgid+0(FP), R3
MOVD tid+8(FP), R4
MOVD sig+16(FP), R5
SYSCALL $SYS_tgkill
RET
TEXT runtime·setitimer(SB),NOSPLIT|NOFRAME,$0-24
MOVW mode+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
SYSCALL $SYS_setitimer
RET
TEXT runtime·timer_create(SB),NOSPLIT,$0-28
MOVW clockid+0(FP), R3
MOVD sevp+8(FP), R4
MOVD timerid+16(FP), R5
SYSCALL $SYS_timer_create
MOVW R3, ret+24(FP)
RET
TEXT runtime·timer_settime(SB),NOSPLIT,$0-28
MOVW timerid+0(FP), R3
MOVW flags+4(FP), R4
MOVD new+8(FP), R5
MOVD old+16(FP), R6
SYSCALL $SYS_timer_settime
MOVW R3, ret+24(FP)
RET
TEXT runtime·timer_delete(SB),NOSPLIT,$0-12
MOVW timerid+0(FP), R3
SYSCALL $SYS_timer_delete
MOVW R3, ret+8(FP)
RET
TEXT runtime·mincore(SB),NOSPLIT|NOFRAME,$0-28
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVD dst+16(FP), R5
SYSCALL $SYS_mincore
NEG R3 // caller expects negative errno
MOVW R3, ret+24(FP)
RET
// func walltime() (sec int64, nsec int32)
TEXT runtime·walltime(SB),NOSPLIT,$16-12
MOVD R1, R15 // R15 is unchanged by C code
MOVD g_m(g), R21 // R21 = m
MOVD $0, R3 // CLOCK_REALTIME
MOVD runtime·vdsoClockgettimeSym(SB), R12 // Check for VDSO availability
CMP R12, R0
BEQ fallback
// Set vdsoPC and vdsoSP for SIGPROF traceback.
// Save the old values on stack and restore them on exit,
// so this function is reentrant.
MOVD m_vdsoPC(R21), R4
MOVD m_vdsoSP(R21), R5
MOVD R4, 32(R1)
MOVD R5, 40(R1)
MOVD LR, R14
MOVD $ret-FIXED_FRAME(FP), R5 // caller's SP
MOVD R14, m_vdsoPC(R21)
MOVD R5, m_vdsoSP(R21)
MOVD m_curg(R21), R6
CMP g, R6
BNE noswitch
MOVD m_g0(R21), R7
MOVD (g_sched+gobuf_sp)(R7), R1 // Set SP to g0 stack
noswitch:
SUB $16, R1 // Space for results
RLDICR $0, R1, $59, R1 // Align for C code
MOVD R12, CTR
MOVD R1, R4
// Store g on gsignal's stack, so if we receive a signal
// during VDSO code we can find the g.
// If we don't have a signal stack, we won't receive signal,
// so don't bother saving g.
// When using cgo, we already saved g on TLS, also don't save
// g here.
// Also don't save g if we are already on the signal stack.
// We won't get a nested signal.
MOVBZ runtime·iscgo(SB), R22
CMP R22, $0
BNE nosaveg
MOVD m_gsignal(R21), R22 // g.m.gsignal
CMP R22, $0
BEQ nosaveg
CMP g, R22
BEQ nosaveg
MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo
MOVD g, (R22)
BL (CTR) // Call from VDSO
MOVD $0, (R22) // clear g slot, R22 is unchanged by C code
JMP finish
nosaveg:
BL (CTR) // Call from VDSO
finish:
MOVD $0, R0 // Restore R0
MOVD 0(R1), R3 // sec
MOVD 8(R1), R5 // nsec
MOVD R15, R1 // Restore SP
// Restore vdsoPC, vdsoSP
// We don't worry about being signaled between the two stores.
// If we are not in a signal handler, we'll restore vdsoSP to 0,
// and no one will care about vdsoPC. If we are in a signal handler,
// we cannot receive another signal.
MOVD 40(R1), R6
MOVD R6, m_vdsoSP(R21)
MOVD 32(R1), R6
MOVD R6, m_vdsoPC(R21)
return:
MOVD R3, sec+0(FP)
MOVW R5, nsec+8(FP)
RET
// Syscall fallback
fallback:
ADD $32, R1, R4
SYSCALL $SYS_clock_gettime
MOVD 32(R1), R3
MOVD 40(R1), R5
JMP return
TEXT runtime·nanotime1(SB),NOSPLIT,$16-8
MOVD $1, R3 // CLOCK_MONOTONIC
MOVD R1, R15 // R15 is unchanged by C code
MOVD g_m(g), R21 // R21 = m
MOVD runtime·vdsoClockgettimeSym(SB), R12 // Check for VDSO availability
CMP R12, R0
BEQ fallback
// Set vdsoPC and vdsoSP for SIGPROF traceback.
// Save the old values on stack and restore them on exit,
// so this function is reentrant.
MOVD m_vdsoPC(R21), R4
MOVD m_vdsoSP(R21), R5
MOVD R4, 32(R1)
MOVD R5, 40(R1)
MOVD LR, R14 // R14 is unchanged by C code
MOVD $ret-FIXED_FRAME(FP), R5 // caller's SP
MOVD R14, m_vdsoPC(R21)
MOVD R5, m_vdsoSP(R21)
MOVD m_curg(R21), R6
CMP g, R6
BNE noswitch
MOVD m_g0(R21), R7
MOVD (g_sched+gobuf_sp)(R7), R1 // Set SP to g0 stack
noswitch:
SUB $16, R1 // Space for results
RLDICR $0, R1, $59, R1 // Align for C code
MOVD R12, CTR
MOVD R1, R4
// Store g on gsignal's stack, so if we receive a signal
// during VDSO code we can find the g.
// If we don't have a signal stack, we won't receive signal,
// so don't bother saving g.
// When using cgo, we already saved g on TLS, also don't save
// g here.
// Also don't save g if we are already on the signal stack.
// We won't get a nested signal.
MOVBZ runtime·iscgo(SB), R22
CMP R22, $0
BNE nosaveg
MOVD m_gsignal(R21), R22 // g.m.gsignal
CMP R22, $0
BEQ nosaveg
CMP g, R22
BEQ nosaveg
MOVD (g_stack+stack_lo)(R22), R22 // g.m.gsignal.stack.lo
MOVD g, (R22)
BL (CTR) // Call from VDSO
MOVD $0, (R22) // clear g slot, R22 is unchanged by C code
JMP finish
nosaveg:
BL (CTR) // Call from VDSO
finish:
MOVD $0, R0 // Restore R0
MOVD 0(R1), R3 // sec
MOVD 8(R1), R5 // nsec
MOVD R15, R1 // Restore SP
// Restore vdsoPC, vdsoSP
// We don't worry about being signaled between the two stores.
// If we are not in a signal handler, we'll restore vdsoSP to 0,
// and no one will care about vdsoPC. If we are in a signal handler,
// we cannot receive another signal.
MOVD 40(R1), R6
MOVD R6, m_vdsoSP(R21)
MOVD 32(R1), R6
MOVD R6, m_vdsoPC(R21)
return:
// sec is in R3, nsec in R5
// return nsec in R3
MOVD $1000000000, R4
MULLD R4, R3
ADD R5, R3
MOVD R3, ret+0(FP)
RET
// Syscall fallback
fallback:
ADD $32, R1, R4
SYSCALL $SYS_clock_gettime
MOVD 32(R1), R3
MOVD 40(R1), R5
JMP return
TEXT runtime·rtsigprocmask(SB),NOSPLIT|NOFRAME,$0-28
MOVW how+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
MOVW size+24(FP), R6
SYSCALL $SYS_rt_sigprocmask
BVC 2(PC)
MOVD R0, 0xf0(R0) // crash
RET
TEXT runtime·rt_sigaction(SB),NOSPLIT|NOFRAME,$0-36
MOVD sig+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
MOVD size+24(FP), R6
SYSCALL $SYS_rt_sigaction
BVC 2(PC)
NEG R3 // caller expects negative errno
MOVW R3, ret+32(FP)
RET
#ifdef GOARCH_ppc64le
// Call the function stored in _cgo_sigaction using the GCC calling convention.
TEXT runtime·callCgoSigaction(SB),NOSPLIT,$0
MOVD sig+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
MOVD _cgo_sigaction(SB), R12
MOVD R12, CTR // R12 should contain the function address
MOVD R1, R15 // Save R1
MOVD R2, 24(R1) // Save R2
SUB $48, R1 // reserve 32 (frame) + 16 bytes for sp-8 where fp may be saved.
RLDICR $0, R1, $59, R1 // Align to 16 bytes for C code
BL (CTR)
XOR R0, R0, R0 // Clear R0 as Go expects
MOVD R15, R1 // Restore R1
MOVD 24(R1), R2 // Restore R2
MOVW R3, ret+24(FP) // Return result
RET
#endif
TEXT runtime·sigfwd(SB),NOSPLIT,$0-32
MOVW sig+8(FP), R3
MOVD info+16(FP), R4
MOVD ctx+24(FP), R5
MOVD fn+0(FP), R12
MOVD R12, CTR
BL (CTR)
MOVD 24(R1), R2
RET
TEXT runtime·sigreturn(SB),NOSPLIT,$0-0
RET
#ifdef GOARCH_ppc64le
// ppc64le doesn't need function descriptors
// Save callee-save registers in the case of signal forwarding.
// Same as on ARM64 https://golang.org/issue/31827 .
TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
#else
// function descriptor for the real sigtramp
TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
DWORD $sigtramp<>(SB)
DWORD $0
DWORD $0
TEXT sigtramp<>(SB),NOSPLIT|NOFRAME|TOPFRAME,$0
#endif
// Start with standard C stack frame layout and linkage.
MOVD LR, R0
MOVD R0, 16(R1) // Save LR in caller's frame.
MOVW CR, R0 // Save CR in caller's frame
MOVD R0, 8(R1)
// The stack must be acquired here and not
// in the automatic way based on stack size
// since that sequence clobbers R31 before it
// gets saved.
// We are being ultra safe here in saving the
// Vregs. The case where they might need to
// be saved is very unlikely.
MOVDU R1, -544(R1)
MOVD R14, 64(R1)
MOVD R15, 72(R1)
MOVD R16, 80(R1)
MOVD R17, 88(R1)
MOVD R18, 96(R1)
MOVD R19, 104(R1)
MOVD R20, 112(R1)
MOVD R21, 120(R1)
MOVD R22, 128(R1)
MOVD R23, 136(R1)
MOVD R24, 144(R1)
MOVD R25, 152(R1)
MOVD R26, 160(R1)
MOVD R27, 168(R1)
MOVD R28, 176(R1)
MOVD R29, 184(R1)
MOVD g, 192(R1) // R30
MOVD R31, 200(R1)
FMOVD F14, 208(R1)
FMOVD F15, 216(R1)
FMOVD F16, 224(R1)
FMOVD F17, 232(R1)
FMOVD F18, 240(R1)
FMOVD F19, 248(R1)
FMOVD F20, 256(R1)
FMOVD F21, 264(R1)
FMOVD F22, 272(R1)
FMOVD F23, 280(R1)
FMOVD F24, 288(R1)
FMOVD F25, 296(R1)
FMOVD F26, 304(R1)
FMOVD F27, 312(R1)
FMOVD F28, 320(R1)
FMOVD F29, 328(R1)
FMOVD F30, 336(R1)
FMOVD F31, 344(R1)
// Save V regs
// STXVD2X and LXVD2X used since
// we aren't sure of alignment.
// Endianness doesn't matter
// if we are just loading and
// storing values.
MOVD $352, R7 // V20
STXVD2X VS52, (R7)(R1)
ADD $16, R7 // V21 368
STXVD2X VS53, (R7)(R1)
ADD $16, R7 // V22 384
STXVD2X VS54, (R7)(R1)
ADD $16, R7 // V23 400
STXVD2X VS55, (R7)(R1)
ADD $16, R7 // V24 416
STXVD2X VS56, (R7)(R1)
ADD $16, R7 // V25 432
STXVD2X VS57, (R7)(R1)
ADD $16, R7 // V26 448
STXVD2X VS58, (R7)(R1)
ADD $16, R7 // V27 464
STXVD2X VS59, (R7)(R1)
ADD $16, R7 // V28 480
STXVD2X VS60, (R7)(R1)
ADD $16, R7 // V29 496
STXVD2X VS61, (R7)(R1)
ADD $16, R7 // V30 512
STXVD2X VS62, (R7)(R1)
ADD $16, R7 // V31 528
STXVD2X VS63, (R7)(R1)
// initialize essential registers (just in case)
BL runtime·reginit(SB)
// this might be called in external code context,
// where g is not set.
MOVBZ runtime·iscgo(SB), R6
CMP R6, $0
BEQ 2(PC)
BL runtime·load_g(SB)
MOVW R3, FIXED_FRAME+0(R1)
MOVD R4, FIXED_FRAME+8(R1)
MOVD R5, FIXED_FRAME+16(R1)
MOVD $runtime·sigtrampgo(SB), R12
MOVD R12, CTR
BL (CTR)
MOVD 24(R1), R2 // Should this be here? Where is it saved?
// Starts at 64; FIXED_FRAME is 32
MOVD 64(R1), R14
MOVD 72(R1), R15
MOVD 80(R1), R16
MOVD 88(R1), R17
MOVD 96(R1), R18
MOVD 104(R1), R19
MOVD 112(R1), R20
MOVD 120(R1), R21
MOVD 128(R1), R22
MOVD 136(R1), R23
MOVD 144(R1), R24
MOVD 152(R1), R25
MOVD 160(R1), R26
MOVD 168(R1), R27
MOVD 176(R1), R28
MOVD 184(R1), R29
MOVD 192(R1), g // R30
MOVD 200(R1), R31
FMOVD 208(R1), F14
FMOVD 216(R1), F15
FMOVD 224(R1), F16
FMOVD 232(R1), F17
FMOVD 240(R1), F18
FMOVD 248(R1), F19
FMOVD 256(R1), F20
FMOVD 264(R1), F21
FMOVD 272(R1), F22
FMOVD 280(R1), F23
FMOVD 288(R1), F24
FMOVD 292(R1), F25
FMOVD 300(R1), F26
FMOVD 308(R1), F27
FMOVD 316(R1), F28
FMOVD 328(R1), F29
FMOVD 336(R1), F30
FMOVD 344(R1), F31
MOVD $352, R7
LXVD2X (R7)(R1), VS52
ADD $16, R7 // 368 V21
LXVD2X (R7)(R1), VS53
ADD $16, R7 // 384 V22
LXVD2X (R7)(R1), VS54
ADD $16, R7 // 400 V23
LXVD2X (R7)(R1), VS55
ADD $16, R7 // 416 V24
LXVD2X (R7)(R1), VS56
ADD $16, R7 // 432 V25
LXVD2X (R7)(R1), VS57
ADD $16, R7 // 448 V26
LXVD2X (R7)(R1), VS58
ADD $16, R8 // 464 V27
LXVD2X (R7)(R1), VS59
ADD $16, R7 // 480 V28
LXVD2X (R7)(R1), VS60
ADD $16, R7 // 496 V29
LXVD2X (R7)(R1), VS61
ADD $16, R7 // 512 V30
LXVD2X (R7)(R1), VS62
ADD $16, R7 // 528 V31
LXVD2X (R7)(R1), VS63
ADD $544, R1
MOVD 8(R1), R0
MOVFL R0, $0xff
MOVD 16(R1), R0
MOVD R0, LR
RET
#ifdef GOARCH_ppc64le
// ppc64le doesn't need function descriptors
TEXT runtime·cgoSigtramp(SB),NOSPLIT|NOFRAME,$0
// The stack unwinder, presumably written in C, may not be able to
// handle Go frame correctly. So, this function is NOFRAME, and we
// save/restore LR manually.
MOVD LR, R10
// We're coming from C code, initialize essential registers.
CALL runtime·reginit(SB)
// If no traceback function, do usual sigtramp.
MOVD runtime·cgoTraceback(SB), R6
CMP $0, R6
BEQ sigtramp
// If no traceback support function, which means that
// runtime/cgo was not linked in, do usual sigtramp.
MOVD _cgo_callers(SB), R6
CMP $0, R6
BEQ sigtramp
// Set up g register.
CALL runtime·load_g(SB)
// Figure out if we are currently in a cgo call.
// If not, just do usual sigtramp.
// compared to ARM64 and others.
CMP $0, g
BEQ sigtrampnog // g == nil
MOVD g_m(g), R6
CMP $0, R6
BEQ sigtramp // g.m == nil
MOVW m_ncgo(R6), R7
CMPW $0, R7
BEQ sigtramp // g.m.ncgo = 0
MOVD m_curg(R6), R7
CMP $0, R7
BEQ sigtramp // g.m.curg == nil
MOVD g_syscallsp(R7), R7
CMP $0, R7
BEQ sigtramp // g.m.curg.syscallsp == 0
MOVD m_cgoCallers(R6), R7 // R7 is the fifth arg in C calling convention.
CMP $0, R7
BEQ sigtramp // g.m.cgoCallers == nil
MOVW m_cgoCallersUse(R6), R8
CMPW $0, R8
BNE sigtramp // g.m.cgoCallersUse != 0
// Jump to a function in runtime/cgo.
// That function, written in C, will call the user's traceback
// function with proper unwind info, and will then call back here.
// The first three arguments, and the fifth, are already in registers.
// Set the two remaining arguments now.
MOVD runtime·cgoTraceback(SB), R6
MOVD $runtime·sigtramp(SB), R8
MOVD _cgo_callers(SB), R12
MOVD R12, CTR
MOVD R10, LR // restore LR
JMP (CTR)
sigtramp:
MOVD R10, LR // restore LR
JMP runtime·sigtramp(SB)
sigtrampnog:
// Signal arrived on a non-Go thread. If this is SIGPROF, get a
// stack trace.
CMPW R3, $27 // 27 == SIGPROF
BNE sigtramp
// Lock sigprofCallersUse (cas from 0 to 1).
MOVW $1, R7
MOVD $runtime·sigprofCallersUse(SB), R8
SYNC
LWAR (R8), R6
CMPW $0, R6
BNE sigtramp
STWCCC R7, (R8)
BNE -4(PC)
ISYNC
// Jump to the traceback function in runtime/cgo.
// It will call back to sigprofNonGo, which will ignore the
// arguments passed in registers.
// First three arguments to traceback function are in registers already.
MOVD runtime·cgoTraceback(SB), R6
MOVD $runtime·sigprofCallers(SB), R7
MOVD $runtime·sigprofNonGoWrapper<>(SB), R8
MOVD _cgo_callers(SB), R12
MOVD R12, CTR
MOVD R10, LR // restore LR
JMP (CTR)
#else
// function descriptor for the real sigtramp
TEXT runtime·cgoSigtramp(SB),NOSPLIT|NOFRAME,$0
DWORD $cgoSigtramp<>(SB)
DWORD $0
DWORD $0
TEXT cgoSigtramp<>(SB),NOSPLIT,$0
JMP sigtramp<>(SB)
#endif
TEXT runtime·sigprofNonGoWrapper<>(SB),NOSPLIT,$0
// We're coming from C code, set up essential register, then call sigprofNonGo.
CALL runtime·reginit(SB)
MOVW R3, FIXED_FRAME+0(R1) // sig
MOVD R4, FIXED_FRAME+8(R1) // info
MOVD R5, FIXED_FRAME+16(R1) // ctx
CALL runtime·sigprofNonGo(SB)
RET
TEXT runtime·mmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVW prot+16(FP), R5
MOVW flags+20(FP), R6
MOVW fd+24(FP), R7
MOVW off+28(FP), R8
SYSCALL $SYS_mmap
BVC ok
MOVD $0, p+32(FP)
MOVD R3, err+40(FP)
RET
ok:
MOVD R3, p+32(FP)
MOVD $0, err+40(FP)
RET
TEXT runtime·munmap(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
SYSCALL $SYS_munmap
BVC 2(PC)
MOVD R0, 0xf0(R0)
RET
TEXT runtime·madvise(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVD n+8(FP), R4
MOVW flags+16(FP), R5
SYSCALL $SYS_madvise
MOVW R3, ret+24(FP)
RET
// int64 futex(int32 *uaddr, int32 op, int32 val,
// struct timespec *timeout, int32 *uaddr2, int32 val2);
TEXT runtime·futex(SB),NOSPLIT|NOFRAME,$0
MOVD addr+0(FP), R3
MOVW op+8(FP), R4
MOVW val+12(FP), R5
MOVD ts+16(FP), R6
MOVD addr2+24(FP), R7
MOVW val3+32(FP), R8
SYSCALL $SYS_futex
BVC 2(PC)
NEG R3 // caller expects negative errno
MOVW R3, ret+40(FP)
RET
// int64 clone(int32 flags, void *stk, M *mp, G *gp, void (*fn)(void));
TEXT runtime·clone(SB),NOSPLIT|NOFRAME,$0
MOVW flags+0(FP), R3
MOVD stk+8(FP), R4
// Copy mp, gp, fn off parent stack for use by child.
// Careful: Linux system call clobbers ???.
MOVD mp+16(FP), R7
MOVD gp+24(FP), R8
MOVD fn+32(FP), R12
MOVD R7, -8(R4)
MOVD R8, -16(R4)
MOVD R12, -24(R4)
MOVD $1234, R7
MOVD R7, -32(R4)
SYSCALL $SYS_clone
BVC 2(PC)
NEG R3 // caller expects negative errno
// In parent, return.
CMP R3, $0
BEQ 3(PC)
MOVW R3, ret+40(FP)
RET
// In child, on new stack.
// initialize essential registers
BL runtime·reginit(SB)
MOVD -32(R1), R7
CMP R7, $1234
BEQ 2(PC)
MOVD R0, 0(R0)
// Initialize m->procid to Linux tid
SYSCALL $SYS_gettid
MOVD -24(R1), R12 // fn
MOVD -16(R1), R8 // g
MOVD -8(R1), R7 // m
CMP R7, $0
BEQ nog
CMP R8, $0
BEQ nog
MOVD R3, m_procid(R7)
// TODO: setup TLS.
// In child, set up new stack
MOVD R7, g_m(R8)
MOVD R8, g
//CALL runtime·stackcheck(SB)
nog:
// Call fn
MOVD R12, CTR
BL (CTR)
// It shouldn't return. If it does, exit that thread.
MOVW $111, R3
SYSCALL $SYS_exit
BR -2(PC) // keep exiting
TEXT runtime·sigaltstack(SB),NOSPLIT|NOFRAME,$0
MOVD new+0(FP), R3
MOVD old+8(FP), R4
SYSCALL $SYS_sigaltstack
BVC 2(PC)
MOVD R0, 0xf0(R0) // crash
RET
TEXT runtime·osyield(SB),NOSPLIT|NOFRAME,$0
SYSCALL $SYS_sched_yield
RET
TEXT runtime·sched_getaffinity(SB),NOSPLIT|NOFRAME,$0
MOVD pid+0(FP), R3
MOVD len+8(FP), R4
MOVD buf+16(FP), R5
SYSCALL $SYS_sched_getaffinity
BVC 2(PC)
NEG R3 // caller expects negative errno
MOVW R3, ret+24(FP)
RET
// int32 runtime·epollcreate(int32 size);
TEXT runtime·epollcreate(SB),NOSPLIT|NOFRAME,$0
MOVW size+0(FP), R3
SYSCALL $SYS_epoll_create
BVC 2(PC)
NEG R3 // caller expects negative errno
MOVW R3, ret+8(FP)
RET
// int32 runtime·epollcreate1(int32 flags);
TEXT runtime·epollcreate1(SB),NOSPLIT|NOFRAME,$0
MOVW flags+0(FP), R3
SYSCALL $SYS_epoll_create1
BVC 2(PC)
NEG R3 // caller expects negative errno
MOVW R3, ret+8(FP)
RET
// func epollctl(epfd, op, fd int32, ev *epollEvent) int
TEXT runtime·epollctl(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R3
MOVW op+4(FP), R4
MOVW fd+8(FP), R5
MOVD ev+16(FP), R6
SYSCALL $SYS_epoll_ctl
NEG R3 // caller expects negative errno
MOVW R3, ret+24(FP)
RET
// int32 runtime·epollwait(int32 epfd, EpollEvent *ev, int32 nev, int32 timeout);
TEXT runtime·epollwait(SB),NOSPLIT|NOFRAME,$0
MOVW epfd+0(FP), R3
MOVD ev+8(FP), R4
MOVW nev+16(FP), R5
MOVW timeout+20(FP), R6
SYSCALL $SYS_epoll_wait
BVC 2(PC)
NEG R3 // caller expects negative errno
MOVW R3, ret+24(FP)
RET
// void runtime·closeonexec(int32 fd);
TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
MOVW fd+0(FP), R3 // fd
MOVD $2, R4 // F_SETFD
MOVD $1, R5 // FD_CLOEXEC
SYSCALL $SYS_fcntl
RET
// func sbrk0() uintptr
TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0
// Implemented as brk(NULL).
MOVD $0, R3
SYSCALL $SYS_brk
MOVD R3, ret+0(FP)
RET
TEXT runtime·access(SB),$0-20
MOVD R0, 0(R0) // unimplemented, only needed for android; declared in stubs_linux.go
MOVW R0, ret+16(FP) // for vet
RET
TEXT runtime·connect(SB),$0-28
MOVD R0, 0(R0) // unimplemented, only needed for android; declared in stubs_linux.go
MOVW R0, ret+24(FP) // for vet
RET
TEXT runtime·socket(SB),$0-20
MOVD R0, 0(R0) // unimplemented, only needed for android; declared in stubs_linux.go
MOVW R0, ret+16(FP) // for vet
RET
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