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// Copyright 2018 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 ppc64, Aix
//
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
#include "asm_ppc64x.h"
// This function calls a C function with the function descriptor in R12
TEXT callCfunction<>(SB), NOSPLIT|NOFRAME,$0
MOVD 0(R12), R12
MOVD R2, 40(R1)
MOVD 0(R12), R0
MOVD 8(R12), R2
MOVD R0, CTR
BR (CTR)
// asmsyscall6 calls a library function with a function descriptor
// stored in libcall_fn and store the results in libcall structure
// Up to 6 arguments can be passed to this C function
// Called by runtime.asmcgocall
// It reserves a stack of 288 bytes for the C function. It must
// follow AIX convention, thus the first local variable must
// be stored at the offset 112, after the linker area (48 bytes)
// and the argument area (64).
// The AIX convention is described here:
// https://www.ibm.com/docs/en/aix/7.2?topic=overview-runtime-process-stack
// NOT USING GO CALLING CONVENTION
// runtime.asmsyscall6 is a function descriptor to the real asmsyscall6.
DATA runtime·asmsyscall6+0(SB)/8, $asmsyscall6<>(SB)
DATA runtime·asmsyscall6+8(SB)/8, $TOC(SB)
DATA runtime·asmsyscall6+16(SB)/8, $0
GLOBL runtime·asmsyscall6(SB), NOPTR, $24
TEXT asmsyscall6<>(SB),NOSPLIT,$256
// Save libcall for later
MOVD R3, 112(R1)
MOVD libcall_fn(R3), R12
MOVD libcall_args(R3), R9
MOVD 0(R9), R3
MOVD 8(R9), R4
MOVD 16(R9), R5
MOVD 24(R9), R6
MOVD 32(R9), R7
MOVD 40(R9), R8
BL callCfunction<>(SB)
// Restore R0 and TOC
XOR R0, R0
MOVD 40(R1), R2
// Store result in libcall
MOVD 112(R1), R5
MOVD R3, (libcall_r1)(R5)
MOVD $-1, R6
CMP R6, R3
BNE skiperrno
// Save errno in libcall
BL runtime·load_g(SB)
MOVD g_m(g), R4
MOVD (m_mOS + mOS_perrno)(R4), R9
MOVW 0(R9), R9
MOVD R9, (libcall_err)(R5)
RET
skiperrno:
// Reset errno if no error has been returned
MOVD R0, (libcall_err)(R5)
RET
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
// fn is a function descriptor
// R2 must be saved on restore
MOVD 0(R12), R0
MOVD R2, 40(R1)
MOVD 8(R12), R2
MOVD R0, CTR
BL (CTR)
MOVD 40(R1), R2
BL runtime·reginit(SB)
RET
// runtime.sigtramp is a function descriptor to the real sigtramp.
DATA runtime·sigtramp+0(SB)/8, $sigtramp<>(SB)
DATA runtime·sigtramp+8(SB)/8, $TOC(SB)
DATA runtime·sigtramp+16(SB)/8, $0
GLOBL runtime·sigtramp(SB), NOPTR, $24
// This function must not have any frame as we want to control how
// every registers are used.
// TODO(aix): Implement SetCgoTraceback handler.
TEXT sigtramp<>(SB),NOSPLIT|NOFRAME|TOPFRAME,$0
MOVD LR, R0
MOVD R0, 16(R1)
// initialize essential registers (just in case)
BL runtime·reginit(SB)
// Note that we are executing on altsigstack here, so we have
// more stack available than NOSPLIT would have us believe.
// To defeat the linker, we make our own stack frame with
// more space.
SUB $144+FIXED_FRAME, R1
// Save registers
MOVD R31, 56(R1)
MOVD g, 64(R1)
MOVD R29, 72(R1)
MOVD R14, 80(R1)
MOVD R15, 88(R1)
BL runtime·load_g(SB)
CMP $0, g
BEQ sigtramp // g == nil
MOVD g_m(g), R6
CMP $0, R6
BEQ sigtramp // g.m == nil
// Save m->libcall. We need to do this because we
// might get interrupted by a signal in runtime·asmcgocall.
MOVD (m_libcall+libcall_fn)(R6), R7
MOVD R7, 96(R1)
MOVD (m_libcall+libcall_args)(R6), R7
MOVD R7, 104(R1)
MOVD (m_libcall+libcall_n)(R6), R7
MOVD R7, 112(R1)
MOVD (m_libcall+libcall_r1)(R6), R7
MOVD R7, 120(R1)
MOVD (m_libcall+libcall_r2)(R6), R7
MOVD R7, 128(R1)
// save errno, it might be EINTR; stuff we do here might reset it.
MOVD (m_mOS+mOS_perrno)(R6), R8
MOVD 0(R8), R8
MOVD R8, 136(R1)
sigtramp:
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)
CMP $0, g
BEQ exit // g == nil
MOVD g_m(g), R6
CMP $0, R6
BEQ exit // g.m == nil
// restore libcall
MOVD 96(R1), R7
MOVD R7, (m_libcall+libcall_fn)(R6)
MOVD 104(R1), R7
MOVD R7, (m_libcall+libcall_args)(R6)
MOVD 112(R1), R7
MOVD R7, (m_libcall+libcall_n)(R6)
MOVD 120(R1), R7
MOVD R7, (m_libcall+libcall_r1)(R6)
MOVD 128(R1), R7
MOVD R7, (m_libcall+libcall_r2)(R6)
// restore errno
MOVD (m_mOS+mOS_perrno)(R6), R7
MOVD 136(R1), R8
MOVD R8, 0(R7)
exit:
// restore registers
MOVD 56(R1),R31
MOVD 64(R1),g
MOVD 72(R1),R29
MOVD 80(R1), R14
MOVD 88(R1), R15
// Don't use RET because we need to restore R31 !
ADD $144+FIXED_FRAME, R1
MOVD 16(R1), R0
MOVD R0, LR
BR (LR)
// runtime.tstart is a function descriptor to the real tstart.
DATA runtime·tstart+0(SB)/8, $tstart<>(SB)
DATA runtime·tstart+8(SB)/8, $TOC(SB)
DATA runtime·tstart+16(SB)/8, $0
GLOBL runtime·tstart(SB), NOPTR, $24
TEXT tstart<>(SB),NOSPLIT,$0
XOR R0, R0 // reset R0
// set g
MOVD m_g0(R3), g
BL runtime·save_g(SB)
MOVD R3, g_m(g)
// Layout new m scheduler stack on os stack.
MOVD R1, R3
MOVD R3, (g_stack+stack_hi)(g)
SUB $(const_threadStackSize), R3 // stack size
MOVD R3, (g_stack+stack_lo)(g)
ADD $const__StackGuard, R3
MOVD R3, g_stackguard0(g)
MOVD R3, g_stackguard1(g)
BL runtime·mstart(SB)
MOVD R0, R3
RET
#define CSYSCALL() \
MOVD 0(R12), R12 \
MOVD R2, 40(R1) \
MOVD 0(R12), R0 \
MOVD 8(R12), R2 \
MOVD R0, CTR \
BL (CTR) \
MOVD 40(R1), R2 \
BL runtime·reginit(SB)
// Runs on OS stack, called from runtime·osyield.
TEXT runtime·osyield1(SB),NOSPLIT,$0
MOVD $libc_sched_yield(SB), R12
CSYSCALL()
RET
// Runs on OS stack, called from runtime·sigprocmask.
TEXT runtime·sigprocmask1(SB),NOSPLIT,$0-24
MOVD how+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
MOVD $libpthread_sigthreadmask(SB), R12
CSYSCALL()
RET
// Runs on OS stack, called from runtime·usleep.
TEXT runtime·usleep1(SB),NOSPLIT,$0-4
MOVW us+0(FP), R3
MOVD $libc_usleep(SB), R12
CSYSCALL()
RET
// Runs on OS stack, called from runtime·exit.
TEXT runtime·exit1(SB),NOSPLIT,$0-4
MOVW code+0(FP), R3
MOVD $libc_exit(SB), R12
CSYSCALL()
RET
// Runs on OS stack, called from runtime·write1.
TEXT runtime·write2(SB),NOSPLIT,$0-28
MOVD fd+0(FP), R3
MOVD p+8(FP), R4
MOVW n+16(FP), R5
MOVD $libc_write(SB), R12
CSYSCALL()
MOVW R3, ret+24(FP)
RET
// Runs on OS stack, called from runtime·pthread_attr_init.
TEXT runtime·pthread_attr_init1(SB),NOSPLIT,$0-12
MOVD attr+0(FP), R3
MOVD $libpthread_attr_init(SB), R12
CSYSCALL()
MOVW R3, ret+8(FP)
RET
// Runs on OS stack, called from runtime·pthread_attr_setstacksize.
TEXT runtime·pthread_attr_setstacksize1(SB),NOSPLIT,$0-20
MOVD attr+0(FP), R3
MOVD size+8(FP), R4
MOVD $libpthread_attr_setstacksize(SB), R12
CSYSCALL()
MOVW R3, ret+16(FP)
RET
// Runs on OS stack, called from runtime·pthread_setdetachstate.
TEXT runtime·pthread_attr_setdetachstate1(SB),NOSPLIT,$0-20
MOVD attr+0(FP), R3
MOVW state+8(FP), R4
MOVD $libpthread_attr_setdetachstate(SB), R12
CSYSCALL()
MOVW R3, ret+16(FP)
RET
// Runs on OS stack, called from runtime·pthread_create.
TEXT runtime·pthread_create1(SB),NOSPLIT,$0-36
MOVD tid+0(FP), R3
MOVD attr+8(FP), R4
MOVD fn+16(FP), R5
MOVD arg+24(FP), R6
MOVD $libpthread_create(SB), R12
CSYSCALL()
MOVW R3, ret+32(FP)
RET
// Runs on OS stack, called from runtime·sigaction.
TEXT runtime·sigaction1(SB),NOSPLIT,$0-24
MOVD sig+0(FP), R3
MOVD new+8(FP), R4
MOVD old+16(FP), R5
MOVD $libc_sigaction(SB), R12
CSYSCALL()
RET
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