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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.
|
| // +build aix
| // +build ppc64 ppc64le
|
| //
| // 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 runtime·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 struture
| // 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.
| // NOT USING GO CALLING CONVENTION
| TEXT runtime·asmsyscall6(SB),NOSPLIT,$256
| MOVD R3, 48(R1) // Save libcall for later
| 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 runtime·callCfunction(SB)
|
| // Restore R0 and TOC
| XOR R0, R0
| MOVD 40(R1), R2
|
| // Store result in libcall
| MOVD 48(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
| MOVD R12, CTR
| BL (CTR)
| RET
|
|
| // runtime.sigtramp is a function descriptor to the real sigtramp.
| DATA runtime·sigtramp+0(SB)/8, $runtime·_sigtramp(SB)
| DATA runtime·sigtramp+8(SB)/8, $TOC(SB)
| DATA runtime·sigtramp+16(SB)/8, $0
| GLOBL runtime·sigtramp(SB), NOPTR, $24
|
| // This funcion must not have any frame as we want to control how
| // every registers are used.
| TEXT runtime·_sigtramp(SB),NOSPLIT|NOFRAME,$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 $128+FIXED_FRAME, R1
|
| // Save registers
| MOVD R31, 56(R1)
| MOVD g, 64(R1)
| MOVD R29, 72(R1)
|
| BL runtime·load_g(SB)
|
| // Save m->libcall. We need to do this because we
| // might get interrupted by a signal in runtime·asmcgocall.
|
| // save m->libcall
| MOVD g_m(g), R6
| MOVD (m_libcall+libcall_fn)(R6), R7
| MOVD R7, 80(R1)
| MOVD (m_libcall+libcall_args)(R6), R7
| MOVD R7, 88(R1)
| MOVD (m_libcall+libcall_n)(R6), R7
| MOVD R7, 96(R1)
| MOVD (m_libcall+libcall_r1)(R6), R7
| MOVD R7, 104(R1)
| MOVD (m_libcall+libcall_r2)(R6), R7
| MOVD R7, 112(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, 120(R1)
|
| 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 g_m(g), R6
| // restore libcall
| MOVD 80(R1), R7
| MOVD R7, (m_libcall+libcall_fn)(R6)
| MOVD 88(R1), R7
| MOVD R7, (m_libcall+libcall_args)(R6)
| MOVD 96(R1), R7
| MOVD R7, (m_libcall+libcall_n)(R6)
| MOVD 104(R1), R7
| MOVD R7, (m_libcall+libcall_r1)(R6)
| MOVD 112(R1), R7
| MOVD R7, (m_libcall+libcall_r2)(R6)
|
| // restore errno
| MOVD (m_mOS+mOS_perrno)(R6), R7
| MOVD 120(R1), R8
| MOVD R8, 0(R7)
|
| // restore registers
| MOVD 56(R1),R31
| MOVD 64(R1),g
| MOVD 72(R1),R29
|
| // Don't use RET because we need to restore R31 !
| ADD $128+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, $runtime·_tstart(SB)
| DATA runtime·tstart+8(SB)/8, $TOC(SB)
| DATA runtime·tstart+16(SB)/8, $0
| GLOBL runtime·tstart(SB), NOPTR, $24
|
| TEXT runtime·_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
|
| // Runs on OS stack, called from runtime·osyield.
| TEXT runtime·osyield1(SB),NOSPLIT,$0
| MOVD $libc_sched_yield(SB), R12
| 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
| RET
|
|
