diff options
Diffstat (limited to 'vendor/golang.org/x/sys/unix/asm_zos_s390x.s')
| -rw-r--r-- | vendor/golang.org/x/sys/unix/asm_zos_s390x.s | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/vendor/golang.org/x/sys/unix/asm_zos_s390x.s b/vendor/golang.org/x/sys/unix/asm_zos_s390x.s new file mode 100644 index 0000000..813dfad --- /dev/null +++ b/vendor/golang.org/x/sys/unix/asm_zos_s390x.s @@ -0,0 +1,382 @@ +// Copyright 2020 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 zos && s390x && gc + +#include "textflag.h" + +#define PSALAA 1208(R0) +#define GTAB64(x) 80(x) +#define LCA64(x) 88(x) +#define SAVSTACK_ASYNC(x) 336(x) // in the LCA +#define CAA(x) 8(x) +#define CEECAATHDID(x) 976(x) // in the CAA +#define EDCHPXV(x) 1016(x) // in the CAA +#define GOCB(x) 1104(x) // in the CAA + +// SS_*, where x=SAVSTACK_ASYNC +#define SS_LE(x) 0(x) +#define SS_GO(x) 8(x) +#define SS_ERRNO(x) 16(x) +#define SS_ERRNOJR(x) 20(x) + +// Function Descriptor Offsets +#define __errno 0x156*16 +#define __err2ad 0x16C*16 + +// Call Instructions +#define LE_CALL BYTE $0x0D; BYTE $0x76 // BL R7, R6 +#define SVC_LOAD BYTE $0x0A; BYTE $0x08 // SVC 08 LOAD +#define SVC_DELETE BYTE $0x0A; BYTE $0x09 // SVC 09 DELETE + +DATA zosLibVec<>(SB)/8, $0 +GLOBL zosLibVec<>(SB), NOPTR, $8 + +TEXT ·initZosLibVec(SB), NOSPLIT|NOFRAME, $0-0 + MOVW PSALAA, R8 + MOVD LCA64(R8), R8 + MOVD CAA(R8), R8 + MOVD EDCHPXV(R8), R8 + MOVD R8, zosLibVec<>(SB) + RET + +TEXT ·GetZosLibVec(SB), NOSPLIT|NOFRAME, $0-0 + MOVD zosLibVec<>(SB), R8 + MOVD R8, ret+0(FP) + RET + +TEXT ·clearErrno(SB), NOSPLIT, $0-0 + BL addrerrno<>(SB) + MOVD $0, 0(R3) + RET + +// Returns the address of errno in R3. +TEXT addrerrno<>(SB), NOSPLIT|NOFRAME, $0-0 + // Get library control area (LCA). + MOVW PSALAA, R8 + MOVD LCA64(R8), R8 + + // Get __errno FuncDesc. + MOVD CAA(R8), R9 + MOVD EDCHPXV(R9), R9 + ADD $(__errno), R9 + LMG 0(R9), R5, R6 + + // Switch to saved LE stack. + MOVD SAVSTACK_ASYNC(R8), R9 + MOVD 0(R9), R4 + MOVD $0, 0(R9) + + // Call __errno function. + LE_CALL + NOPH + + // Switch back to Go stack. + XOR R0, R0 // Restore R0 to $0. + MOVD R4, 0(R9) // Save stack pointer. + RET + +// func svcCall(fnptr unsafe.Pointer, argv *unsafe.Pointer, dsa *uint64) +TEXT ·svcCall(SB), NOSPLIT, $0 + BL runtime·save_g(SB) // Save g and stack pointer + MOVW PSALAA, R8 + MOVD LCA64(R8), R8 + MOVD SAVSTACK_ASYNC(R8), R9 + MOVD R15, 0(R9) + + MOVD argv+8(FP), R1 // Move function arguments into registers + MOVD dsa+16(FP), g + MOVD fnptr+0(FP), R15 + + BYTE $0x0D // Branch to function + BYTE $0xEF + + BL runtime·load_g(SB) // Restore g and stack pointer + MOVW PSALAA, R8 + MOVD LCA64(R8), R8 + MOVD SAVSTACK_ASYNC(R8), R9 + MOVD 0(R9), R15 + + RET + +// func svcLoad(name *byte) unsafe.Pointer +TEXT ·svcLoad(SB), NOSPLIT, $0 + MOVD R15, R2 // Save go stack pointer + MOVD name+0(FP), R0 // Move SVC args into registers + MOVD $0x80000000, R1 + MOVD $0, R15 + SVC_LOAD + MOVW R15, R3 // Save return code from SVC + MOVD R2, R15 // Restore go stack pointer + CMP R3, $0 // Check SVC return code + BNE error + + MOVD $-2, R3 // Reset last bit of entry point to zero + AND R0, R3 + MOVD R3, ret+8(FP) // Return entry point returned by SVC + CMP R0, R3 // Check if last bit of entry point was set + BNE done + + MOVD R15, R2 // Save go stack pointer + MOVD $0, R15 // Move SVC args into registers (entry point still in r0 from SVC 08) + SVC_DELETE + MOVD R2, R15 // Restore go stack pointer + +error: + MOVD $0, ret+8(FP) // Return 0 on failure + +done: + XOR R0, R0 // Reset r0 to 0 + RET + +// func svcUnload(name *byte, fnptr unsafe.Pointer) int64 +TEXT ·svcUnload(SB), NOSPLIT, $0 + MOVD R15, R2 // Save go stack pointer + MOVD name+0(FP), R0 // Move SVC args into registers + MOVD fnptr+8(FP), R15 + SVC_DELETE + XOR R0, R0 // Reset r0 to 0 + MOVD R15, R1 // Save SVC return code + MOVD R2, R15 // Restore go stack pointer + MOVD R1, ret+16(FP) // Return SVC return code + RET + +// func gettid() uint64 +TEXT ·gettid(SB), NOSPLIT, $0 + // Get library control area (LCA). + MOVW PSALAA, R8 + MOVD LCA64(R8), R8 + + // Get CEECAATHDID + MOVD CAA(R8), R9 + MOVD CEECAATHDID(R9), R9 + MOVD R9, ret+0(FP) + + RET + +// +// Call LE function, if the return is -1 +// errno and errno2 is retrieved +// +TEXT ·CallLeFuncWithErr(SB), NOSPLIT, $0 + MOVW PSALAA, R8 + MOVD LCA64(R8), R8 + MOVD CAA(R8), R9 + MOVD g, GOCB(R9) + + // Restore LE stack. + MOVD SAVSTACK_ASYNC(R8), R9 // R9-> LE stack frame saving address + MOVD 0(R9), R4 // R4-> restore previously saved stack frame pointer + + MOVD parms_base+8(FP), R7 // R7 -> argument array + MOVD parms_len+16(FP), R8 // R8 number of arguments + + // arg 1 ---> R1 + CMP R8, $0 + BEQ docall + SUB $1, R8 + MOVD 0(R7), R1 + + // arg 2 ---> R2 + CMP R8, $0 + BEQ docall + SUB $1, R8 + ADD $8, R7 + MOVD 0(R7), R2 + + // arg 3 --> R3 + CMP R8, $0 + BEQ docall + SUB $1, R8 + ADD $8, R7 + MOVD 0(R7), R3 + + CMP R8, $0 + BEQ docall + MOVD $2176+16, R6 // starting LE stack address-8 to store 4th argument + +repeat: + ADD $8, R7 + MOVD 0(R7), R0 // advance arg pointer by 8 byte + ADD $8, R6 // advance LE argument address by 8 byte + MOVD R0, (R4)(R6*1) // copy argument from go-slice to le-frame + SUB $1, R8 + CMP R8, $0 + BNE repeat + +docall: + MOVD funcdesc+0(FP), R8 // R8-> function descriptor + LMG 0(R8), R5, R6 + MOVD $0, 0(R9) // R9 address of SAVSTACK_ASYNC + LE_CALL // balr R7, R6 (return #1) + NOPH + MOVD R3, ret+32(FP) + CMP R3, $-1 // compare result to -1 + BNE done + + // retrieve errno and errno2 + MOVD zosLibVec<>(SB), R8 + ADD $(__errno), R8 + LMG 0(R8), R5, R6 + LE_CALL // balr R7, R6 __errno (return #3) + NOPH + MOVWZ 0(R3), R3 + MOVD R3, err+48(FP) + MOVD zosLibVec<>(SB), R8 + ADD $(__err2ad), R8 + LMG 0(R8), R5, R6 + LE_CALL // balr R7, R6 __err2ad (return #2) + NOPH + MOVW (R3), R2 // retrieve errno2 + MOVD R2, errno2+40(FP) // store in return area + +done: + MOVD R4, 0(R9) // Save stack pointer. + RET + +// +// Call LE function, if the return is 0 +// errno and errno2 is retrieved +// +TEXT ·CallLeFuncWithPtrReturn(SB), NOSPLIT, $0 + MOVW PSALAA, R8 + MOVD LCA64(R8), R8 + MOVD CAA(R8), R9 + MOVD g, GOCB(R9) + + // Restore LE stack. + MOVD SAVSTACK_ASYNC(R8), R9 // R9-> LE stack frame saving address + MOVD 0(R9), R4 // R4-> restore previously saved stack frame pointer + + MOVD parms_base+8(FP), R7 // R7 -> argument array + MOVD parms_len+16(FP), R8 // R8 number of arguments + + // arg 1 ---> R1 + CMP R8, $0 + BEQ docall + SUB $1, R8 + MOVD 0(R7), R1 + + // arg 2 ---> R2 + CMP R8, $0 + BEQ docall + SUB $1, R8 + ADD $8, R7 + MOVD 0(R7), R2 + + // arg 3 --> R3 + CMP R8, $0 + BEQ docall + SUB $1, R8 + ADD $8, R7 + MOVD 0(R7), R3 + + CMP R8, $0 + BEQ docall + MOVD $2176+16, R6 // starting LE stack address-8 to store 4th argument + +repeat: + ADD $8, R7 + MOVD 0(R7), R0 // advance arg pointer by 8 byte + ADD $8, R6 // advance LE argument address by 8 byte + MOVD R0, (R4)(R6*1) // copy argument from go-slice to le-frame + SUB $1, R8 + CMP R8, $0 + BNE repeat + +docall: + MOVD funcdesc+0(FP), R8 // R8-> function descriptor + LMG 0(R8), R5, R6 + MOVD $0, 0(R9) // R9 address of SAVSTACK_ASYNC + LE_CALL // balr R7, R6 (return #1) + NOPH + MOVD R3, ret+32(FP) + CMP R3, $0 // compare result to 0 + BNE done + + // retrieve errno and errno2 + MOVD zosLibVec<>(SB), R8 + ADD $(__errno), R8 + LMG 0(R8), R5, R6 + LE_CALL // balr R7, R6 __errno (return #3) + NOPH + MOVWZ 0(R3), R3 + MOVD R3, err+48(FP) + MOVD zosLibVec<>(SB), R8 + ADD $(__err2ad), R8 + LMG 0(R8), R5, R6 + LE_CALL // balr R7, R6 __err2ad (return #2) + NOPH + MOVW (R3), R2 // retrieve errno2 + MOVD R2, errno2+40(FP) // store in return area + XOR R2, R2 + MOVWZ R2, (R3) // clear errno2 + +done: + MOVD R4, 0(R9) // Save stack pointer. + RET + +// +// function to test if a pointer can be safely dereferenced (content read) +// return 0 for succces +// +TEXT ·ptrtest(SB), NOSPLIT, $0-16 + MOVD arg+0(FP), R10 // test pointer in R10 + + // set up R2 to point to CEECAADMC + BYTE $0xE3; BYTE $0x20; BYTE $0x04; BYTE $0xB8; BYTE $0x00; BYTE $0x17 // llgt 2,1208 + BYTE $0xB9; BYTE $0x17; BYTE $0x00; BYTE $0x22 // llgtr 2,2 + BYTE $0xA5; BYTE $0x26; BYTE $0x7F; BYTE $0xFF // nilh 2,32767 + BYTE $0xE3; BYTE $0x22; BYTE $0x00; BYTE $0x58; BYTE $0x00; BYTE $0x04 // lg 2,88(2) + BYTE $0xE3; BYTE $0x22; BYTE $0x00; BYTE $0x08; BYTE $0x00; BYTE $0x04 // lg 2,8(2) + BYTE $0x41; BYTE $0x22; BYTE $0x03; BYTE $0x68 // la 2,872(2) + + // set up R5 to point to the "shunt" path which set 1 to R3 (failure) + BYTE $0xB9; BYTE $0x82; BYTE $0x00; BYTE $0x33 // xgr 3,3 + BYTE $0xA7; BYTE $0x55; BYTE $0x00; BYTE $0x04 // bras 5,lbl1 + BYTE $0xA7; BYTE $0x39; BYTE $0x00; BYTE $0x01 // lghi 3,1 + + // if r3 is not zero (failed) then branch to finish + BYTE $0xB9; BYTE $0x02; BYTE $0x00; BYTE $0x33 // lbl1 ltgr 3,3 + BYTE $0xA7; BYTE $0x74; BYTE $0x00; BYTE $0x08 // brc b'0111',lbl2 + + // stomic store shunt address in R5 into CEECAADMC + BYTE $0xE3; BYTE $0x52; BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x24 // stg 5,0(2) + + // now try reading from the test pointer in R10, if it fails it branches to the "lghi" instruction above + BYTE $0xE3; BYTE $0x9A; BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x04 // lg 9,0(10) + + // finish here, restore 0 into CEECAADMC + BYTE $0xB9; BYTE $0x82; BYTE $0x00; BYTE $0x99 // lbl2 xgr 9,9 + BYTE $0xE3; BYTE $0x92; BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x24 // stg 9,0(2) + MOVD R3, ret+8(FP) // result in R3 + RET + +// +// function to test if a untptr can be loaded from a pointer +// return 1: the 8-byte content +// 2: 0 for success, 1 for failure +// +// func safeload(ptr uintptr) ( value uintptr, error uintptr) +TEXT ·safeload(SB), NOSPLIT, $0-24 + MOVD ptr+0(FP), R10 // test pointer in R10 + MOVD $0x0, R6 + BYTE $0xE3; BYTE $0x20; BYTE $0x04; BYTE $0xB8; BYTE $0x00; BYTE $0x17 // llgt 2,1208 + BYTE $0xB9; BYTE $0x17; BYTE $0x00; BYTE $0x22 // llgtr 2,2 + BYTE $0xA5; BYTE $0x26; BYTE $0x7F; BYTE $0xFF // nilh 2,32767 + BYTE $0xE3; BYTE $0x22; BYTE $0x00; BYTE $0x58; BYTE $0x00; BYTE $0x04 // lg 2,88(2) + BYTE $0xE3; BYTE $0x22; BYTE $0x00; BYTE $0x08; BYTE $0x00; BYTE $0x04 // lg 2,8(2) + BYTE $0x41; BYTE $0x22; BYTE $0x03; BYTE $0x68 // la 2,872(2) + BYTE $0xB9; BYTE $0x82; BYTE $0x00; BYTE $0x33 // xgr 3,3 + BYTE $0xA7; BYTE $0x55; BYTE $0x00; BYTE $0x04 // bras 5,lbl1 + BYTE $0xA7; BYTE $0x39; BYTE $0x00; BYTE $0x01 // lghi 3,1 + BYTE $0xB9; BYTE $0x02; BYTE $0x00; BYTE $0x33 // lbl1 ltgr 3,3 + BYTE $0xA7; BYTE $0x74; BYTE $0x00; BYTE $0x08 // brc b'0111',lbl2 + BYTE $0xE3; BYTE $0x52; BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x24 // stg 5,0(2) + BYTE $0xE3; BYTE $0x6A; BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x04 // lg 6,0(10) + BYTE $0xB9; BYTE $0x82; BYTE $0x00; BYTE $0x99 // lbl2 xgr 9,9 + BYTE $0xE3; BYTE $0x92; BYTE $0x00; BYTE $0x00; BYTE $0x00; BYTE $0x24 // stg 9,0(2) + MOVD R6, value+8(FP) // result in R6 + MOVD R3, error+16(FP) // error in R3 + RET |
