| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Martin Schwidefsky | 2633 | 50.68% | 9 | 25.00% |
| Heiko Carstens | 2483 | 47.80% | 14 | 38.89% |
| Jan Glauber | 32 | 0.62% | 2 | 5.56% |
| Ilya Leoshkevich | 27 | 0.52% | 1 | 2.78% |
| Suzuki K. Poulose | 7 | 0.13% | 2 | 5.56% |
| Christian Bornträger | 4 | 0.08% | 1 | 2.78% |
| Adrian Bunk | 3 | 0.06% | 1 | 2.78% |
| Vasily Gorbik | 3 | 0.06% | 3 | 8.33% |
| Paul Gortmaker | 1 | 0.02% | 1 | 2.78% |
| Greg Kroah-Hartman | 1 | 0.02% | 1 | 2.78% |
| Linus Torvalds | 1 | 0.02% | 1 | 2.78% |
| Total | 5195 | 36 |
// SPDX-License-Identifier: GPL-2.0 /* * Disassemble s390 instructions. * * Copyright IBM Corp. 2007 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), */ #include <linux/sched.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/ptrace.h> #include <linux/timer.h> #include <linux/mm.h> #include <linux/smp.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/export.h> #include <linux/kallsyms.h> #include <linux/reboot.h> #include <linux/kprobes.h> #include <linux/kdebug.h> #include <linux/uaccess.h> #include <linux/atomic.h> #include <asm/dis.h> #include <asm/io.h> #include <asm/cpcmd.h> #include <asm/lowcore.h> #include <asm/debug.h> #include <asm/irq.h> /* Type of operand */ #define OPERAND_GPR 0x1 /* Operand printed as %rx */ #define OPERAND_FPR 0x2 /* Operand printed as %fx */ #define OPERAND_AR 0x4 /* Operand printed as %ax */ #define OPERAND_CR 0x8 /* Operand printed as %cx */ #define OPERAND_VR 0x10 /* Operand printed as %vx */ #define OPERAND_DISP 0x20 /* Operand printed as displacement */ #define OPERAND_BASE 0x40 /* Operand printed as base register */ #define OPERAND_INDEX 0x80 /* Operand printed as index register */ #define OPERAND_PCREL 0x100 /* Operand printed as pc-relative symbol */ #define OPERAND_SIGNED 0x200 /* Operand printed as signed value */ #define OPERAND_LENGTH 0x400 /* Operand printed as length (+1) */ struct s390_operand { unsigned char bits; /* The number of bits in the operand. */ unsigned char shift; /* The number of bits to shift. */ unsigned short flags; /* One bit syntax flags. */ }; struct s390_insn { union { const char name[5]; struct { unsigned char zero; unsigned int offset; } __packed; }; unsigned char opfrag; unsigned char format; }; struct s390_opcode_offset { unsigned char opcode; unsigned char mask; unsigned char byte; unsigned short offset; unsigned short count; } __packed; enum { UNUSED, A_8, /* Access reg. starting at position 8 */ A_12, /* Access reg. starting at position 12 */ A_24, /* Access reg. starting at position 24 */ A_28, /* Access reg. starting at position 28 */ B_16, /* Base register starting at position 16 */ B_32, /* Base register starting at position 32 */ C_8, /* Control reg. starting at position 8 */ C_12, /* Control reg. starting at position 12 */ D20_20, /* 20 bit displacement starting at 20 */ D_20, /* Displacement starting at position 20 */ D_36, /* Displacement starting at position 36 */ F_8, /* FPR starting at position 8 */ F_12, /* FPR starting at position 12 */ F_16, /* FPR starting at position 16 */ F_24, /* FPR starting at position 24 */ F_28, /* FPR starting at position 28 */ F_32, /* FPR starting at position 32 */ I8_8, /* 8 bit signed value starting at 8 */ I8_32, /* 8 bit signed value starting at 32 */ I16_16, /* 16 bit signed value starting at 16 */ I16_32, /* 16 bit signed value starting at 32 */ I32_16, /* 32 bit signed value starting at 16 */ J12_12, /* 12 bit PC relative offset at 12 */ J16_16, /* 16 bit PC relative offset at 16 */ J16_32, /* 16 bit PC relative offset at 32 */ J24_24, /* 24 bit PC relative offset at 24 */ J32_16, /* 32 bit PC relative offset at 16 */ L4_8, /* 4 bit length starting at position 8 */ L4_12, /* 4 bit length starting at position 12 */ L8_8, /* 8 bit length starting at position 8 */ R_8, /* GPR starting at position 8 */ R_12, /* GPR starting at position 12 */ R_16, /* GPR starting at position 16 */ R_24, /* GPR starting at position 24 */ R_28, /* GPR starting at position 28 */ U4_8, /* 4 bit unsigned value starting at 8 */ U4_12, /* 4 bit unsigned value starting at 12 */ U4_16, /* 4 bit unsigned value starting at 16 */ U4_20, /* 4 bit unsigned value starting at 20 */ U4_24, /* 4 bit unsigned value starting at 24 */ U4_28, /* 4 bit unsigned value starting at 28 */ U4_32, /* 4 bit unsigned value starting at 32 */ U4_36, /* 4 bit unsigned value starting at 36 */ U8_8, /* 8 bit unsigned value starting at 8 */ U8_16, /* 8 bit unsigned value starting at 16 */ U8_24, /* 8 bit unsigned value starting at 24 */ U8_28, /* 8 bit unsigned value starting at 28 */ U8_32, /* 8 bit unsigned value starting at 32 */ U12_16, /* 12 bit unsigned value starting at 16 */ U16_16, /* 16 bit unsigned value starting at 16 */ U16_32, /* 16 bit unsigned value starting at 32 */ U32_16, /* 32 bit unsigned value starting at 16 */ VX_12, /* Vector index register starting at position 12 */ V_8, /* Vector reg. starting at position 8 */ V_12, /* Vector reg. starting at position 12 */ V_16, /* Vector reg. starting at position 16 */ V_32, /* Vector reg. starting at position 32 */ X_12, /* Index register starting at position 12 */ }; static const struct s390_operand operands[] = { [UNUSED] = { 0, 0, 0 }, [A_8] = { 4, 8, OPERAND_AR }, [A_12] = { 4, 12, OPERAND_AR }, [A_24] = { 4, 24, OPERAND_AR }, [A_28] = { 4, 28, OPERAND_AR }, [B_16] = { 4, 16, OPERAND_BASE | OPERAND_GPR }, [B_32] = { 4, 32, OPERAND_BASE | OPERAND_GPR }, [C_8] = { 4, 8, OPERAND_CR }, [C_12] = { 4, 12, OPERAND_CR }, [D20_20] = { 20, 20, OPERAND_DISP | OPERAND_SIGNED }, [D_20] = { 12, 20, OPERAND_DISP }, [D_36] = { 12, 36, OPERAND_DISP }, [F_8] = { 4, 8, OPERAND_FPR }, [F_12] = { 4, 12, OPERAND_FPR }, [F_16] = { 4, 16, OPERAND_FPR }, [F_24] = { 4, 24, OPERAND_FPR }, [F_28] = { 4, 28, OPERAND_FPR }, [F_32] = { 4, 32, OPERAND_FPR }, [I8_8] = { 8, 8, OPERAND_SIGNED }, [I8_32] = { 8, 32, OPERAND_SIGNED }, [I16_16] = { 16, 16, OPERAND_SIGNED }, [I16_32] = { 16, 32, OPERAND_SIGNED }, [I32_16] = { 32, 16, OPERAND_SIGNED }, [J12_12] = { 12, 12, OPERAND_PCREL }, [J16_16] = { 16, 16, OPERAND_PCREL }, [J16_32] = { 16, 32, OPERAND_PCREL }, [J24_24] = { 24, 24, OPERAND_PCREL }, [J32_16] = { 32, 16, OPERAND_PCREL }, [L4_8] = { 4, 8, OPERAND_LENGTH }, [L4_12] = { 4, 12, OPERAND_LENGTH }, [L8_8] = { 8, 8, OPERAND_LENGTH }, [R_8] = { 4, 8, OPERAND_GPR }, [R_12] = { 4, 12, OPERAND_GPR }, [R_16] = { 4, 16, OPERAND_GPR }, [R_24] = { 4, 24, OPERAND_GPR }, [R_28] = { 4, 28, OPERAND_GPR }, [U4_8] = { 4, 8, 0 }, [U4_12] = { 4, 12, 0 }, [U4_16] = { 4, 16, 0 }, [U4_20] = { 4, 20, 0 }, [U4_24] = { 4, 24, 0 }, [U4_28] = { 4, 28, 0 }, [U4_32] = { 4, 32, 0 }, [U4_36] = { 4, 36, 0 }, [U8_8] = { 8, 8, 0 }, [U8_16] = { 8, 16, 0 }, [U8_24] = { 8, 24, 0 }, [U8_28] = { 8, 28, 0 }, [U8_32] = { 8, 32, 0 }, [U12_16] = { 12, 16, 0 }, [U16_16] = { 16, 16, 0 }, [U16_32] = { 16, 32, 0 }, [U32_16] = { 32, 16, 0 }, [VX_12] = { 4, 12, OPERAND_INDEX | OPERAND_VR }, [V_8] = { 4, 8, OPERAND_VR }, [V_12] = { 4, 12, OPERAND_VR }, [V_16] = { 4, 16, OPERAND_VR }, [V_32] = { 4, 32, OPERAND_VR }, [X_12] = { 4, 12, OPERAND_INDEX | OPERAND_GPR }, }; static const unsigned char formats[][6] = { [INSTR_E] = { 0, 0, 0, 0, 0, 0 }, [INSTR_IE_UU] = { U4_24, U4_28, 0, 0, 0, 0 }, [INSTR_MII_UPP] = { U4_8, J12_12, J24_24 }, [INSTR_RIE_R0IU] = { R_8, I16_16, U4_32, 0, 0, 0 }, [INSTR_RIE_R0UU] = { R_8, U16_16, U4_32, 0, 0, 0 }, [INSTR_RIE_RRI0] = { R_8, R_12, I16_16, 0, 0, 0 }, [INSTR_RIE_RRP] = { R_8, R_12, J16_16, 0, 0, 0 }, [INSTR_RIE_RRPU] = { R_8, R_12, U4_32, J16_16, 0, 0 }, [INSTR_RIE_RRUUU] = { R_8, R_12, U8_16, U8_24, U8_32, 0 }, [INSTR_RIE_RUI0] = { R_8, I16_16, U4_12, 0, 0, 0 }, [INSTR_RIE_RUPI] = { R_8, I8_32, U4_12, J16_16, 0, 0 }, [INSTR_RIE_RUPU] = { R_8, U8_32, U4_12, J16_16, 0, 0 }, [INSTR_RIL_RI] = { R_8, I32_16, 0, 0, 0, 0 }, [INSTR_RIL_RP] = { R_8, J32_16, 0, 0, 0, 0 }, [INSTR_RIL_RU] = { R_8, U32_16, 0, 0, 0, 0 }, [INSTR_RIL_UP] = { U4_8, J32_16, 0, 0, 0, 0 }, [INSTR_RIS_RURDI] = { R_8, I8_32, U4_12, D_20, B_16, 0 }, [INSTR_RIS_RURDU] = { R_8, U8_32, U4_12, D_20, B_16, 0 }, [INSTR_RI_RI] = { R_8, I16_16, 0, 0, 0, 0 }, [INSTR_RI_RP] = { R_8, J16_16, 0, 0, 0, 0 }, [INSTR_RI_RU] = { R_8, U16_16, 0, 0, 0, 0 }, [INSTR_RI_UP] = { U4_8, J16_16, 0, 0, 0, 0 }, [INSTR_RRE_00] = { 0, 0, 0, 0, 0, 0 }, [INSTR_RRE_AA] = { A_24, A_28, 0, 0, 0, 0 }, [INSTR_RRE_AR] = { A_24, R_28, 0, 0, 0, 0 }, [INSTR_RRE_F0] = { F_24, 0, 0, 0, 0, 0 }, [INSTR_RRE_FF] = { F_24, F_28, 0, 0, 0, 0 }, [INSTR_RRE_FR] = { F_24, R_28, 0, 0, 0, 0 }, [INSTR_RRE_R0] = { R_24, 0, 0, 0, 0, 0 }, [INSTR_RRE_RA] = { R_24, A_28, 0, 0, 0, 0 }, [INSTR_RRE_RF] = { R_24, F_28, 0, 0, 0, 0 }, [INSTR_RRE_RR] = { R_24, R_28, 0, 0, 0, 0 }, [INSTR_RRF_0UFF] = { F_24, F_28, U4_20, 0, 0, 0 }, [INSTR_RRF_0URF] = { R_24, F_28, U4_20, 0, 0, 0 }, [INSTR_RRF_F0FF] = { F_16, F_24, F_28, 0, 0, 0 }, [INSTR_RRF_F0FF2] = { F_24, F_16, F_28, 0, 0, 0 }, [INSTR_RRF_F0FR] = { F_24, F_16, R_28, 0, 0, 0 }, [INSTR_RRF_FFRU] = { F_24, F_16, R_28, U4_20, 0, 0 }, [INSTR_RRF_FUFF] = { F_24, F_16, F_28, U4_20, 0, 0 }, [INSTR_RRF_FUFF2] = { F_24, F_28, F_16, U4_20, 0, 0 }, [INSTR_RRF_R0RR] = { R_24, R_16, R_28, 0, 0, 0 }, [INSTR_RRF_R0RR2] = { R_24, R_28, R_16, 0, 0, 0 }, [INSTR_RRF_RURR] = { R_24, R_28, R_16, U4_20, 0, 0 }, [INSTR_RRF_RURR2] = { R_24, R_16, R_28, U4_20, 0, 0 }, [INSTR_RRF_U0FF] = { F_24, U4_16, F_28, 0, 0, 0 }, [INSTR_RRF_U0RF] = { R_24, U4_16, F_28, 0, 0, 0 }, [INSTR_RRF_U0RR] = { R_24, R_28, U4_16, 0, 0, 0 }, [INSTR_RRF_URR] = { R_24, R_28, U8_16, 0, 0, 0 }, [INSTR_RRF_UUFF] = { F_24, U4_16, F_28, U4_20, 0, 0 }, [INSTR_RRF_UUFR] = { F_24, U4_16, R_28, U4_20, 0, 0 }, [INSTR_RRF_UURF] = { R_24, U4_16, F_28, U4_20, 0, 0 }, [INSTR_RRS_RRRDU] = { R_8, R_12, U4_32, D_20, B_16 }, [INSTR_RR_FF] = { F_8, F_12, 0, 0, 0, 0 }, [INSTR_RR_R0] = { R_8, 0, 0, 0, 0, 0 }, [INSTR_RR_RR] = { R_8, R_12, 0, 0, 0, 0 }, [INSTR_RR_U0] = { U8_8, 0, 0, 0, 0, 0 }, [INSTR_RR_UR] = { U4_8, R_12, 0, 0, 0, 0 }, [INSTR_RSI_RRP] = { R_8, R_12, J16_16, 0, 0, 0 }, [INSTR_RSL_LRDFU] = { F_32, D_20, L8_8, B_16, U4_36, 0 }, [INSTR_RSL_R0RD] = { D_20, L4_8, B_16, 0, 0, 0 }, [INSTR_RSY_AARD] = { A_8, A_12, D20_20, B_16, 0, 0 }, [INSTR_RSY_CCRD] = { C_8, C_12, D20_20, B_16, 0, 0 }, [INSTR_RSY_RDRU] = { R_8, D20_20, B_16, U4_12, 0, 0 }, [INSTR_RSY_RRRD] = { R_8, R_12, D20_20, B_16, 0, 0 }, [INSTR_RSY_RURD] = { R_8, U4_12, D20_20, B_16, 0, 0 }, [INSTR_RSY_RURD2] = { R_8, D20_20, B_16, U4_12, 0, 0 }, [INSTR_RS_AARD] = { A_8, A_12, D_20, B_16, 0, 0 }, [INSTR_RS_CCRD] = { C_8, C_12, D_20, B_16, 0, 0 }, [INSTR_RS_R0RD] = { R_8, D_20, B_16, 0, 0, 0 }, [INSTR_RS_RRRD] = { R_8, R_12, D_20, B_16, 0, 0 }, [INSTR_RS_RURD] = { R_8, U4_12, D_20, B_16, 0, 0 }, [INSTR_RXE_FRRD] = { F_8, D_20, X_12, B_16, 0, 0 }, [INSTR_RXE_RRRDU] = { R_8, D_20, X_12, B_16, U4_32, 0 }, [INSTR_RXF_FRRDF] = { F_32, F_8, D_20, X_12, B_16, 0 }, [INSTR_RXY_FRRD] = { F_8, D20_20, X_12, B_16, 0, 0 }, [INSTR_RXY_RRRD] = { R_8, D20_20, X_12, B_16, 0, 0 }, [INSTR_RXY_URRD] = { U4_8, D20_20, X_12, B_16, 0, 0 }, [INSTR_RX_FRRD] = { F_8, D_20, X_12, B_16, 0, 0 }, [INSTR_RX_RRRD] = { R_8, D_20, X_12, B_16, 0, 0 }, [INSTR_RX_URRD] = { U4_8, D_20, X_12, B_16, 0, 0 }, [INSTR_SIL_RDI] = { D_20, B_16, I16_32, 0, 0, 0 }, [INSTR_SIL_RDU] = { D_20, B_16, U16_32, 0, 0, 0 }, [INSTR_SIY_IRD] = { D20_20, B_16, I8_8, 0, 0, 0 }, [INSTR_SIY_URD] = { D20_20, B_16, U8_8, 0, 0, 0 }, [INSTR_SI_RD] = { D_20, B_16, 0, 0, 0, 0 }, [INSTR_SI_URD] = { D_20, B_16, U8_8, 0, 0, 0 }, [INSTR_SMI_U0RDP] = { U4_8, J16_32, D_20, B_16, 0, 0 }, [INSTR_SSE_RDRD] = { D_20, B_16, D_36, B_32, 0, 0 }, [INSTR_SSF_RRDRD] = { D_20, B_16, D_36, B_32, R_8, 0 }, [INSTR_SSF_RRDRD2] = { R_8, D_20, B_16, D_36, B_32, 0 }, [INSTR_SS_L0RDRD] = { D_20, L8_8, B_16, D_36, B_32, 0 }, [INSTR_SS_L2RDRD] = { D_20, B_16, D_36, L8_8, B_32, 0 }, [INSTR_SS_LIRDRD] = { D_20, L4_8, B_16, D_36, B_32, U4_12 }, [INSTR_SS_LLRDRD] = { D_20, L4_8, B_16, D_36, L4_12, B_32 }, [INSTR_SS_RRRDRD] = { D_20, R_8, B_16, D_36, B_32, R_12 }, [INSTR_SS_RRRDRD2] = { R_8, D_20, B_16, R_12, D_36, B_32 }, [INSTR_SS_RRRDRD3] = { R_8, R_12, D_20, B_16, D_36, B_32 }, [INSTR_S_00] = { 0, 0, 0, 0, 0, 0 }, [INSTR_S_RD] = { D_20, B_16, 0, 0, 0, 0 }, [INSTR_VRI_V0IU] = { V_8, I16_16, U4_32, 0, 0, 0 }, [INSTR_VRI_V0U] = { V_8, U16_16, 0, 0, 0, 0 }, [INSTR_VRI_V0UU2] = { V_8, U16_16, U4_32, 0, 0, 0 }, [INSTR_VRI_V0UUU] = { V_8, U8_16, U8_24, U4_32, 0, 0 }, [INSTR_VRI_VR0UU] = { V_8, R_12, U8_28, U4_24, 0, 0 }, [INSTR_VRI_VVUU] = { V_8, V_12, U16_16, U4_32, 0, 0 }, [INSTR_VRI_VVUUU] = { V_8, V_12, U12_16, U4_32, U4_28, 0 }, [INSTR_VRI_VVUUU2] = { V_8, V_12, U8_28, U8_16, U4_24, 0 }, [INSTR_VRI_VVV0U] = { V_8, V_12, V_16, U8_24, 0, 0 }, [INSTR_VRI_VVV0UU] = { V_8, V_12, V_16, U8_24, U4_32, 0 }, [INSTR_VRI_VVV0UU2] = { V_8, V_12, V_16, U8_28, U4_24, 0 }, [INSTR_VRR_0V] = { V_12, 0, 0, 0, 0, 0 }, [INSTR_VRR_0VV0U] = { V_12, V_16, U4_24, 0, 0, 0 }, [INSTR_VRR_RV0UU] = { R_8, V_12, U4_24, U4_28, 0, 0 }, [INSTR_VRR_VRR] = { V_8, R_12, R_16, 0, 0, 0 }, [INSTR_VRR_VV] = { V_8, V_12, 0, 0, 0, 0 }, [INSTR_VRR_VV0U] = { V_8, V_12, U4_32, 0, 0, 0 }, [INSTR_VRR_VV0U0U] = { V_8, V_12, U4_32, U4_24, 0, 0 }, [INSTR_VRR_VV0UU2] = { V_8, V_12, U4_32, U4_28, 0, 0 }, [INSTR_VRR_VV0UUU] = { V_8, V_12, U4_32, U4_28, U4_24, 0 }, [INSTR_VRR_VVV] = { V_8, V_12, V_16, 0, 0, 0 }, [INSTR_VRR_VVV0U] = { V_8, V_12, V_16, U4_32, 0, 0 }, [INSTR_VRR_VVV0U0U] = { V_8, V_12, V_16, U4_32, U4_24, 0 }, [INSTR_VRR_VVV0UU] = { V_8, V_12, V_16, U4_32, U4_28, 0 }, [INSTR_VRR_VVV0UUU] = { V_8, V_12, V_16, U4_32, U4_28, U4_24 }, [INSTR_VRR_VVV0V] = { V_8, V_12, V_16, V_32, 0, 0 }, [INSTR_VRR_VVVU0UV] = { V_8, V_12, V_16, V_32, U4_28, U4_20 }, [INSTR_VRR_VVVU0V] = { V_8, V_12, V_16, V_32, U4_20, 0 }, [INSTR_VRR_VVVUU0V] = { V_8, V_12, V_16, V_32, U4_20, U4_24 }, [INSTR_VRS_RRDV] = { V_32, R_12, D_20, B_16, 0, 0 }, [INSTR_VRS_RVRDU] = { R_8, V_12, D_20, B_16, U4_32, 0 }, [INSTR_VRS_VRRD] = { V_8, R_12, D_20, B_16, 0, 0 }, [INSTR_VRS_VRRDU] = { V_8, R_12, D_20, B_16, U4_32, 0 }, [INSTR_VRS_VVRDU] = { V_8, V_12, D_20, B_16, U4_32, 0 }, [INSTR_VRV_VVXRDU] = { V_8, D_20, VX_12, B_16, U4_32, 0 }, [INSTR_VRX_VRRDU] = { V_8, D_20, X_12, B_16, U4_32, 0 }, [INSTR_VRX_VV] = { V_8, V_12, 0, 0, 0, 0 }, [INSTR_VSI_URDV] = { V_32, D_20, B_16, U8_8, 0, 0 }, }; static char long_insn_name[][7] = LONG_INSN_INITIALIZER; static struct s390_insn opcode[] = OPCODE_TABLE_INITIALIZER; static struct s390_opcode_offset opcode_offset[] = OPCODE_OFFSET_INITIALIZER; /* Extracts an operand value from an instruction. */ static unsigned int extract_operand(unsigned char *code, const struct s390_operand *operand) { unsigned char *cp; unsigned int val; int bits; /* Extract fragments of the operand byte for byte. */ cp = code + operand->shift / 8; bits = (operand->shift & 7) + operand->bits; val = 0; do { val <<= 8; val |= (unsigned int) *cp++; bits -= 8; } while (bits > 0); val >>= -bits; val &= ((1U << (operand->bits - 1)) << 1) - 1; /* Check for special long displacement case. */ if (operand->bits == 20 && operand->shift == 20) val = (val & 0xff) << 12 | (val & 0xfff00) >> 8; /* Check for register extensions bits for vector registers. */ if (operand->flags & OPERAND_VR) { if (operand->shift == 8) val |= (code[4] & 8) << 1; else if (operand->shift == 12) val |= (code[4] & 4) << 2; else if (operand->shift == 16) val |= (code[4] & 2) << 3; else if (operand->shift == 32) val |= (code[4] & 1) << 4; } /* Sign extend value if the operand is signed or pc relative. */ if ((operand->flags & (OPERAND_SIGNED | OPERAND_PCREL)) && (val & (1U << (operand->bits - 1)))) val |= (-1U << (operand->bits - 1)) << 1; /* Double value if the operand is pc relative. */ if (operand->flags & OPERAND_PCREL) val <<= 1; /* Length x in an instructions has real length x + 1. */ if (operand->flags & OPERAND_LENGTH) val++; return val; } struct s390_insn *find_insn(unsigned char *code) { struct s390_opcode_offset *entry; struct s390_insn *insn; unsigned char opfrag; int i; /* Search the opcode offset table to find an entry which * matches the beginning of the opcode. If there is no match * the last entry will be used, which is the default entry for * unknown instructions as well as 1-byte opcode instructions. */ for (i = 0; i < ARRAY_SIZE(opcode_offset); i++) { entry = &opcode_offset[i]; if (entry->opcode == code[0]) break; } opfrag = *(code + entry->byte) & entry->mask; insn = &opcode[entry->offset]; for (i = 0; i < entry->count; i++) { if (insn->opfrag == opfrag) return insn; insn++; } return NULL; } static int print_insn(char *buffer, unsigned char *code, unsigned long addr) { struct s390_insn *insn; const unsigned char *ops; const struct s390_operand *operand; unsigned int value; char separator; char *ptr; int i; ptr = buffer; insn = find_insn(code); if (insn) { if (insn->zero == 0) ptr += sprintf(ptr, "%.7s\t", long_insn_name[insn->offset]); else ptr += sprintf(ptr, "%.5s\t", insn->name); /* Extract the operands. */ separator = 0; for (ops = formats[insn->format], i = 0; *ops != 0 && i < 6; ops++, i++) { operand = operands + *ops; value = extract_operand(code, operand); if ((operand->flags & OPERAND_INDEX) && value == 0) continue; if ((operand->flags & OPERAND_BASE) && value == 0 && separator == '(') { separator = ','; continue; } if (separator) ptr += sprintf(ptr, "%c", separator); if (operand->flags & OPERAND_GPR) ptr += sprintf(ptr, "%%r%i", value); else if (operand->flags & OPERAND_FPR) ptr += sprintf(ptr, "%%f%i", value); else if (operand->flags & OPERAND_AR) ptr += sprintf(ptr, "%%a%i", value); else if (operand->flags & OPERAND_CR) ptr += sprintf(ptr, "%%c%i", value); else if (operand->flags & OPERAND_VR) ptr += sprintf(ptr, "%%v%i", value); else if (operand->flags & OPERAND_PCREL) { void *pcrel = (void *)((int)value + addr); ptr += sprintf(ptr, "%px", pcrel); } else if (operand->flags & OPERAND_SIGNED) ptr += sprintf(ptr, "%i", value); else ptr += sprintf(ptr, "%u", value); if (operand->flags & OPERAND_DISP) separator = '('; else if (operand->flags & OPERAND_BASE) { ptr += sprintf(ptr, ")"); separator = ','; } else separator = ','; } } else ptr += sprintf(ptr, "unknown"); return (int) (ptr - buffer); } static int copy_from_regs(struct pt_regs *regs, void *dst, void *src, int len) { if (user_mode(regs)) { if (copy_from_user(dst, (char __user *)src, len)) return -EFAULT; } else { if (copy_from_kernel_nofault(dst, src, len)) return -EFAULT; } return 0; } void show_code(struct pt_regs *regs) { char *mode = user_mode(regs) ? "User" : "Krnl"; unsigned char code[64]; char buffer[128], *ptr; unsigned long addr; int start, end, opsize, hops, i; /* Get a snapshot of the 64 bytes surrounding the fault address. */ for (start = 32; start && regs->psw.addr >= 34 - start; start -= 2) { addr = regs->psw.addr - 34 + start; if (copy_from_regs(regs, code + start - 2, (void *)addr, 2)) break; } for (end = 32; end < 64; end += 2) { addr = regs->psw.addr + end - 32; if (copy_from_regs(regs, code + end, (void *)addr, 2)) break; } /* Code snapshot useable ? */ if ((regs->psw.addr & 1) || start >= end) { printk("%s Code: Bad PSW.\n", mode); return; } /* Find a starting point for the disassembly. */ while (start < 32) { for (i = 0, hops = 0; start + i < 32 && hops < 3; hops++) { if (!find_insn(code + start + i)) break; i += insn_length(code[start + i]); } if (start + i == 32) /* Looks good, sequence ends at PSW. */ break; start += 2; } /* Decode the instructions. */ ptr = buffer; ptr += sprintf(ptr, "%s Code:", mode); hops = 0; while (start < end && hops < 8) { opsize = insn_length(code[start]); if (start + opsize == 32) *ptr++ = '#'; else if (start == 32) *ptr++ = '>'; else *ptr++ = ' '; addr = regs->psw.addr + start - 32; ptr += sprintf(ptr, "%px: ", (void *)addr); if (start + opsize >= end) break; for (i = 0; i < opsize; i++) ptr += sprintf(ptr, "%02x", code[start + i]); *ptr++ = '\t'; if (i < 6) *ptr++ = '\t'; ptr += print_insn(ptr, code + start, addr); start += opsize; pr_cont("%s", buffer); ptr = buffer; ptr += sprintf(ptr, "\n "); hops++; } pr_cont("\n"); } void print_fn_code(unsigned char *code, unsigned long len) { char buffer[128], *ptr; int opsize, i; while (len) { ptr = buffer; opsize = insn_length(*code); if (opsize > len) break; ptr += sprintf(ptr, "%px: ", code); for (i = 0; i < opsize; i++) ptr += sprintf(ptr, "%02x", code[i]); *ptr++ = '\t'; if (i < 4) *ptr++ = '\t'; ptr += print_insn(ptr, code, (unsigned long) code); *ptr++ = '\n'; *ptr++ = 0; printk("%s", buffer); code += opsize; len -= opsize; } }
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