diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/csky/kernel/probes/simulate-insn.c | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/arch/csky/kernel/probes/simulate-insn.c b/arch/csky/kernel/probes/simulate-insn.c new file mode 100644 index 000000000..4e464fed5 --- /dev/null +++ b/arch/csky/kernel/probes/simulate-insn.c @@ -0,0 +1,398 @@ +// SPDX-License-Identifier: GPL-2.0+ + +#include <linux/bitops.h> +#include <linux/kernel.h> +#include <linux/kprobes.h> + +#include "decode-insn.h" +#include "simulate-insn.h" + +static inline bool csky_insn_reg_get_val(struct pt_regs *regs, + unsigned long index, + unsigned long *ptr) +{ + if (index < 14) + *ptr = *(®s->a0 + index); + + if (index > 15 && index < 31) + *ptr = *(®s->exregs[0] + index - 16); + + switch (index) { + case 14: + *ptr = regs->usp; + break; + case 15: + *ptr = regs->lr; + break; + case 31: + *ptr = regs->tls; + break; + default: + goto fail; + } + + return true; +fail: + return false; +} + +static inline bool csky_insn_reg_set_val(struct pt_regs *regs, + unsigned long index, + unsigned long val) +{ + if (index < 14) + *(®s->a0 + index) = val; + + if (index > 15 && index < 31) + *(®s->exregs[0] + index - 16) = val; + + switch (index) { + case 14: + regs->usp = val; + break; + case 15: + regs->lr = val; + break; + case 31: + regs->tls = val; + break; + default: + goto fail; + } + + return true; +fail: + return false; +} + +void __kprobes +simulate_br16(u32 opcode, long addr, struct pt_regs *regs) +{ + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0x3ff) << 1, 9)); +} + +void __kprobes +simulate_br32(u32 opcode, long addr, struct pt_regs *regs) +{ + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); +} + +void __kprobes +simulate_bt16(u32 opcode, long addr, struct pt_regs *regs) +{ + if (regs->sr & 1) + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0x3ff) << 1, 9)); + else + instruction_pointer_set(regs, addr + 2); +} + +void __kprobes +simulate_bt32(u32 opcode, long addr, struct pt_regs *regs) +{ + if (regs->sr & 1) + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + else + instruction_pointer_set(regs, addr + 4); +} + +void __kprobes +simulate_bf16(u32 opcode, long addr, struct pt_regs *regs) +{ + if (!(regs->sr & 1)) + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0x3ff) << 1, 9)); + else + instruction_pointer_set(regs, addr + 2); +} + +void __kprobes +simulate_bf32(u32 opcode, long addr, struct pt_regs *regs) +{ + if (!(regs->sr & 1)) + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + else + instruction_pointer_set(regs, addr + 4); +} + +void __kprobes +simulate_jmp16(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = (opcode >> 2) & 0xf; + + csky_insn_reg_get_val(regs, tmp, &tmp); + + instruction_pointer_set(regs, tmp & 0xfffffffe); +} + +void __kprobes +simulate_jmp32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + + csky_insn_reg_get_val(regs, tmp, &tmp); + + instruction_pointer_set(regs, tmp & 0xfffffffe); +} + +void __kprobes +simulate_jsr16(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = (opcode >> 2) & 0xf; + + csky_insn_reg_get_val(regs, tmp, &tmp); + + regs->lr = addr + 2; + + instruction_pointer_set(regs, tmp & 0xfffffffe); +} + +void __kprobes +simulate_jsr32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + + csky_insn_reg_get_val(regs, tmp, &tmp); + + regs->lr = addr + 4; + + instruction_pointer_set(regs, tmp & 0xfffffffe); +} + +void __kprobes +simulate_lrw16(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long val; + unsigned long tmp = (opcode & 0x300) >> 3; + unsigned long offset = ((opcode & 0x1f) | tmp) << 2; + + tmp = (opcode & 0xe0) >> 5; + + val = *(unsigned int *)(instruction_pointer(regs) + offset); + + csky_insn_reg_set_val(regs, tmp, val); +} + +void __kprobes +simulate_lrw32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long val; + unsigned long offset = (opcode & 0xffff0000) >> 14; + unsigned long tmp = opcode & 0x0000001f; + + val = *(unsigned int *) + ((instruction_pointer(regs) + offset) & 0xfffffffc); + + csky_insn_reg_set_val(regs, tmp, val); +} + +void __kprobes +simulate_pop16(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long *tmp = (unsigned long *)regs->usp; + int i; + + for (i = 0; i < (opcode & 0xf); i++) { + csky_insn_reg_set_val(regs, i + 4, *tmp); + tmp += 1; + } + + if (opcode & 0x10) { + csky_insn_reg_set_val(regs, 15, *tmp); + tmp += 1; + } + + regs->usp = (unsigned long)tmp; + + instruction_pointer_set(regs, regs->lr); +} + +void __kprobes +simulate_pop32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long *tmp = (unsigned long *)regs->usp; + int i; + + for (i = 0; i < ((opcode & 0xf0000) >> 16); i++) { + csky_insn_reg_set_val(regs, i + 4, *tmp); + tmp += 1; + } + + if (opcode & 0x100000) { + csky_insn_reg_set_val(regs, 15, *tmp); + tmp += 1; + } + + for (i = 0; i < ((opcode & 0xe00000) >> 21); i++) { + csky_insn_reg_set_val(regs, i + 16, *tmp); + tmp += 1; + } + + if (opcode & 0x1000000) { + csky_insn_reg_set_val(regs, 29, *tmp); + tmp += 1; + } + + regs->usp = (unsigned long)tmp; + + instruction_pointer_set(regs, regs->lr); +} + +void __kprobes +simulate_bez32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + + csky_insn_reg_get_val(regs, tmp, &tmp); + + if (tmp == 0) { + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + } else + instruction_pointer_set(regs, addr + 4); +} + +void __kprobes +simulate_bnez32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + + csky_insn_reg_get_val(regs, tmp, &tmp); + + if (tmp != 0) { + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + } else + instruction_pointer_set(regs, addr + 4); +} + +void __kprobes +simulate_bnezad32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + unsigned long val; + + csky_insn_reg_get_val(regs, tmp, &val); + + val -= 1; + + if (val > 0) { + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + } else + instruction_pointer_set(regs, addr + 4); + + csky_insn_reg_set_val(regs, tmp, val); +} + +void __kprobes +simulate_bhsz32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + unsigned long val; + + csky_insn_reg_get_val(regs, tmp, &val); + + if (val >= 0) { + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + } else + instruction_pointer_set(regs, addr + 4); + + csky_insn_reg_set_val(regs, tmp, val); +} + +void __kprobes +simulate_bhz32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + unsigned long val; + + csky_insn_reg_get_val(regs, tmp, &val); + + if (val > 0) { + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + } else + instruction_pointer_set(regs, addr + 4); + + csky_insn_reg_set_val(regs, tmp, val); +} + +void __kprobes +simulate_blsz32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + unsigned long val; + + csky_insn_reg_get_val(regs, tmp, &val); + + if (val <= 0) { + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + } else + instruction_pointer_set(regs, addr + 4); + + csky_insn_reg_set_val(regs, tmp, val); +} + +void __kprobes +simulate_blz32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp = opcode & 0x1f; + unsigned long val; + + csky_insn_reg_get_val(regs, tmp, &val); + + if (val < 0) { + instruction_pointer_set(regs, + addr + sign_extend32((opcode & 0xffff0000) >> 15, 15)); + } else + instruction_pointer_set(regs, addr + 4); + + csky_insn_reg_set_val(regs, tmp, val); +} + +void __kprobes +simulate_bsr32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long tmp; + + tmp = (opcode & 0xffff) << 16; + tmp |= (opcode & 0xffff0000) >> 16; + + instruction_pointer_set(regs, + addr + sign_extend32((tmp & 0x3ffffff) << 1, 15)); + + regs->lr = addr + 4; +} + +void __kprobes +simulate_jmpi32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long val; + unsigned long offset = ((opcode & 0xffff0000) >> 14); + + val = *(unsigned int *) + ((instruction_pointer(regs) + offset) & 0xfffffffc); + + instruction_pointer_set(regs, val); +} + +void __kprobes +simulate_jsri32(u32 opcode, long addr, struct pt_regs *regs) +{ + unsigned long val; + unsigned long offset = ((opcode & 0xffff0000) >> 14); + + val = *(unsigned int *) + ((instruction_pointer(regs) + offset) & 0xfffffffc); + + regs->lr = addr + 4; + + instruction_pointer_set(regs, val); +} |