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// 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;
long val;
csky_insn_reg_get_val(regs, tmp, (unsigned long *)&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, (unsigned long)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 ((long) val >= 0) {
instruction_pointer_set(regs,
addr + sign_extend32((opcode & 0xffff0000) >> 15, 15));
} else
instruction_pointer_set(regs, addr + 4);
}
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 ((long) val > 0) {
instruction_pointer_set(regs,
addr + sign_extend32((opcode & 0xffff0000) >> 15, 15));
} else
instruction_pointer_set(regs, addr + 4);
}
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 ((long) val <= 0) {
instruction_pointer_set(regs,
addr + sign_extend32((opcode & 0xffff0000) >> 15, 15));
} else
instruction_pointer_set(regs, addr + 4);
}
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 ((long) val < 0) {
instruction_pointer_set(regs,
addr + sign_extend32((opcode & 0xffff0000) >> 15, 15));
} else
instruction_pointer_set(regs, addr + 4);
}
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);
}
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