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#pragma once
#include "arm64/assemble.h"
#define MAX_JUMP_PATCH_SIZE 12
#define MAX_REWRITTEN_SIZE (7 * 2 * 4) /* also conservative */
static inline int jump_patch_size(uintptr_t pc, uintptr_t dpc,
struct arch_dis_ctx arch,
bool force) {
intptr_t diff = (dpc & ~0xfff) - (pc & ~0xfff);
if (!(diff >= -0x100000000 && diff < 0x100000000))
return force ? 16 : -1;
else if (pc & 0xfff)
return 8;
else
return 12;
}
static inline void make_jump_patch(void **codep, uintptr_t pc, uintptr_t dpc,
struct arch_dis_ctx arch) {
int reg = 12; /* XXX */
intptr_t diff = (dpc & ~0xfff) - (pc & ~0xfff);
if (!(diff >= -0x100000000 && diff < 0x100000000))
MOVi64(codep, reg, dpc);
else
ADRP_ADD(codep, reg, pc, dpc);
BR(codep, reg);
}
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