496 lines
15 KiB
C
496 lines
15 KiB
C
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#ifdef _MSC_VER
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#include <intrin.h>
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#endif
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#include <fadec.h>
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#ifdef __GNUC__
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#define LIKELY(x) __builtin_expect((x), 1)
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#define UNLIKELY(x) __builtin_expect((x), 0)
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#define DECLARE_ARRAY_SIZE(n) static n
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#define DECLARE_RESTRICTED_ARRAY_SIZE(n) restrict static n
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#else
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#define LIKELY(x) (x)
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#define UNLIKELY(x) (x)
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#define DECLARE_ARRAY_SIZE(n) n
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#define DECLARE_RESTRICTED_ARRAY_SIZE(n) n
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#endif
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struct FdStr {
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const char* s;
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unsigned sz;
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};
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#define fd_stre(s) ((struct FdStr) { (s "\0\0\0\0\0\0\0\0\0\0"), sizeof (s)-1 })
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static char*
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fd_strplcpy(char* restrict dst, const char* src, size_t size) {
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while (*src && size > 1)
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*dst++ = *src++, size--;
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if (size)
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*dst = 0;
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return dst;
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}
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static char*
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fd_strpcat(char* restrict dst, struct FdStr src) {
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#ifdef __GNUC__
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unsigned lim = __builtin_constant_p(src.sz) && src.sz <= 8 ? 8 : 16;
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#else
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unsigned lim = 16;
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#endif
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for (unsigned i = 0; i < lim; i++)
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dst[i] = src.s[i];
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// __builtin_memcpy(dst, src.s, 16);
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return dst + src.sz;
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}
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static unsigned
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fd_clz64(uint64_t v) {
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#if defined(__GNUC__)
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return __builtin_clzl(v);
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#elif defined(_MSC_VER)
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unsigned long index;
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#if INTPTR_MAX == INT64_MAX
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_BitScanReverse64(&index, v);
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#else
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if (_BitScanReverse(&index, v >> 32))
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return 31 - index;
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_BitScanReverse(&index, v & 0xffffffff);
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#endif
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return 63 - index;
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#else
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#error Unsupported compiler.
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#endif
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}
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#if defined(__SSE2__)
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#include <immintrin.h>
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#endif
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static char*
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fd_strpcatnum(char dst[DECLARE_ARRAY_SIZE(18)], uint64_t val) {
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unsigned lz = fd_clz64(val|1);
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unsigned numbytes = 16 - (lz / 4);
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#if defined(__SSE2__)
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__m128i mv = _mm_set_epi64x(0, val << (lz & -4));
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__m128i mvp = _mm_unpacklo_epi8(mv, mv);
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__m128i mva = _mm_srli_epi16(mvp, 12);
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__m128i mvb = _mm_and_si128(mvp, _mm_set1_epi16(0x0f00u));
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__m128i ml = _mm_or_si128(mva, mvb);
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__m128i mn = _mm_or_si128(ml, _mm_set1_epi8(0x30));
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__m128i mgt = _mm_cmpgt_epi8(ml, _mm_set1_epi8(9));
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__m128i mgtm = _mm_and_si128(mgt, _mm_set1_epi8(0x61 - 0x3a));
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__m128i ma = _mm_add_epi8(mn, mgtm);
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__m128i msw = _mm_shufflehi_epi16(_mm_shufflelo_epi16(ma, 0x1b), 0x1b);
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__m128i ms = _mm_shuffle_epi32(msw, 0x4e);
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_mm_storeu_si128((__m128i_u*) (dst + 2), ms);
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#else
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unsigned idx = numbytes + 2;
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do {
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dst[--idx] = "0123456789abcdef"[val % 16];
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val /= 16;
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} while (val);
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#endif
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dst[0] = '0';
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dst[1] = 'x';
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return dst + numbytes + 2;
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}
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static char*
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fd_strpcatreg(char* restrict dst, unsigned rt, unsigned ri, unsigned size) {
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const char* nametab =
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"\2al\4bnd0\2cl\4bnd1\2dl\4bnd2\2bl\4bnd3"
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"\3spl\0 \3bpl\0 \3sil\0 \3dil\0 "
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"\3r8b\0 \3r9b\0 \4r10b\0 \4r11b\0 "
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"\4r12b\2ah\4r13b\2ch\4r14b\2dh\4r15b\2bh\0\0 "
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"\2ax\4tmm0\2cx\4tmm1\2dx\4tmm2\2bx\4tmm3"
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"\2sp\4tmm4\2bp\4tmm5\2si\4tmm6\2di\4tmm7"
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"\3r8w \2es\3r9w \2cs\4r10w\2ss\4r11w\2ds"
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"\4r12w\2fs\4r13w\2gs\4r14w\0 \4r15w\0 \2ip\0 "
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"\3eax\3mm0\3ecx\3mm1\3edx\3mm2\3ebx\3mm3"
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"\3esp\3mm4\3ebp\3mm5\3esi\3mm6\3edi\3mm7"
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"\3r8d \2k0\3r9d \2k1\4r10d\2k2\4r11d\2k3"
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"\4r12d\2k4\4r13d\2k5\4r14d\2k6\4r15d\2k7\3eip\0 "
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"\4xmm0\0 \4xmm1\0 \4xmm2\0 \4xmm3\0 "
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"\4xmm4\0 \4xmm5\0 \4xmm6\0 \4xmm7\0 "
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"\4xmm8\0 \4xmm9\0 \5xmm10\0 \5xmm11\0 "
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"\5xmm12\0 \5xmm13\0 \5xmm14\0 \5xmm15\0 \0\0 "
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"\3rax\3cr0\3rcx\0 \3rdx\3cr2\3rbx\3cr3"
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"\3rsp\3cr4\3rbp\0 \3rsi\0 \3rdi\0 "
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"\2r8 \3cr8\2r9 \3dr0\3r10\3dr1\3r11\3dr2"
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"\3r12\3dr3\3r13\3dr4\3r14\3dr5\3r15\3dr6\3rip\3dr7"
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"\5st(0)\0 \5st(1)\0 \5st(2)\0 \5st(3)\0 "
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"\5st(4)\0 \5st(5)\0 \5st(6)\0 \5st(7)\0 ";
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static const uint16_t nametabidx[] = {
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[FD_RT_GPL] = 0 * 17*8 + 0 * 8 + 0, // 1 * 17*8, 2 * 17*8, 4 * 17*8
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[FD_RT_GPH] = 0 * 17*8 + 8 * 8 + 5,
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[FD_RT_SEG] = 1 * 17*8 + 8 * 8 + 5,
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[FD_RT_FPU] = 5 * 17*8 + 0 * 8 + 0,
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[FD_RT_MMX] = 2 * 17*8 + 0 * 8 + 4,
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[FD_RT_VEC] = 3 * 17*8 + 0 * 8 + 0,
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[FD_RT_MASK]= 2 * 17*8 + 8 * 8 + 5,
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[FD_RT_BND] = 0 * 17*8 + 0 * 8 + 3,
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[FD_RT_CR] = 4 * 17*8 + 0 * 8 + 4,
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[FD_RT_DR] = 4 * 17*8 + 9 * 8 + 4,
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// [FD_RT_TMM] = 1 * 17*8 + 0 * 8 + 3,
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};
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unsigned idx = nametabidx[rt] + (rt == FD_RT_GPL ? (size >> 1) * 17*8 : 0);
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const char* name = nametab + idx + 8*ri;
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for (unsigned i = 0; i < 8; i++)
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dst[i] = name[i+1];
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if (UNLIKELY(rt == FD_RT_VEC))
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dst[0] += size >> 5;
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return dst + *name;
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}
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const char*
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fdi_name(FdInstrType ty) {
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(void) ty;
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return "(invalid)";
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}
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static char*
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fd_mnemonic(char buf[DECLARE_RESTRICTED_ARRAY_SIZE(48)], const FdInstr* instr) {
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#define FD_DECODE_TABLE_STRTAB1
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static const char* mnemonic_str =
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#include <fadec-decode-private.inc>
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"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; // 15 NULL Bytes to prevent overflow
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#undef FD_DECODE_TABLE_STRTAB1
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#define FD_DECODE_TABLE_STRTAB2
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static const uint16_t mnemonic_offs[] = {
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#include <fadec-decode-private.inc>
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};
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#undef FD_DECODE_TABLE_STRTAB2
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#define FD_DECODE_TABLE_STRTAB3
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static const uint8_t mnemonic_lens[] = {
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#include <fadec-decode-private.inc>
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};
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#undef FD_DECODE_TABLE_STRTAB3
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const char* mnem = &mnemonic_str[mnemonic_offs[FD_TYPE(instr)]];
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unsigned mnemlen = mnemonic_lens[FD_TYPE(instr)];
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bool prefix_xacq_xrel = false;
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bool prefix_segment = false;
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char sizesuffix[4] = {0};
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unsigned sizesuffixlen = 0;
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if (UNLIKELY(FD_OP_TYPE(instr, 0) == FD_OT_OFF && FD_OP_SIZE(instr, 0) == 2))
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sizesuffix[0] = 'w', sizesuffixlen = 1;
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switch (UNLIKELY(FD_TYPE(instr))) {
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case FDI_C_SEP:
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mnem += FD_OPSIZE(instr) & 0xc;
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mnemlen = 3;
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break;
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case FDI_C_EX:
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mnem += FD_OPSIZE(instr) & 0xc;
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mnemlen = FD_OPSIZE(instr) < 4 ? 3 : 4;
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break;
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case FDI_CMPXCHGD:
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switch (FD_OPSIZE(instr)) {
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default: break;
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case 4: sizesuffix[0] = '8', sizesuffix[1] = 'b', sizesuffixlen = 2; break;
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case 8: sizesuffix[0] = '1', sizesuffix[1] = '6', sizesuffix[2] = 'b', sizesuffixlen = 3; break;
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}
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break;
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case FDI_JCXZ:
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mnemlen = FD_ADDRSIZE(instr) < 4 ? 4 : 5;
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mnem += 5 * (FD_ADDRSIZE(instr) >> 2);
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break;
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case FDI_PUSH:
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if (FD_OP_SIZE(instr, 0) == 2 && FD_OP_TYPE(instr, 0) == FD_OT_IMM)
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sizesuffix[0] = 'w', sizesuffixlen = 1;
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// FALLTHROUGH
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case FDI_POP:
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if (FD_OP_SIZE(instr, 0) == 2 && FD_OP_TYPE(instr, 0) == FD_OT_REG &&
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FD_OP_REG_TYPE(instr, 0) == FD_RT_SEG)
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sizesuffix[0] = 'w', sizesuffixlen = 1;
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break;
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case FDI_XCHG:
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if (FD_OP_TYPE(instr, 0) == FD_OT_MEM)
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prefix_xacq_xrel = true;
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break;
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case FDI_MOV:
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// MOV C6h/C7h can have XRELEASE prefix.
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if (FD_HAS_REP(instr) && FD_OP_TYPE(instr, 0) == FD_OT_MEM &&
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FD_OP_TYPE(instr, 1) == FD_OT_IMM)
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prefix_xacq_xrel = true;
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break;
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case FDI_FXSAVE:
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case FDI_FXRSTOR:
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case FDI_XSAVE:
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case FDI_XSAVEC:
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case FDI_XSAVEOPT:
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case FDI_XSAVES:
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case FDI_XRSTOR:
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case FDI_XRSTORS:
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if (FD_OPSIZE(instr) == 8)
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sizesuffix[0] = '6', sizesuffix[1] = '4', sizesuffixlen = 2;
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break;
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case FDI_RET:
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case FDI_ENTER:
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case FDI_LEAVE:
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if (FD_OPSIZE(instr) == 2)
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sizesuffix[0] = 'w', sizesuffixlen = 1;
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break;
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case FDI_LODS:
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case FDI_MOVS:
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case FDI_CMPS:
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case FDI_OUTS:
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prefix_segment = true;
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// FALLTHROUGH
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case FDI_STOS:
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case FDI_SCAS:
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case FDI_INS:
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if (FD_HAS_REP(instr))
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buf = fd_strpcat(buf, fd_stre("rep "));
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if (FD_HAS_REPNZ(instr))
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buf = fd_strpcat(buf, fd_stre("repnz "));
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if (FD_IS64(instr) && FD_ADDRSIZE(instr) == 4)
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buf = fd_strpcat(buf, fd_stre("addr32 "));
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if (!FD_IS64(instr) && FD_ADDRSIZE(instr) == 2)
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buf = fd_strpcat(buf, fd_stre("addr16 "));
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// FALLTHROUGH
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case FDI_PUSHA:
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case FDI_POPA:
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case FDI_PUSHF:
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case FDI_POPF:
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case FDI_RETF:
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case FDI_IRET:
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case FDI_IN:
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case FDI_OUT:
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switch (FD_OPSIZE(instr)) {
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default: break;
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case 1: sizesuffix[0] = 'b'; sizesuffixlen = 1; break;
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case 2: sizesuffix[0] = 'w'; sizesuffixlen = 1; break;
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case 4: sizesuffix[0] = 'd'; sizesuffixlen = 1; break;
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case 8: sizesuffix[0] = 'q'; sizesuffixlen = 1; break;
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}
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break;
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default: break;
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}
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if (UNLIKELY(prefix_xacq_xrel || FD_HAS_LOCK(instr))) {
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if (FD_HAS_REP(instr))
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buf = fd_strpcat(buf, fd_stre("xrelease "));
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if (FD_HAS_REPNZ(instr))
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buf = fd_strpcat(buf, fd_stre("xacquire "));
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}
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if (UNLIKELY(FD_HAS_LOCK(instr)))
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buf = fd_strpcat(buf, fd_stre("lock "));
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if (UNLIKELY(prefix_segment && FD_SEGMENT(instr) != FD_REG_NONE)) {
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*buf++ = "ecsdfg\0"[FD_SEGMENT(instr) & 7];
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*buf++ = 's';
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*buf++ = ' ';
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}
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for (unsigned i = 0; i < 16; i++)
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buf[i] = mnem[i];
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buf += mnemlen;
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for (unsigned i = 0; i < 4; i++)
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buf[i] = sizesuffix[i];
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buf += sizesuffixlen;
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return buf;
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}
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static char*
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fd_format_impl(char buf[DECLARE_RESTRICTED_ARRAY_SIZE(128)], const FdInstr* instr, uint64_t addr) {
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buf = fd_mnemonic(buf, instr);
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for (int i = 0; i < 4; i++)
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{
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FdOpType op_type = FD_OP_TYPE(instr, i);
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if (op_type == FD_OT_NONE)
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break;
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if (i > 0)
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*buf++ = ',';
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*buf++ = ' ';
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unsigned size = FD_OP_SIZE(instr, i);
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if (op_type == FD_OT_REG) {
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unsigned type = FD_OP_REG_TYPE(instr, i);
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unsigned idx = FD_OP_REG(instr, i);
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buf = fd_strpcatreg(buf, type, idx, size);
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} else if (op_type == FD_OT_MEM) {
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unsigned idx_rt = FD_RT_GPL;
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unsigned idx_sz = FD_ADDRSIZE(instr);
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switch (FD_TYPE(instr)) {
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case FDI_CMPXCHGD: size = 2 * FD_OPSIZE(instr); break;
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case FDI_BOUND: size = 2 * size; break;
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case FDI_JMPF:
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case FDI_CALLF:
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case FDI_LDS:
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case FDI_LES:
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case FDI_LFS:
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case FDI_LGS:
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case FDI_LSS:
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size += 2;
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break;
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case FDI_FLD:
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case FDI_FSTP:
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case FDI_FBLD:
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case FDI_FBSTP:
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size = size != 0 ? size : 10;
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break;
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case FDI_VPGATHERQD:
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case FDI_VGATHERQPS:
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idx_rt = FD_RT_VEC;
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idx_sz = FD_OP_SIZE(instr, 0) * 2;
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break;
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case FDI_VPGATHERDQ:
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case FDI_VGATHERDPD:
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idx_rt = FD_RT_VEC;
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idx_sz = FD_OP_SIZE(instr, 0) / 2;
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break;
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case FDI_VPGATHERDD:
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case FDI_VPGATHERQQ:
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case FDI_VGATHERDPS:
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case FDI_VGATHERQPD:
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idx_rt = FD_RT_VEC;
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idx_sz = FD_OP_SIZE(instr, 0);
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break;
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default: break;
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}
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// 0=0h,1=1h,2=2h,4=5h,6=7h,8=bh,10=9h,16=6h,32=ch,64=8h
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unsigned ptrszidx = (size ^ (size >> 2) ^ (size >> 3)) & 0xf;
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const char* ptrsizes =
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"\00 " // 0x0
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"\11byte ptr " // 0x1
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"\11word ptr " // 0x2
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"\00 " // 0x3
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"\00 " // 0x4
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"\12dword ptr " // 0x5
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"\14xmmword ptr " // 0x6
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"\12fword ptr " // 0x7
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"\14zmmword ptr " // 0x8
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"\12tbyte ptr " // 0x9
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"\00 " // 0xa
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"\12qword ptr " // 0xb
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"\14ymmword ptr "; // 0xc
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const char* ptrsize = ptrsizes + 16 * ptrszidx;
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buf = fd_strpcat(buf, (struct FdStr) { ptrsize+1, *ptrsize });
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unsigned seg = FD_SEGMENT(instr);
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if (seg != FD_REG_NONE) {
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*buf++ = "ecsdfg\0"[seg & 7];
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*buf++ = 's';
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*buf++ = ':';
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}
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*buf++ = '[';
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bool has_base = FD_OP_BASE(instr, i) != FD_REG_NONE;
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bool has_idx = FD_OP_INDEX(instr, i) != FD_REG_NONE;
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if (has_base)
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buf = fd_strpcatreg(buf, FD_RT_GPL, FD_OP_BASE(instr, i), FD_ADDRSIZE(instr));
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if (has_idx) {
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if (has_base)
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*buf++ = '+';
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*buf++ = '0' + (1 << FD_OP_SCALE(instr, i));
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*buf++ = '*';
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buf = fd_strpcatreg(buf, idx_rt, FD_OP_INDEX(instr, i), idx_sz);
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}
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uint64_t disp = FD_OP_DISP(instr, i);
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if (disp && (has_base || has_idx)) {
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*buf++ = (int64_t) disp < 0 ? '-' : '+';
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if ((int64_t) disp < 0)
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disp = -disp;
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}
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if (FD_ADDRSIZE(instr) == 2)
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disp &= 0xffff;
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else if (FD_ADDRSIZE(instr) == 4)
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disp &= 0xffffffff;
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if (disp || (!has_base && !has_idx))
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buf = fd_strpcatnum(buf, disp);
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*buf++ = ']';
|
|
} else if (op_type == FD_OT_IMM || op_type == FD_OT_OFF) {
|
|
size_t immediate = FD_OP_IMM(instr, i);
|
|
// Some instructions have actually two immediate operands which are
|
|
// decoded as a single operand. Split them here appropriately.
|
|
size_t splitimm = 0;
|
|
const char* splitsep = ", ";
|
|
switch (FD_TYPE(instr)) {
|
|
default:
|
|
goto nosplitimm;
|
|
case FDI_SSE_EXTRQ:
|
|
case FDI_SSE_INSERTQ:
|
|
splitimm = immediate & 0xff;
|
|
immediate = (immediate >> 8) & 0xff;
|
|
break;
|
|
case FDI_ENTER:
|
|
splitimm = immediate & 0xffff;
|
|
immediate = (immediate >> 16) & 0xff;
|
|
break;
|
|
case FDI_JMPF:
|
|
case FDI_CALLF:
|
|
splitsep = ":";
|
|
splitimm = (immediate >> 8*size) & 0xffff;
|
|
// immediate is masked below.
|
|
break;
|
|
}
|
|
buf = fd_strpcatnum(buf, splitimm);
|
|
buf = fd_strplcpy(buf, splitsep, 4);
|
|
|
|
nosplitimm:
|
|
if (op_type == FD_OT_OFF)
|
|
immediate += addr + FD_SIZE(instr);
|
|
if (size == 1)
|
|
immediate &= 0xff;
|
|
else if (size == 2)
|
|
immediate &= 0xffff;
|
|
else if (size == 4)
|
|
immediate &= 0xffffffff;
|
|
buf = fd_strpcatnum(buf, immediate);
|
|
}
|
|
}
|
|
*buf++ = '\0';
|
|
return buf;
|
|
}
|
|
|
|
void
|
|
fd_format(const FdInstr* instr, char* buffer, size_t len)
|
|
{
|
|
fd_format_abs(instr, 0, buffer, len);
|
|
}
|
|
|
|
void
|
|
fd_format_abs(const FdInstr* instr, uint64_t addr, char* restrict buffer, size_t len) {
|
|
char tmp[128];
|
|
char* buf = buffer;
|
|
if (UNLIKELY(len < 128)) {
|
|
if (!len)
|
|
return;
|
|
buf = tmp;
|
|
}
|
|
|
|
char* end = fd_format_impl(buf, instr, addr);
|
|
|
|
if (buf != buffer) {
|
|
unsigned i;
|
|
for (i = 0; i < (end - tmp) && i < len-1; i++)
|
|
buffer[i] = tmp[i];
|
|
buffer[i] = '\0';
|
|
}
|
|
}
|