fadec-enc.h

#ifndef FD_FADEC_ENC_H_
#define FD_FADEC_ENC_H_

#include <stddef.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
  // clang-format off
  FE_AX = 0x100, FE_CX, FE_DX, FE_BX, FE_SP, FE_BP, FE_SI, FE_DI,
  FE_R8, FE_R9, FE_R10, FE_R11, FE_R12, FE_R13, FE_R14, FE_R15,
  FE_IP = 0x120,
  FE_AH = 0x204, FE_CH, FE_DH, FE_BH,
  FE_ES = 0x300, FE_CS, FE_SS, FE_DS, FE_FS, FE_GS,
  FE_ST0 = 0x400, FE_ST1, FE_ST2, FE_ST3, FE_ST4, FE_ST5, FE_ST6, FE_ST7,
  FE_MM0 = 0x500, FE_MM1, FE_MM2, FE_MM3, FE_MM4, FE_MM5, FE_MM6, FE_MM7,
  FE_XMM0 = 0x600, FE_XMM1, FE_XMM2, FE_XMM3, FE_XMM4, FE_XMM5, FE_XMM6, FE_XMM7,
  FE_XMM8, FE_XMM9, FE_XMM10, FE_XMM11, FE_XMM12, FE_XMM13, FE_XMM14, FE_XMM15,
  FE_XMM16, FE_XMM17, FE_XMM18, FE_XMM19, FE_XMM20, FE_XMM21, FE_XMM22, FE_XMM23,
  FE_XMM24, FE_XMM25, FE_XMM26, FE_XMM27, FE_XMM28, FE_XMM29, FE_XMM30, FE_XMM31,
  FE_K0 = 0x700, FE_K1, FE_K2, FE_K3, FE_K4, FE_K5, FE_K6, FE_K7,
  FE_TMM0 = 0x800, FE_TMM1, FE_TMM2, FE_TMM3, FE_TMM4, FE_TMM5, FE_TMM6, FE_TMM7,
  // clang-format on
} FeReg;

typedef int64_t FeOp;

/** Construct a memory operand. Unused parts can be set to 0 and will be
 * ignored. FE_IP can be used as base register, in which case the offset is
 * interpreted as the offset from the /current/ position -- the size of the
 * encoded instruction will be subtracted during encoding. scale must be 1, 2,
 * 4, or 8; but is ignored if  idx == 0. **/
#define FE_MEM(base, sc, idx, off)                                             \
  (INT64_MIN | ((int64_t)((base) & 0xfff) << 32) |                             \
   ((int64_t)((idx) & 0xfff) << 44) | ((int64_t)((sc) & 0xf) << 56) |          \
   ((off) & 0xffffffff))
#define FE_NOREG ((FeReg)0)

/** Add segment override prefix. This may or may not generate prefixes for the
 * ignored prefixes ES/CS/DS/SS in 64-bit mode. **/
#define FE_SEG(seg) ((uint64_t)(((seg) & 0x7) + 1) << 29)
/** Do not use. **/
#define FE_SEG_MASK 0xe0000000
/** Overrides address size. **/
#define FE_ADDR32 0x10000000
/** Used together with a RIP-relative (conditional) jump, this will force the
 * use of the encoding with the largest distance. Useful for reserving a jump
 * when the target offset is still unknown; if the jump is re-encoded later on,
 * FE_JMPL must be specified there, too, so that the encoding lengths match. **/
#define FE_JMPL 0x100000000
#define FE_MASK(kreg) ((uint64_t)((kreg) & 0x7) << 33)
#define FE_RC_RN 0x0000000
#define FE_RC_RD 0x0800000
#define FE_RC_RU 0x1000000
#define FE_RC_RZ 0x1800000

enum {
  FE_CC_O = 0x0,
  FE_CC_NO = 0x1,
  FE_CC_C = 0x2,
  FE_CC_B = FE_CC_C,
  FE_CC_NAE = FE_CC_C,
  FE_CC_NC = 0x3,
  FE_CC_AE = FE_CC_NC,
  FE_CC_NB = FE_CC_NC,
  FE_CC_Z = 0x4,
  FE_CC_E = FE_CC_Z,
  FE_CC_NZ = 0x5,
  FE_CC_NE = FE_CC_NZ,
  FE_CC_BE = 0x6,
  FE_CC_NA = FE_CC_BE,
  FE_CC_A = 0x7,
  FE_CC_NBE = FE_CC_A,
  FE_CC_S = 0x8,
  FE_CC_NS = 0x9,
  FE_CC_P = 0xa,
  FE_CC_PE = FE_CC_P,
  FE_CC_NP = 0xb,
  FE_CC_PO = FE_CC_NP,
  FE_CC_L = 0xc,
  FE_CC_NGE = FE_CC_L,
  FE_CC_GE = 0xd,
  FE_CC_NL = FE_CC_GE,
  FE_CC_LE = 0xe,
  FE_CC_NG = FE_CC_LE,
  FE_CC_G = 0xf,
  FE_CC_NLE = FE_CC_G,
};

#include <fadec-encode-public.inc>

/** Do not use. **/
#define fe_enc64_1(buf, mnem, op0, op1, op2, op3, ...)                         \
  fe_enc64_impl(buf, mnem, op0, op1, op2, op3)
/** Encode a single instruction for 64-bit mode.
 * \param buf Pointer to the buffer for instruction bytes, must have a size of
 *        15 bytes. The pointer is advanced by the number of bytes used for
 *        encoding the specified instruction.
 * \param mnem Mnemonic, optionally or-ed with FE_SEG(), FE_ADDR32, or FE_JMPL.
 * \param operands... Instruction operands. Immediate operands are passed as
 *        plain value; register operands using the FeReg enum; memory operands
 *        using FE_MEM(); and offset operands for RIP-relative jumps/calls are
 *        specified as _address in buf_, e.g. (intptr_t) jmptgt, the address of
 *        buf and the size of the encoded instruction are subtracted internally.
 * \return Zero for success or a negative value in case of an error.
 **/
#define fe_enc64(buf, ...) fe_enc64_1(buf, __VA_ARGS__, 0, 0, 0, 0, 0)
/** Do not use. **/
int fe_enc64_impl(uint8_t** buf, uint64_t mnem, FeOp op0, FeOp op1, FeOp op2,
                  FeOp op3);

#ifdef __cplusplus
}
#endif

#endif