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Diffstat (limited to 'target/i386/hvf/x86_flags.c')
-rw-r--r--target/i386/hvf/x86_flags.c235
1 files changed, 113 insertions, 122 deletions
diff --git a/target/i386/hvf/x86_flags.c b/target/i386/hvf/x86_flags.c
index ea25a3b26f..b0686c7962 100644
--- a/target/i386/hvf/x86_flags.c
+++ b/target/i386/hvf/x86_flags.c
@@ -28,6 +28,91 @@
#include "x86_flags.h"
#include "x86.h"
+
+/* this is basically bocsh code */
+
+#define LF_SIGN_BIT 31
+
+#define LF_BIT_SD (0) /* lazy Sign Flag Delta */
+#define LF_BIT_AF (3) /* lazy Adjust flag */
+#define LF_BIT_PDB (8) /* lazy Parity Delta Byte (8 bits) */
+#define LF_BIT_CF (31) /* lazy Carry Flag */
+#define LF_BIT_PO (30) /* lazy Partial Overflow = CF ^ OF */
+
+#define LF_MASK_SD (0x01 << LF_BIT_SD)
+#define LF_MASK_AF (0x01 << LF_BIT_AF)
+#define LF_MASK_PDB (0xFF << LF_BIT_PDB)
+#define LF_MASK_CF (0x01 << LF_BIT_CF)
+#define LF_MASK_PO (0x01 << LF_BIT_PO)
+
+#define ADD_COUT_VEC(op1, op2, result) \
+ (((op1) & (op2)) | (((op1) | (op2)) & (~(result))))
+
+#define SUB_COUT_VEC(op1, op2, result) \
+ (((~(op1)) & (op2)) | (((~(op1)) ^ (op2)) & (result)))
+
+#define GET_ADD_OVERFLOW(op1, op2, result, mask) \
+ ((((op1) ^ (result)) & ((op2) ^ (result))) & (mask))
+
+/* ******************* */
+/* OSZAPC */
+/* ******************* */
+
+/* size, carries, result */
+#define SET_FLAGS_OSZAPC_SIZE(size, lf_carries, lf_result) { \
+ addr_t temp = ((lf_carries) & (LF_MASK_AF)) | \
+ (((lf_carries) >> (size - 2)) << LF_BIT_PO); \
+ env->hvf_emul->lflags.result = (addr_t)(int##size##_t)(lf_result); \
+ if ((size) == 32) { \
+ temp = ((lf_carries) & ~(LF_MASK_PDB | LF_MASK_SD)); \
+ } else if ((size) == 16) { \
+ temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 16); \
+ } else if ((size) == 8) { \
+ temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 24); \
+ } else { \
+ VM_PANIC("unimplemented"); \
+ } \
+ env->hvf_emul->lflags.auxbits = (addr_t)(uint32_t)temp; \
+}
+
+/* carries, result */
+#define SET_FLAGS_OSZAPC_8(carries, result) \
+ SET_FLAGS_OSZAPC_SIZE(8, carries, result)
+#define SET_FLAGS_OSZAPC_16(carries, result) \
+ SET_FLAGS_OSZAPC_SIZE(16, carries, result)
+#define SET_FLAGS_OSZAPC_32(carries, result) \
+ SET_FLAGS_OSZAPC_SIZE(32, carries, result)
+
+/* ******************* */
+/* OSZAP */
+/* ******************* */
+/* size, carries, result */
+#define SET_FLAGS_OSZAP_SIZE(size, lf_carries, lf_result) { \
+ addr_t temp = ((lf_carries) & (LF_MASK_AF)) | \
+ (((lf_carries) >> (size - 2)) << LF_BIT_PO); \
+ if ((size) == 32) { \
+ temp = ((lf_carries) & ~(LF_MASK_PDB | LF_MASK_SD)); \
+ } else if ((size) == 16) { \
+ temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 16); \
+ } else if ((size) == 8) { \
+ temp = ((lf_carries) & (LF_MASK_AF)) | ((lf_carries) << 24); \
+ } else { \
+ VM_PANIC("unimplemented"); \
+ } \
+ env->hvf_emul->lflags.result = (addr_t)(int##size##_t)(lf_result); \
+ addr_t delta_c = (env->hvf_emul->lflags.auxbits ^ temp) & LF_MASK_CF; \
+ delta_c ^= (delta_c >> 1); \
+ env->hvf_emul->lflags.auxbits = (addr_t)(uint32_t)(temp ^ delta_c); \
+}
+
+/* carries, result */
+#define SET_FLAGS_OSZAP_8(carries, result) \
+ SET_FLAGS_OSZAP_SIZE(8, carries, result)
+#define SET_FLAGS_OSZAP_16(carries, result) \
+ SET_FLAGS_OSZAP_SIZE(16, carries, result)
+#define SET_FLAGS_OSZAP_32(carries, result) \
+ SET_FLAGS_OSZAP_SIZE(32, carries, result)
+
void SET_FLAGS_OxxxxC(CPUX86State *env, uint32_t new_of, uint32_t new_cf)
{
uint32_t temp_po = new_of ^ new_cf;
@@ -39,178 +124,92 @@ void SET_FLAGS_OxxxxC(CPUX86State *env, uint32_t new_of, uint32_t new_cf)
void SET_FLAGS_OSZAPC_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
uint32_t diff)
{
- SET_FLAGS_OSZAPC_SUB_32(v1, v2, diff);
+ SET_FLAGS_OSZAPC_32(SUB_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAPC_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
uint16_t diff)
{
- SET_FLAGS_OSZAPC_SUB_16(v1, v2, diff);
+ SET_FLAGS_OSZAPC_16(SUB_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAPC_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
uint8_t diff)
{
- SET_FLAGS_OSZAPC_SUB_8(v1, v2, diff);
+ SET_FLAGS_OSZAPC_8(SUB_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAPC_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
uint32_t diff)
{
- SET_FLAGS_OSZAPC_ADD_32(v1, v2, diff);
+ SET_FLAGS_OSZAPC_32(ADD_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAPC_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
uint16_t diff)
{
- SET_FLAGS_OSZAPC_ADD_16(v1, v2, diff);
+ SET_FLAGS_OSZAPC_16(ADD_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAPC_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
uint8_t diff)
{
- SET_FLAGS_OSZAPC_ADD_8(v1, v2, diff);
+ SET_FLAGS_OSZAPC_8(ADD_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAP_SUB32(CPUX86State *env, uint32_t v1, uint32_t v2,
uint32_t diff)
{
- SET_FLAGS_OSZAP_SUB_32(v1, v2, diff);
+ SET_FLAGS_OSZAP_32(SUB_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAP_SUB16(CPUX86State *env, uint16_t v1, uint16_t v2,
uint16_t diff)
{
- SET_FLAGS_OSZAP_SUB_16(v1, v2, diff);
+ SET_FLAGS_OSZAP_16(SUB_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAP_SUB8(CPUX86State *env, uint8_t v1, uint8_t v2,
uint8_t diff)
{
- SET_FLAGS_OSZAP_SUB_8(v1, v2, diff);
+ SET_FLAGS_OSZAP_8(SUB_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAP_ADD32(CPUX86State *env, uint32_t v1, uint32_t v2,
uint32_t diff)
{
- SET_FLAGS_OSZAP_ADD_32(v1, v2, diff);
+ SET_FLAGS_OSZAP_32(ADD_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAP_ADD16(CPUX86State *env, uint16_t v1, uint16_t v2,
uint16_t diff)
{
- SET_FLAGS_OSZAP_ADD_16(v1, v2, diff);
+ SET_FLAGS_OSZAP_16(ADD_COUT_VEC(v1, v2, diff), diff);
}
void SET_FLAGS_OSZAP_ADD8(CPUX86State *env, uint8_t v1, uint8_t v2,
uint8_t diff)
{
- SET_FLAGS_OSZAP_ADD_8(v1, v2, diff);
-}
-
-
-void SET_FLAGS_OSZAPC_LOGIC32(CPUX86State *env, uint32_t diff)
-{
- SET_FLAGS_OSZAPC_LOGIC_32(diff);
-}
-
-void SET_FLAGS_OSZAPC_LOGIC16(CPUX86State *env, uint16_t diff)
-{
- SET_FLAGS_OSZAPC_LOGIC_16(diff);
-}
-
-void SET_FLAGS_OSZAPC_LOGIC8(CPUX86State *env, uint8_t diff)
-{
- SET_FLAGS_OSZAPC_LOGIC_8(diff);
-}
-
-void SET_FLAGS_SHR32(CPUX86State *env, uint32_t v, int count, uint32_t res)
-{
- int cf = (v >> (count - 1)) & 0x1;
- int of = (((res << 1) ^ res) >> 31);
-
- SET_FLAGS_OSZAPC_LOGIC_32(res);
- SET_FLAGS_OxxxxC(env, of, cf);
-}
-
-void SET_FLAGS_SHR16(CPUX86State *env, uint16_t v, int count, uint16_t res)
-{
- int cf = (v >> (count - 1)) & 0x1;
- int of = (((res << 1) ^ res) >> 15);
-
- SET_FLAGS_OSZAPC_LOGIC_16(res);
- SET_FLAGS_OxxxxC(env, of, cf);
-}
-
-void SET_FLAGS_SHR8(CPUX86State *env, uint8_t v, int count, uint8_t res)
-{
- int cf = (v >> (count - 1)) & 0x1;
- int of = (((res << 1) ^ res) >> 7);
-
- SET_FLAGS_OSZAPC_LOGIC_8(res);
- SET_FLAGS_OxxxxC(env, of, cf);
-}
-
-void SET_FLAGS_SAR32(CPUX86State *env, int32_t v, int count, uint32_t res)
-{
- int cf = (v >> (count - 1)) & 0x1;
-
- SET_FLAGS_OSZAPC_LOGIC_32(res);
- SET_FLAGS_OxxxxC(env, 0, cf);
+ SET_FLAGS_OSZAP_8(ADD_COUT_VEC(v1, v2, diff), diff);
}
-void SET_FLAGS_SAR16(CPUX86State *env, int16_t v, int count, uint16_t res)
-{
- int cf = (v >> (count - 1)) & 0x1;
-
- SET_FLAGS_OSZAPC_LOGIC_16(res);
- SET_FLAGS_OxxxxC(env, 0, cf);
-}
-void SET_FLAGS_SAR8(CPUX86State *env, int8_t v, int count, uint8_t res)
+void SET_FLAGS_OSZAPC_LOGIC32(CPUX86State *env, uint32_t v1, uint32_t v2,
+ uint32_t diff)
{
- int cf = (v >> (count - 1)) & 0x1;
-
- SET_FLAGS_OSZAPC_LOGIC_8(res);
- SET_FLAGS_OxxxxC(env, 0, cf);
+ SET_FLAGS_OSZAPC_32(0, diff);
}
-
-void SET_FLAGS_SHL32(CPUX86State *env, uint32_t v, int count, uint32_t res)
+void SET_FLAGS_OSZAPC_LOGIC16(CPUX86State *env, uint16_t v1, uint16_t v2,
+ uint16_t diff)
{
- int of, cf;
-
- cf = (v >> (32 - count)) & 0x1;
- of = cf ^ (res >> 31);
-
- SET_FLAGS_OSZAPC_LOGIC_32(res);
- SET_FLAGS_OxxxxC(env, of, cf);
+ SET_FLAGS_OSZAPC_16(0, diff);
}
-void SET_FLAGS_SHL16(CPUX86State *env, uint16_t v, int count, uint16_t res)
+void SET_FLAGS_OSZAPC_LOGIC8(CPUX86State *env, uint8_t v1, uint8_t v2,
+ uint8_t diff)
{
- int of = 0, cf = 0;
-
- if (count <= 16) {
- cf = (v >> (16 - count)) & 0x1;
- of = cf ^ (res >> 15);
- }
-
- SET_FLAGS_OSZAPC_LOGIC_16(res);
- SET_FLAGS_OxxxxC(env, of, cf);
-}
-
-void SET_FLAGS_SHL8(CPUX86State *env, uint8_t v, int count, uint8_t res)
-{
- int of = 0, cf = 0;
-
- if (count <= 8) {
- cf = (v >> (8 - count)) & 0x1;
- of = cf ^ (res >> 7);
- }
-
- SET_FLAGS_OSZAPC_LOGIC_8(res);
- SET_FLAGS_OxxxxC(env, of, cf);
+ SET_FLAGS_OSZAPC_8(0, diff);
}
bool get_PF(CPUX86State *env)
@@ -228,34 +227,26 @@ void set_PF(CPUX86State *env, bool val)
env->hvf_emul->lflags.auxbits |= (temp << LF_BIT_PDB);
}
-bool _get_OF(CPUX86State *env)
-{
- return ((env->hvf_emul->lflags.auxbits + (1U << LF_BIT_PO)) >> LF_BIT_CF) & 1;
-}
-
bool get_OF(CPUX86State *env)
{
- return _get_OF(env);
-}
-
-bool _get_CF(CPUX86State *env)
-{
- return (env->hvf_emul->lflags.auxbits >> LF_BIT_CF) & 1;
+ return ((env->hvf_emul->lflags.auxbits + (1U << LF_BIT_PO)) >> LF_BIT_CF) & 1;
}
bool get_CF(CPUX86State *env)
{
- return _get_CF(env);
+ return (env->hvf_emul->lflags.auxbits >> LF_BIT_CF) & 1;
}
void set_OF(CPUX86State *env, bool val)
{
- SET_FLAGS_OxxxxC(env, val, _get_CF(env));
+ bool old_cf = get_CF(env);
+ SET_FLAGS_OxxxxC(env, val, old_cf);
}
void set_CF(CPUX86State *env, bool val)
{
- SET_FLAGS_OxxxxC(env, _get_OF(env), (val));
+ bool old_of = get_OF(env);
+ SET_FLAGS_OxxxxC(env, old_of, val);
}
bool get_AF(CPUX86State *env)
@@ -266,7 +257,7 @@ bool get_AF(CPUX86State *env)
void set_AF(CPUX86State *env, bool val)
{
env->hvf_emul->lflags.auxbits &= ~(LF_MASK_AF);
- env->hvf_emul->lflags.auxbits |= (val) << LF_BIT_AF;
+ env->hvf_emul->lflags.auxbits |= val << LF_BIT_AF;
}
bool get_ZF(CPUX86State *env)
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2025-04-27 07:23:01 +0200