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author | Richard Henderson | 2016-11-03 21:50:02 +0100 |
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committer | Laurent Vivier | 2016-12-27 18:16:42 +0100 |
commit | f84aab269ddab8509b77408b886e9071bf5c48fb (patch) | |
tree | 49dbfb7362a883b0847bf812d1c541e5f14d6cf7 /target | |
parent | target-m68k: Delay autoinc writeback (diff) | |
download | qemu-f84aab269ddab8509b77408b886e9071bf5c48fb.tar.gz qemu-f84aab269ddab8509b77408b886e9071bf5c48fb.tar.xz qemu-f84aab269ddab8509b77408b886e9071bf5c48fb.zip |
target-m68k: Split gen_lea and gen_ea
Provide gen_lea_mode and gen_ea_mode, where the mode can be
specified manually, rather than taken from the instruction.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1478206203-4606-3-git-send-email-rth@twiddle.net>
Diffstat (limited to 'target')
-rw-r--r-- | target/m68k/translate.c | 112 |
1 files changed, 59 insertions, 53 deletions
diff --git a/target/m68k/translate.c b/target/m68k/translate.c index a9066dc09f..aaa221ee50 100644 --- a/target/m68k/translate.c +++ b/target/m68k/translate.c @@ -697,37 +697,37 @@ static void gen_partset_reg(int opsize, TCGv reg, TCGv val) /* Generate code for an "effective address". Does not adjust the base register for autoincrement addressing modes. */ -static TCGv gen_lea(CPUM68KState *env, DisasContext *s, uint16_t insn, - int opsize) +static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s, + int mode, int reg0, int opsize) { TCGv reg; TCGv tmp; uint16_t ext; uint32_t offset; - switch ((insn >> 3) & 7) { + switch (mode) { case 0: /* Data register direct. */ case 1: /* Address register direct. */ return NULL_QREG; case 2: /* Indirect register */ case 3: /* Indirect postincrement. */ - return AREG(insn, 0); + return get_areg(s, reg0); case 4: /* Indirect predecrememnt. */ - reg = AREG(insn, 0); + reg = get_areg(s, reg0); tmp = tcg_temp_new(); tcg_gen_subi_i32(tmp, reg, opsize_bytes(opsize)); return tmp; case 5: /* Indirect displacement. */ - reg = AREG(insn, 0); + reg = get_areg(s, reg0); tmp = tcg_temp_new(); ext = read_im16(env, s); tcg_gen_addi_i32(tmp, reg, (int16_t)ext); return tmp; case 6: /* Indirect index + displacement. */ - reg = AREG(insn, 0); + reg = get_areg(s, reg0); return gen_lea_indexed(env, s, reg); case 7: /* Other */ - switch (insn & 7) { + switch (reg0) { case 0: /* Absolute short. */ offset = (int16_t)read_im16(env, s); return tcg_const_i32(offset); @@ -749,39 +749,26 @@ static TCGv gen_lea(CPUM68KState *env, DisasContext *s, uint16_t insn, return NULL_QREG; } -/* Helper function for gen_ea. Reuse the computed address between the - for read/write operands. */ -static inline TCGv gen_ea_once(CPUM68KState *env, DisasContext *s, - uint16_t insn, int opsize, TCGv val, - TCGv *addrp, ea_what what) +static TCGv gen_lea(CPUM68KState *env, DisasContext *s, uint16_t insn, + int opsize) { - TCGv tmp; - - if (addrp && what == EA_STORE) { - tmp = *addrp; - } else { - tmp = gen_lea(env, s, insn, opsize); - if (IS_NULL_QREG(tmp)) - return tmp; - if (addrp) - *addrp = tmp; - } - return gen_ldst(s, opsize, tmp, val, what); + int mode = extract32(insn, 3, 3); + int reg0 = REG(insn, 0); + return gen_lea_mode(env, s, mode, reg0, opsize); } -/* Generate code to load/store a value from/into an EA. If VAL > 0 this is +/* Generate code to load/store a value from/into an EA. If WHAT > 0 this is a write otherwise it is a read (0 == sign extend, -1 == zero extend). ADDRP is non-null for readwrite operands. */ -static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn, - int opsize, TCGv val, TCGv *addrp, ea_what what) +static TCGv gen_ea_mode(CPUM68KState *env, DisasContext *s, int mode, int reg0, + int opsize, TCGv val, TCGv *addrp, ea_what what) { - TCGv reg; - TCGv result; - uint32_t offset; + TCGv reg, tmp, result; + int32_t offset; - switch ((insn >> 3) & 7) { + switch (mode) { case 0: /* Data register direct. */ - reg = DREG(insn, 0); + reg = cpu_dregs[reg0]; if (what == EA_STORE) { gen_partset_reg(opsize, reg, val); return store_dummy; @@ -789,7 +776,7 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn, return gen_extend(reg, opsize, what == EA_LOADS); } case 1: /* Address register direct. */ - reg = AREG(insn, 0); + reg = get_areg(s, reg0); if (what == EA_STORE) { tcg_gen_mov_i32(reg, val); return store_dummy; @@ -797,45 +784,56 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn, return gen_extend(reg, opsize, what == EA_LOADS); } case 2: /* Indirect register */ - reg = AREG(insn, 0); + reg = get_areg(s, reg0); return gen_ldst(s, opsize, reg, val, what); case 3: /* Indirect postincrement. */ - reg = AREG(insn, 0); + reg = get_areg(s, reg0); result = gen_ldst(s, opsize, reg, val, what); if (what == EA_STORE || !addrp) { TCGv tmp = tcg_temp_new(); tcg_gen_addi_i32(tmp, reg, opsize_bytes(opsize)); - delay_set_areg(s, REG(insn, 0), tmp, true); + delay_set_areg(s, reg0, tmp, true); } return result; case 4: /* Indirect predecrememnt. */ - { - TCGv tmp; - if (addrp && what == EA_STORE) { - tmp = *addrp; - } else { - tmp = gen_lea(env, s, insn, opsize); - if (IS_NULL_QREG(tmp)) - return tmp; - if (addrp) - *addrp = tmp; + if (addrp && what == EA_STORE) { + tmp = *addrp; + } else { + tmp = gen_lea_mode(env, s, mode, reg0, opsize); + if (IS_NULL_QREG(tmp)) { + return tmp; } - result = gen_ldst(s, opsize, tmp, val, what); - if (what == EA_STORE || !addrp) { - delay_set_areg(s, REG(insn, 0), tmp, false); + if (addrp) { + *addrp = tmp; } } + result = gen_ldst(s, opsize, tmp, val, what); + if (what == EA_STORE || !addrp) { + delay_set_areg(s, reg0, tmp, false); + } return result; case 5: /* Indirect displacement. */ case 6: /* Indirect index + displacement. */ - return gen_ea_once(env, s, insn, opsize, val, addrp, what); + do_indirect: + if (addrp && what == EA_STORE) { + tmp = *addrp; + } else { + tmp = gen_lea_mode(env, s, mode, reg0, opsize); + if (IS_NULL_QREG(tmp)) { + return tmp; + } + if (addrp) { + *addrp = tmp; + } + } + return gen_ldst(s, opsize, tmp, val, what); case 7: /* Other */ - switch (insn & 7) { + switch (reg0) { case 0: /* Absolute short. */ case 1: /* Absolute long. */ case 2: /* pc displacement */ case 3: /* pc index+displacement. */ - return gen_ea_once(env, s, insn, opsize, val, addrp, what); + goto do_indirect; case 4: /* Immediate. */ /* Sign extend values for consistency. */ switch (opsize) { @@ -868,6 +866,14 @@ static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn, return NULL_QREG; } +static TCGv gen_ea(CPUM68KState *env, DisasContext *s, uint16_t insn, + int opsize, TCGv val, TCGv *addrp, ea_what what) +{ + int mode = extract32(insn, 3, 3); + int reg0 = REG(insn, 0); + return gen_ea_mode(env, s, mode, reg0, opsize, val, addrp, what); +} + typedef struct { TCGCond tcond; bool g1; |