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target/arm: Abstract out pbit/wbit tests in ARM ldr/str decode

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In the ARM ldr/str decode path, rather than directly testing
"insn & (1 << 21)" and "insn & (1 << 24)", abstract these
bits out into wbit and pbit local flags. (We will want to
do more tests against them to determine whether we need to
provide syndrome information.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
This commit is contained in:
Peter Maydell 2017-02-07 18:29:59 +00:00
parent 4061200059
commit 63f26fcfda
1 changed files with 6 additions and 3 deletions
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9
target/arm/translate.c
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@ -8782,6 +8782,8 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
} else { } else {
int address_offset; int address_offset;
bool load = insn & (1 << 20); bool load = insn & (1 << 20);
bool wbit = insn & (1 << 21);
bool pbit = insn & (1 << 24);
bool doubleword = false; bool doubleword = false;
/* Misc load/store */ /* Misc load/store */
rn = (insn >> 16) & 0xf; rn = (insn >> 16) & 0xf;
@ -8799,8 +8801,9 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
} }
addr = load_reg(s, rn); addr = load_reg(s, rn);
if (insn & (1 << 24)) if (pbit) {
gen_add_datah_offset(s, insn, 0, addr); gen_add_datah_offset(s, insn, 0, addr);
}
address_offset = 0; address_offset = 0;
if (doubleword) { if (doubleword) {
@ -8849,10 +8852,10 @@ static void disas_arm_insn(DisasContext *s, unsigned int insn)
ensure correct behavior with overlapping index registers. ensure correct behavior with overlapping index registers.
ldrd with base writeback is undefined if the ldrd with base writeback is undefined if the
destination and index registers overlap. */ destination and index registers overlap. */
if (!(insn & (1 << 24))) { if (!pbit) {
gen_add_datah_offset(s, insn, address_offset, addr); gen_add_datah_offset(s, insn, address_offset, addr);
store_reg(s, rn, addr); store_reg(s, rn, addr);
} else if (insn & (1 << 21)) { } else if (wbit) {
if (address_offset) if (address_offset)
tcg_gen_addi_i32(addr, addr, address_offset); tcg_gen_addi_i32(addr, addr, address_offset);
store_reg(s, rn, addr); store_reg(s, rn, addr);