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target-arm: A64: add support for conditional branches

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This patch adds emulation for the conditional branch (b.cond) instruction.

Signed-off-by: Alexander Graf <agraf@suse.de>
[claudio: adapted to new decoder structure,
          reused arm infrastructure for checking the flags]
Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Alexander Graf 2013-12-17 19:42:33 +00:00 • committed by Peter Maydell
parent b001c8c3d6
commit 39fb730aed
3 changed files with 38 additions and 7 deletions
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14
target-arm/translate.c
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@ -671,7 +671,11 @@ static void gen_thumb2_parallel_addsub(int op1, int op2, TCGv_i32 a, TCGv_i32 b)
}
#undef PAS_OP
static void gen_test_cc(int cc, int label)
/*
* generate a conditional branch based on ARM condition code cc.
* This is common between ARM and Aarch64 targets.
*/
void arm_gen_test_cc(int cc, int label)
{
TCGv_i32 tmp;
int inv;
@ -7131,7 +7135,7 @@ static void disas_arm_insn(CPUARMState * env, DisasContext *s)
/* if not always execute, we generate a conditional jump to
next instruction */
s->condlabel = gen_new_label();
gen_test_cc(cond ^ 1, s->condlabel);
arm_gen_test_cc(cond ^ 1, s->condlabel);
s->condjmp = 1;
}
if ((insn & 0x0f900000) == 0x03000000) {
@ -9148,7 +9152,7 @@ static int disas_thumb2_insn(CPUARMState *env, DisasContext *s, uint16_t insn_hw
op = (insn >> 22) & 0xf;
/* Generate a conditional jump to next instruction. */
s->condlabel = gen_new_label();
gen_test_cc(op ^ 1, s->condlabel);
arm_gen_test_cc(op ^ 1, s->condlabel);
s->condjmp = 1;
/* offset[11:1] = insn[10:0] */
@ -9505,7 +9509,7 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s)
cond = s->condexec_cond;
if (cond != 0x0e) { /* Skip conditional when condition is AL. */
s->condlabel = gen_new_label();
gen_test_cc(cond ^ 1, s->condlabel);
arm_gen_test_cc(cond ^ 1, s->condlabel);
s->condjmp = 1;
}
}
@ -10178,7 +10182,7 @@ static void disas_thumb_insn(CPUARMState *env, DisasContext *s)
}
/* generate a conditional jump to next instruction */
s->condlabel = gen_new_label();
gen_test_cc(cond ^ 1, s->condlabel);
arm_gen_test_cc(cond ^ 1, s->condlabel);
s->condjmp = 1;
/* jump to the offset */