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author | Richard Henderson <rth@twiddle.net> | 2015-12-17 11:19:22 -0800 |
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committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-02-09 15:46:54 +0100 |
commit | d37ea0c04723f3e15fde55fe97cff6278159929b (patch) | |
tree | c759fc4a10ff92a3a590b260b5fdca1960392434 | |
parent | 3558f8055f37a34762b7a2a0f02687e6eeab893d (diff) | |
download | qemu-d37ea0c04723f3e15fde55fe97cff6278159929b.zip qemu-d37ea0c04723f3e15fde55fe97cff6278159929b.tar.gz qemu-d37ea0c04723f3e15fde55fe97cff6278159929b.tar.bz2 |
target-i386: Use gen_lea_v_seg in pusha/popa
More centralization of handling of segment bases.
Also fixes the note about 16-bit wrap around not fully handled.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1450379966-28198-7-git-send-email-rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r-- | target-i386/translate.c | 50 |
1 files changed, 23 insertions, 27 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index 038eef2..8900a0c 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -2298,45 +2298,41 @@ static inline void gen_stack_A0(DisasContext *s) gen_lea_v_seg(s, s->ss32 ? MO_32 : MO_16, cpu_regs[R_ESP], R_SS, -1); } -/* NOTE: wrap around in 16 bit not fully handled */ static void gen_pusha(DisasContext *s) { + TCGMemOp s_ot = s->ss32 ? MO_32 : MO_16; + TCGMemOp d_ot = s->dflag; + int size = 1 << d_ot; int i; - gen_op_movl_A0_reg(R_ESP); - gen_op_addl_A0_im(-(8 << s->dflag)); - if (!s->ss32) - tcg_gen_ext16u_tl(cpu_A0, cpu_A0); - tcg_gen_mov_tl(cpu_T[1], cpu_A0); - if (s->addseg) - gen_op_addl_A0_seg(s, R_SS); - for(i = 0;i < 8; i++) { - gen_op_mov_v_reg(MO_32, cpu_T[0], 7 - i); - gen_op_st_v(s, s->dflag, cpu_T[0], cpu_A0); - gen_op_addl_A0_im(1 << s->dflag); + + for (i = 0; i < 8; i++) { + tcg_gen_addi_tl(cpu_A0, cpu_regs[R_ESP], (i - 8) * size); + gen_lea_v_seg(s, s_ot, cpu_A0, R_SS, -1); + gen_op_st_v(s, d_ot, cpu_regs[7 - i], cpu_A0); } - gen_op_mov_reg_v(MO_16 + s->ss32, R_ESP, cpu_T[1]); + + gen_stack_update(s, -8 * size); } -/* NOTE: wrap around in 16 bit not fully handled */ static void gen_popa(DisasContext *s) { + TCGMemOp s_ot = s->ss32 ? MO_32 : MO_16; + TCGMemOp d_ot = s->dflag; + int size = 1 << d_ot; int i; - gen_op_movl_A0_reg(R_ESP); - if (!s->ss32) - tcg_gen_ext16u_tl(cpu_A0, cpu_A0); - tcg_gen_mov_tl(cpu_T[1], cpu_A0); - tcg_gen_addi_tl(cpu_T[1], cpu_T[1], 8 << s->dflag); - if (s->addseg) - gen_op_addl_A0_seg(s, R_SS); - for(i = 0;i < 8; i++) { + + for (i = 0; i < 8; i++) { /* ESP is not reloaded */ - if (i != 3) { - gen_op_ld_v(s, s->dflag, cpu_T[0], cpu_A0); - gen_op_mov_reg_v(s->dflag, 7 - i, cpu_T[0]); + if (7 - i == R_ESP) { + continue; } - gen_op_addl_A0_im(1 << s->dflag); + tcg_gen_addi_tl(cpu_A0, cpu_regs[R_ESP], i * size); + gen_lea_v_seg(s, s_ot, cpu_A0, R_SS, -1); + gen_op_ld_v(s, d_ot, cpu_T[0], cpu_A0); + gen_op_mov_reg_v(d_ot, 7 - i, cpu_T[0]); } - gen_op_mov_reg_v(MO_16 + s->ss32, R_ESP, cpu_T[1]); + + gen_stack_update(s, 8 * size); } static void gen_enter(DisasContext *s, int esp_addend, int level) |