From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Cc: Richard Henderson <rth@twiddle.net>
Subject: [Qemu-devel] [PULL 21/28] target-i386: Use gen_lea_v_seg in pusha/popa
Date: Mon, 8 Feb 2016 18:03:12 +0100 [thread overview]
Message-ID: <1454950999-64128-22-git-send-email-pbonzini@redhat.com> (raw)
In-Reply-To: <1454950999-64128-1-git-send-email-pbonzini@redhat.com>
From: Richard Henderson <rth@twiddle.net>
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>
---
target-i386/translate.c | 50 +++++++++++++++++++++++--------------------------
1 file changed, 23 insertions(+), 27 deletions(-)
diff --git a/target-i386/translate.c b/target-i386/translate.c
index 2a6a90a..78168aa 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)
--
1.8.3.1
next prev parent reply other threads:[~2016-02-08 17:03 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-08 17:02 [Qemu-devel] [PULL 00/28] Misc changes for 2016-02-08 Paolo Bonzini
2016-02-08 17:02 ` [Qemu-devel] [PULL 01/28] memory: add early bail out from cpu_physical_memory_set_dirty_range Paolo Bonzini
2016-02-08 17:02 ` [Qemu-devel] [PULL 02/28] memory: RCU ram_list.dirty_memory[] for safe RAM hotplug Paolo Bonzini
2016-02-08 17:02 ` [Qemu-devel] [PULL 03/28] qemu-char: Keep pty slave file descriptor open until the master is closed Paolo Bonzini
2016-02-08 17:02 ` [Qemu-devel] [PULL 04/28] configure: sanity check the glib library that pkg-config finds Paolo Bonzini
2016-02-08 17:02 ` [Qemu-devel] [PULL 05/28] include/qemu/atomic.h: default to __atomic functions Paolo Bonzini
2016-02-08 17:02 ` [Qemu-devel] [PULL 06/28] scsi: push WWN fields up to SCSIDevice Paolo Bonzini
2016-02-08 17:02 ` [Qemu-devel] [PULL 07/28] scsi-generic: grab device and port SAS addresses from backend Paolo Bonzini
2016-02-08 17:02 ` [Qemu-devel] [PULL 08/28] hw: Add support for LSI SAS1068 (mptsas) device Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 09/28] qemu-nbd: Fix unintended texi verbatim formatting Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 10/28] qemu-nbd: Minor texi updates Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 11/28] qemu-nbd: Fix texi sentence capitalisation Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 12/28] scripts/kvm/kvm_stat: Fix tracefs access checking Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 13/28] nbd: avoid unaligned uint64_t store Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 14/28] kvm-all: trace: strerror fixup Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 15/28] char: fix repeated registration of tcp chardev I/O handlers Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 16/28] target-i386: Create gen_lea_v_seg Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 17/28] target-i386: Introduce mo_stacksize Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 18/28] target-i386: Use gen_lea_v_seg in gen_lea_modrm Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 19/28] target-i386: Use gen_lea_v_seg in stack subroutines Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 20/28] target-i386: Access segs via TCG registers Paolo Bonzini
2016-02-08 17:03 ` Paolo Bonzini [this message]
2016-02-08 17:03 ` [Qemu-devel] [PULL 22/28] target-i386: Rewrite gen_enter inline Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 23/28] target-i386: Rewrite leave Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 24/28] target-i386: Tidy gen_add_A0_im Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 25/28] target-i386: Deconstruct the cpu_T array Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 26/28] ipmi: do not take/drop iothread lock Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 27/28] ipmi_bmc_sim: Fix off by one in check Paolo Bonzini
2016-02-08 17:03 ` [Qemu-devel] [PULL 28/28] ipmi_bmc_sim: Add break to correct watchdog NMI check Paolo Bonzini
2016-02-09 9:21 ` [Qemu-devel] [PULL 00/28] Misc changes for 2016-02-08 Peter Maydell
2016-02-09 11:10 ` Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1454950999-64128-22-git-send-email-pbonzini@redhat.com \
--to=pbonzini@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=rth@twiddle.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).