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[Qemu-devel] [RESEND][PATCH 5/13] Introduce next_cflags
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] [RESEND][PATCH 5/13] Introduce next_cflags |
Date: |
Wed, 20 Aug 2008 16:52:53 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
Introduce next_cflags as part of CPUState. It controls the compile flags
of the next newly generated TB. After use, it will automatically be reset
to zero. This allows the caller to simply set and then forget about it,
e.g. to ensure that the next, and only the next TB will contain just a
single instruction. To avoid that next_cflags hits the wrong TB,
interrupt delivery is suppressed when this field is non-zero.
Signed-off-by: Jan Kiszka <address@hidden>
---
cpu-defs.h | 4 ++++
cpu-exec.c | 9 +++++++--
2 files changed, 11 insertions(+), 2 deletions(-)
Index: b/cpu-defs.h
===================================================================
--- a/cpu-defs.h
+++ b/cpu-defs.h
@@ -183,6 +183,10 @@ typedef struct CPUWatchpoint {
} icount_decr; \
uint32_t can_do_io; /* nonzero if memory mapped IO is safe. */ \
\
+ /* Compile flags for generating next regular TB. \
+ Will be automatically zeroed after use. */ \
+ uint16_t next_cflags; \
+ \
/* from this point: preserved by CPU reset */ \
/* ice debug support */ \
CPUBreakpoint *breakpoints; \
Index: b/cpu-exec.c
===================================================================
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -150,7 +150,8 @@ static TranslationBlock *tb_find_slow(ta
}
not_found:
/* if no translated code available, then translate it now */
- tb = tb_gen_code(env, pc, cs_base, flags, 0);
+ tb = tb_gen_code(env, pc, cs_base, flags, env->next_cflags);
+ env->next_cflags = 0;
found:
/* we add the TB in the virtual pc hash table */
@@ -361,8 +362,12 @@ int cpu_exec(CPUState *env1)
next_tb = 0; /* force lookup of first TB */
for(;;) {
interrupt_request = env->interrupt_request;
+ /* Deliver interrupt, but only if we are not recompiling some
+ TB (non-zero next_cflags) and the current single-step mode
+ doesn't block IRQs. */
if (unlikely(interrupt_request) &&
- likely(!(env->singlestep_enabled & SSTEP_NOIRQ))) {
+ likely(env->next_cflags == 0 &&
+ !(env->singlestep_enabled & SSTEP_NOIRQ))) {
if (interrupt_request & CPU_INTERRUPT_DEBUG) {
env->interrupt_request &= ~CPU_INTERRUPT_DEBUG;
env->exception_index = EXCP_DEBUG;
- [Qemu-devel] [RESEND][PATCH 0/13] Enhance debugging support - 2nd take, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 4/13] Respect length of watchpoints, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 1/13] Return appropriate watch message to gdb, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 3/13] Set mem_io_vaddr on io_read, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 2/13] Refactor and enhance break/watchpoint API, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 5/13] Introduce next_cflags,
Jan Kiszka <=
- [Qemu-devel] [RESEND][PATCH 10/13] Introduce BP_WATCHPOINT_HIT flag, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 8/13] Remove premature memop TB terminations, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 13/13] x86: Debug register emulation, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 11/13] Add debug exception hook, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 7/13] Restore pc on watchpoint hits, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 6/13] Switch self-modified code recompilation to next_cflags, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 12/13] Introduce BP_CPU as a breakpoint type, Jan Kiszka, 2008/08/20
- [Qemu-devel] [RESEND][PATCH 9/13] Improve debugging of SMP guests, Jan Kiszka, 2008/08/20
- Re: [Qemu-devel] [RESEND][PATCH 0/13] Enhance debugging support - 2nd take, Anthony Liguori, 2008/08/21