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[PATCH v2 41/43] bsd-user: Implement cpu_copy() helper routine
From: |
imp |
Subject: |
[PATCH v2 41/43] bsd-user: Implement cpu_copy() helper routine |
Date: |
Thu, 26 Aug 2021 15:11:59 -0600 |
From: Warner Losh <imp@FreeBSD.org>
cpu_copy shouldbe called when processes are creating new threads. It
copies the current state of the CPU to a new cpu state needed for the
new thread.
Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Justin Hibbits <chmeeedalf@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
bsd-user/main.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/bsd-user/main.c b/bsd-user/main.c
index e2ed9e32ba..b35bcf4d1e 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -180,6 +180,36 @@ void init_task_state(TaskState *ts)
ts->sigqueue_table[i].next = NULL;
}
+CPUArchState *cpu_copy(CPUArchState *env)
+{
+ CPUState *cpu = env_cpu(env);
+ CPUState *new_cpu = cpu_create(cpu_type);
+ CPUArchState *new_env = new_cpu->env_ptr;
+ CPUBreakpoint *bp;
+ CPUWatchpoint *wp;
+
+ /* Reset non arch specific state */
+ cpu_reset(new_cpu);
+
+ memcpy(new_env, env, sizeof(CPUArchState));
+
+ /*
+ * Clone all break/watchpoints.
+ * Note: Once we support ptrace with hw-debug register access, make sure
+ * BP_CPU break/watchpoints are handled correctly on clone.
+ */
+ QTAILQ_INIT(&cpu->breakpoints);
+ QTAILQ_INIT(&cpu->watchpoints);
+ QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
+ cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
+ }
+ QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
+ cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL);
+ }
+
+ return new_env;
+}
+
void gemu_log(const char *fmt, ...)
{
va_list ap;
--
2.32.0
- Re: [PATCH v2 30/43] bsd-user: Remove dead #ifdefs from elfload.c, (continued)
[PATCH v2 36/43] bsd-user: add stubbed out core dump support, imp, 2021/08/26
[PATCH v2 38/43] bsd-user: Refactor load_elf_sections and is_target_elf_binary, imp, 2021/08/26
[PATCH v2 42/43] bsd-user: Add '-0 argv0' option to bsd-user/main.c, imp, 2021/08/26
[PATCH v2 37/43] bsd-user: elfload.c style catch up patch, imp, 2021/08/26
[PATCH v2 41/43] bsd-user: Implement cpu_copy() helper routine,
imp <=
[PATCH v2 35/43] bsd-user: Add target_os_user.h to capture the user/kernel structures, imp, 2021/08/26
[PATCH v2 23/43] bsd-user: define max args in terms of pages, imp, 2021/08/26
[PATCH v2 40/43] bsd-user: Implement interlock for atomic operations, imp, 2021/08/26
[PATCH v2 43/43] bsd-user: Update mapping to handle reserved and starting conditions, imp, 2021/08/26