Since we only leave one gdb thread, or 1 cpu thread, and can use cmd "set"
to switch task context by reusing the thread. So the word "get_cpu_reg",
which stands for "fetch registers' value for cpu thread x", is no longer
appropriate, better using "get_current_task_reg", which stands for "fetch
registers' value for the current task", and makes more sense.
Note: the x86_64_get_cpu_reg() function modification was originally in
the x86_64 stack unwinding support part later, put it here due to not
introducing compiling issues.
Co-developed-by: Aditya Gupta <adityag@xxxxxxxxxxxxx>
Co-developed-by: Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>
Co-developed-by: Tao Liu <ltao@xxxxxxxxxx>
Cc: Sourabh Jain <sourabhjain@xxxxxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Cc: Mahesh J Salgaonkar <mahesh@xxxxxxxxxxxxx>
Cc: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Cc: Lianbo Jiang <lijiang@xxxxxxxxxx>
Cc: HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab@xxxxxxx>
Cc: Tao Liu <ltao@xxxxxxxxxx>
Cc: Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>
Signed-off-by: Tao Liu <ltao@xxxxxxxxxx>
---
crash_target.c | 5 ++---
defs.h | 2 +-
gdb_interface.c | 10 +++++-----
x86_64.c | 22 +++++++++++++++-------
4 files changed, 23 insertions(+), 16 deletions(-)
diff --git a/crash_target.c b/crash_target.c
index 41f0f3a..6ee12d2 100644
--- a/crash_target.c
+++ b/crash_target.c
@@ -26,7 +26,7 @@
void crash_target_init (void);
extern "C" int gdb_readmem_callback(unsigned long, void *, int, int);
-extern "C" int crash_get_cpu_reg (int cpu, int regno, const char *regname,
+extern "C" int crash_get_current_task_reg (int regno, const char *regname,
int regsize, void *val);
extern "C" int gdb_change_thread_context (void);
@@ -66,7 +66,6 @@ public:
static void supply_registers(struct regcache *regcache, int regno)
{
gdb_byte regval[16];
- int cpu = inferior_ptid.tid();
struct gdbarch *arch = regcache->arch ();
const char *regname = gdbarch_register_name(arch, regno);
int regsize = register_size(arch, regno);
@@ -74,7 +73,7 @@ static void supply_registers(struct regcache *regcache, int regno)
if (regsize > sizeof (regval))
error (_("fatal error: buffer size is not enough to fit register value"));
- if (crash_get_cpu_reg (cpu, regno, regname, regsize, (void *)®val))
+ if (crash_get_current_task_reg (regno, regname, regsize, (void *)®val))
regcache->raw_supply (regno, regval);
else
regcache->raw_supply (regno, NULL);
diff --git a/defs.h b/defs.h
index 66b1c93..a2032a2 100644
--- a/defs.h
+++ b/defs.h
@@ -1080,7 +1080,7 @@ struct machdep_table {
void (*get_irq_affinity)(int);
void (*show_interrupts)(int, ulong *);
int (*is_page_ptr)(ulong, physaddr_t *);
- int (*get_cpu_reg)(int, int, const char *, int, void *);
+ int (*get_current_task_reg)(int, const char *, int, void *);
int (*is_cpu_prstatus_valid)(int cpu);
};
diff --git a/gdb_interface.c b/gdb_interface.c
index 8e95e9e..7399fd0 100644
--- a/gdb_interface.c
+++ b/gdb_interface.c
@@ -1067,13 +1067,13 @@ unsigned long crash_get_kaslr_offset(void)
}
/* Callbacks for crash_target */
-int crash_get_cpu_reg (int cpu, int regno, const char *regname,
- int regsize, void *val);
-int crash_get_cpu_reg (int cpu, int regno, const char *regname,
+int crash_get_current_task_reg (int regno, const char *regname,
+ int regsize, void *value);
+int crash_get_current_task_reg (int regno, const char *regname,
int regsize, void *value)
{
- if (!machdep->get_cpu_reg)
+ if (!machdep->get_current_task_reg)
return FALSE;
- return machdep->get_cpu_reg(cpu, regno, regname, regsize, value);
+ return machdep->get_current_task_reg(regno, regname, regsize, value);
}
diff --git a/x86_64.c b/x86_64.c
index 469d26b..fa72c44 100644
--- a/x86_64.c
+++ b/x86_64.c
@@ -126,7 +126,7 @@ static int x86_64_get_framesize(struct bt_info *, ulong, ulong, char *);
static void x86_64_framesize_debug(struct bt_info *);
static void x86_64_get_active_set(void);
static int x86_64_get_kvaddr_ranges(struct vaddr_range *);
-static int x86_64_get_cpu_reg(int, int, const char *, int, void *);
+static int x86_64_get_cpu_reg(int, const char *, int, void *);
static int x86_64_verify_paddr(uint64_t);
static void GART_init(void);
static void x86_64_exception_stacks_init(void);
@@ -195,7 +195,7 @@ x86_64_init(int when)
machdep->machspec->irq_eframe_link = UNINITIALIZED;
machdep->machspec->irq_stack_gap = UNINITIALIZED;
machdep->get_kvaddr_ranges = x86_64_get_kvaddr_ranges;
- machdep->get_cpu_reg = x86_64_get_cpu_reg;
+ machdep->get_current_task_reg = x86_64_get_cpu_reg;
if (machdep->cmdline_args[0])
parse_cmdline_args();
if ((string = pc->read_vmcoreinfo("relocate"))) {
@@ -9074,14 +9074,22 @@ x86_64_get_kvaddr_ranges(struct vaddr_range *vrp)
}
static int
-x86_64_get_cpu_reg(int cpu, int regno, const char *name,
+x86_64_get_cpu_reg(int regno, const char *name,
int size, void *value)
{
- if (regno >= LAST_REGNUM)
- return FALSE;
+ struct task_context *tc;
- if (VMSS_DUMPFILE())
- return vmware_vmss_get_cpu_reg(cpu, regno, name, size, value);
+ tc = CURRENT_CONTEXT();
+ if (!tc)
+ return FALSE;
+
+ if (regno >= LAST_REGNUM)
+ return FALSE;
+ /*
+ * Task is active, grab CPU's registers
+ */
+ if (is_task_active(tc->task) && VMSS_DUMPFILE())
+ return vmware_vmss_get_cpu_reg(tc->processor, regno, name, size, value);
return FALSE;
}
--
2.40.1
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