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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] xenctx: Add -n (--display-stack-pages) option to output larger stack
commit 91450fc02bbdb7ffce3d2d578af37c274cd2b049
Author: Don Slutz <dslutz@xxxxxxxxxxx>
AuthorDate: Thu Apr 3 15:06:54 2014 -0400
Commit: Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Fri Apr 4 09:28:06 2014 +0100
xenctx: Add -n (--display-stack-pages) option to output larger stack
Important: This is the stack size (also known as stack limit) to
display, not the configured stack size.
Note: use with caution (easy to get garbage).
Below is a pictures of a downwards growing configured 3 page stack,
and where the SP currently is. Each box is a page.
+ pages -n 1 -n 2 -n 3
End of Memory
+------------------+
| |
| |
| |
| |
| |
+------------------+
...
+------------------+
| |
| |
| |
| |
MAX+3 | |
+------------------+ *
| | |
| | |
| | |
| | |
MAX+2 | | |
+------------------+ * |
| | | |
| | | |
| | | |
| | | |
MAX+1 | | | |
+------------------+ * | |
| | | | |
SP --> | | * * *
| |
| |
MAX | |
+------------------+
...
+------------------+
| |
| |
| |
| |
0 | |
+------------------+
Display using "-n 3" since the used stack pages is 3.
At a different time, the SP may be in the 1st page and so "-n 3"
will display garbage.
For example:
$ xenctx -s /boot/System.map-2.6.32-279.2.1.el6.x86_64 3 1 -n 1
...
Call Trace:
[<ffffffff81346898>] io_serial_out+0x18 <--
ffff880032bb1310: [<ffffffff81346f51>] serial8250_console_putchar+0x31
ffff880032bb1330: [<ffffffff813428de>] uart_console_write+0x3e
ffff880032bb1338: [<ffffffff8100bc0e>] apic_timer_interrupt+0xe
ffff880032bb1370: [<ffffffff813472ad>] serial8250_console_write+0xbd
ffff880032bb13c0: [<ffffffff8106b8f5>] __call_console_drivers+0x75
ffff880032bb13f0: [<ffffffff8106b95a>] _call_console_drivers+0x4a
ffff880032bb1410: [<ffffffff8106be6e>] release_console_sem+0x4e
ffff880032bb1450: [<ffffffff8106c628>] vprintk+0x248
ffff880032bb14f0: [<ffffffff814fd363>] printk+0x41
$ xenctx -s /boot/System.map-2.6.32-279.2.1.el6.x86_64 3 1 -n 2
...
Call Trace:
[<ffffffff81346898>] io_serial_out+0x18 <--
ffff880032bb1310: [<ffffffff81346f51>] serial8250_console_putchar+0x31
ffff880032bb1330: [<ffffffff813428de>] uart_console_write+0x3e
ffff880032bb1338: [<ffffffff8100bc0e>] apic_timer_interrupt+0xe
ffff880032bb1370: [<ffffffff813472ad>] serial8250_console_write+0xbd
ffff880032bb13c0: [<ffffffff8106b8f5>] __call_console_drivers+0x75
ffff880032bb13f0: [<ffffffff8106b95a>] _call_console_drivers+0x4a
ffff880032bb1410: [<ffffffff8106be6e>] release_console_sem+0x4e
ffff880032bb1450: [<ffffffff8106c628>] vprintk+0x248
ffff880032bb14f0: [<ffffffff814fd363>] printk+0x41
$ xenctx -s /boot/System.map-2.6.32-279.2.1.el6.x86_64 3 1 -n 3
...
Call Trace:
[<ffffffff81346898>] io_serial_out+0x18 <--
ffff880032bb1310: [<ffffffff81346f51>] serial8250_console_putchar+0x31
ffff880032bb1330: [<ffffffff813428de>] uart_console_write+0x3e
ffff880032bb1338: [<ffffffff8100bc0e>] apic_timer_interrupt+0xe
ffff880032bb1370: [<ffffffff813472ad>] serial8250_console_write+0xbd
ffff880032bb13c0: [<ffffffff8106b8f5>] __call_console_drivers+0x75
ffff880032bb13f0: [<ffffffff8106b95a>] _call_console_drivers+0x4a
ffff880032bb1410: [<ffffffff8106be6e>] release_console_sem+0x4e
ffff880032bb1450: [<ffffffff8106c628>] vprintk+0x248
ffff880032bb14f0: [<ffffffff814fd363>] printk+0x41
ffff880032bb3f20: [<ffffffff8100204c>] do_one_initcall+0x3c
ffff880032bb3f50: [<ffffffff810b0eb1>] sys_init_module+0xe1
ffff880032bb3f80: [<ffffffff8100b0f2>] system_call_fastpath+0x16
Signed-off-by: Don Slutz <Don@xxxxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
tools/xentrace/xenctx.c | 26 ++++++++++++++++++++++++--
1 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/tools/xentrace/xenctx.c b/tools/xentrace/xenctx.c
index 134cf55..b740f1e 100644
--- a/tools/xentrace/xenctx.c
+++ b/tools/xentrace/xenctx.c
@@ -35,11 +35,14 @@ static struct xenctx {
int frame_ptrs;
int stack_trace;
int disp_all;
+ int nr_stack_pages;
int all_vcpus;
int self_paused;
xc_dominfo_t dominfo;
} xenctx;
+#define DEFAULT_NR_STACK_PAGES 1
+
#if defined (__i386__) || defined (__x86_64__)
typedef unsigned long long guest_word_t;
#define FMT_32B_WORD "%08llx"
@@ -663,7 +666,8 @@ static int print_stack(vcpu_guest_context_any_t *ctx, int
vcpu, int width)
int i;
stack_limit = ((stack_pointer(ctx) + XC_PAGE_SIZE)
- & ~((guest_word_t) XC_PAGE_SIZE - 1));
+ & ~((guest_word_t) XC_PAGE_SIZE - 1))
+ + (xenctx.nr_stack_pages - 1) * XC_PAGE_SIZE;
printf("\n");
printf("Stack:\n");
for (i=1; i<5 && stack < stack_limit; i++) {
@@ -834,18 +838,24 @@ static void usage(void)
kernel_start);
printf(" -a, --all display more registers\n");
printf(" -C, --all-vcpus print info for all vcpus\n");
+ printf(" -n PAGES, --display-stack-pages=PAGES\n");
+ printf(" Display N pages from the stack pointer.
(default %d)\n",
+ DEFAULT_NR_STACK_PAGES);
+ printf(" Changes stack limit. Note: use with caution
(easy\n");
+ printf(" to get garbage).\n");
}
int main(int argc, char **argv)
{
int ch;
int ret;
- static const char *sopts = "fs:hak:SC";
+ static const char *sopts = "fs:hak:SCn:";
static const struct option lopts[] = {
{"stack-trace", 0, NULL, 'S'},
{"symbol-table", 1, NULL, 's'},
{"frame-pointers", 0, NULL, 'f'},
{"kernel-start", 1, NULL, 'k'},
+ {"display-stack-pages", 0, NULL, 'n'},
{"all", 0, NULL, 'a'},
{"all-vcpus", 0, NULL, 'C'},
{"help", 0, NULL, 'h'},
@@ -855,6 +865,8 @@ int main(int argc, char **argv)
int vcpu = 0;
+ xenctx.nr_stack_pages = DEFAULT_NR_STACK_PAGES;
+
while ((ch = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
switch(ch) {
case 'f':
@@ -869,6 +881,16 @@ int main(int argc, char **argv)
case 'a':
xenctx.disp_all = 1;
break;
+ case 'n':
+ xenctx.nr_stack_pages = strtol(optarg, NULL, 0);
+ if ( xenctx.nr_stack_pages < 1)
+ {
+ fprintf(stderr,
+ "%s: Unsupported value(%d) for --display-stack-pages
'%s'. Needs to be >= 1\n",
+ argv[0], xenctx.nr_stack_pages, optarg);
+ exit(-1);
+ }
+ break;
case 'C':
xenctx.all_vcpus = 1;
break;
--
generated by git-patchbot for /home/xen/git/xen.git#master
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