RepoMirrors
/
crash
mirror of https://github.com/crash-utility/crash
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

xen: get stack address via stack_base array if available 

Since many years now the stack address of each percpu stack is
available via the stack_base[] array (Xen commit 3cb68d2b59ab made
it visible). Use that instead of the indirect method via the percpu
variables tss_init or tss_page, especially as the layout of tss_page
has changed in Xen 4.16 (Xen commit 91d26ed304ff5), resulting in the
stack no longer to be found.

Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2023-03-15 12:18:49 +01:00 committed by Kazuhito Hagio
parent 4a59c38be2
commit 9ee564cd1a
1 changed files with 31 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
xen_hyper.c
View File

@ -324,7 +324,7 @@ void
xen_hyper_x86_pcpu_init(void)
{
ulong cpu_info;
ulong init_tss_base, init_tss;
ulong init_tss_base, init_tss, stack_base = 0;
ulong sp;
struct xen_hyper_pcpu_context *pcc;
char *buf, *bp;
@ -340,34 +340,40 @@ xen_hyper_x86_pcpu_init(void)
}
/* get physical cpu context */
xen_hyper_alloc_pcpu_context_space(XEN_HYPER_MAX_CPUS());
if (symbol_exists("per_cpu__init_tss")) {
if (symbol_exists("stack_base")) {
stack_base = symbol_value("stack_base");
flag = 0;
} else if (symbol_exists("per_cpu__init_tss")) {
init_tss_base = symbol_value("per_cpu__init_tss");
flag = TRUE;
flag = 1;
} else if (symbol_exists("per_cpu__tss_page")) {
init_tss_base = symbol_value("per_cpu__tss_page");
flag = TRUE;
init_tss_base = symbol_value("per_cpu__tss_page");
flag = 1;
} else {
init_tss_base = symbol_value("init_tss");
flag = FALSE;
flag = 2;
}
buf = GETBUF(XEN_HYPER_SIZE(tss));
if (flag)
buf = GETBUF(XEN_HYPER_SIZE(tss));
for_cpu_indexes(i, cpuid)
{
if (flag)
init_tss = xen_hyper_per_cpu(init_tss_base, cpuid);
else
init_tss = init_tss_base +
XEN_HYPER_SIZE(tss) * cpuid;
if (!readmem(init_tss, KVADDR, buf,
XEN_HYPER_SIZE(tss), "init_tss", RETURN_ON_ERROR)) {
error(FATAL, "cannot read init_tss.\n");
if (flag) {
if (flag == 1)
init_tss = xen_hyper_per_cpu(init_tss_base, cpuid);
else
init_tss = init_tss_base + XEN_HYPER_SIZE(tss) * cpuid;
readmem(init_tss, KVADDR, buf,
XEN_HYPER_SIZE(tss), "init_tss", FAULT_ON_ERROR);
if (machine_type("X86")) {
sp = ULONG(buf + XEN_HYPER_OFFSET(tss_esp0));
} else if (machine_type("X86_64")) {
sp = ULONG(buf + XEN_HYPER_OFFSET(tss_rsp0));
} else
sp = 0;
} else {
readmem(stack_base + sizeof(ulong) * cpuid, KVADDR, &sp,
sizeof(ulong), "stack_base", FAULT_ON_ERROR);
}
if (machine_type("X86")) {
sp = ULONG(buf + XEN_HYPER_OFFSET(tss_esp0));
} else if (machine_type("X86_64")) {
sp = ULONG(buf + XEN_HYPER_OFFSET(tss_rsp0));
} else
sp = 0;
cpu_info = XEN_HYPER_GET_CPU_INFO(sp);
if (CRASHDEBUG(1)) {
fprintf(fp, "sp=%lx, cpu_info=%lx\n", sp, cpu_info);
@ -377,9 +383,11 @@ xen_hyper_x86_pcpu_init(void)
}
pcc = &xhpct->context_array[cpuid];
xen_hyper_store_pcpu_context(pcc, cpu_info, bp);
xen_hyper_store_pcpu_context_tss(pcc, init_tss, buf);
if (flag)
xen_hyper_store_pcpu_context_tss(pcc, init_tss, buf);
}
FREEBUF(buf);
if (flag)
FREEBUF(buf);
}
#elif defined(IA64)