From: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
With this patch on s390 a program check interrupt is emitted if purgatory
checksums are not valid. This establishes a error handling mechanism where
the caller of crash_kexec/purgatory can catch the error by installing a
program check handler function. On s390 this will be used by our stand-alone
dump tools. The tools first get control and install a program check handler.
Then if kdump is pre-loaded, the dump tools jump into the old kernel where
crash_kexec->purgatory is executed. If kdump fails on this code path, a
program check is emitted and then control is passed back to the stand-alone
dump tools that will then create a full-blown dump as backup mechanism.
Signed-off-by: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
---
purgatory/arch/i386/purgatory-x86.c | 7 +++++++
purgatory/arch/ia64/purgatory-ia64.c | 7 +++++++
purgatory/arch/ppc/purgatory-ppc.c | 7 +++++++
purgatory/arch/ppc64/purgatory-ppc64.c | 7 +++++++
purgatory/arch/s390/purgatory-s390.c | 11 +++++++++++
purgatory/arch/x86_64/purgatory-x86_64.c | 7 +++++++
purgatory/include/purgatory.h | 1 +
purgatory/purgatory.c | 4 +---
8 files changed, 48 insertions(+), 3 deletions(-)
--- a/purgatory/arch/i386/purgatory-x86.c
+++ b/purgatory/arch/i386/purgatory-x86.c
@@ -55,3 +55,10 @@ void post_verification_setup_arch(void)
if (panic_kernel) crashdump_backup_memory();
if (jump_back_entry) x86_setup_jump_back_entry();
}
+
+void sha256_digest_failed(void)
+{
+ for(;;) {
+ /* loop forever */
+ }
+}
--- a/purgatory/arch/ia64/purgatory-ia64.c
+++ b/purgatory/arch/ia64/purgatory-ia64.c
@@ -305,3 +305,10 @@ void post_verification_setup_arch(void)
{
/* Nothing for now */
}
+
+void sha256_digest_failed(void)
+{
+ for(;;) {
+ /* loop forever */
+ }
+}
--- a/purgatory/arch/ppc/purgatory-ppc.c
+++ b/purgatory/arch/ppc/purgatory-ppc.c
@@ -44,3 +44,10 @@ void crashdump_backup_memory(void)
{
return;
}
+
+void sha256_digest_failed(void)
+{
+ for(;;) {
+ /* loop forever */
+ }
+}
--- a/purgatory/arch/ppc64/purgatory-ppc64.c
+++ b/purgatory/arch/ppc64/purgatory-ppc64.c
@@ -40,3 +40,10 @@ void post_verification_setup_arch(void)
if (panic_kernel)
crashdump_backup_memory();
}
+
+void sha256_digest_failed(void)
+{
+ for(;;) {
+ /* loop forever */
+ }
+}
--- a/purgatory/arch/s390/purgatory-s390.c
+++ b/purgatory/arch/s390/purgatory-s390.c
@@ -6,6 +6,12 @@
* Author(s): Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
*/
+#define EMIT_PGM_CHECK() do { \
+ asm volatile( \
+ "0: j 0b+2\n" \
+ : :); \
+} while (0)
+
unsigned long kdump_psw_addr = 0;
void setup_arch(void)
@@ -15,3 +21,8 @@ void setup_arch(void)
void post_verification_setup_arch(void)
{
}
+
+void sha256_digest_failed(void)
+{
+ EMIT_PGM_CHECK();
+}
--- a/purgatory/arch/x86_64/purgatory-x86_64.c
+++ b/purgatory/arch/x86_64/purgatory-x86_64.c
@@ -28,3 +28,10 @@ void post_verification_setup_arch(void)
if (panic_kernel) crashdump_backup_memory();
if (jump_back_entry) x86_setup_jump_back_entry();
}
+
+void sha256_digest_failed(void)
+{
+ for(;;) {
+ /* loop forever */
+ }
+}
--- a/purgatory/include/purgatory.h
+++ b/purgatory/include/purgatory.h
@@ -6,5 +6,6 @@ void sprintf(char *buffer, const char *f
void printf(const char *fmt, ...);
void setup_arch(void);
void post_verification_setup_arch(void);
+void sha256_digest_failed(void);
#endif /* PURGATORY_H */
--- a/purgatory/purgatory.c
+++ b/purgatory/purgatory.c
@@ -34,9 +34,7 @@ void verify_sha256_digest(void)
printf("%hhx ", sha256_digest[i]);
}
printf("\n");
- for(;;) {
- /* loop forever */
- }
+ sha256_digest_failed();
}
}
--
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