[kvm-unit-tests,PULL] s390x: Catch all exceptions

Commit Message

David Hildenbrand July 11, 2018, 10:59 a.m. UTC

From: Janosch Frank <[e-mail]>

Right now we only catch the exceptions that we really expect to
receive. Let's at least catch all of them and abort if any of the
unexpected ones fell on our foot.

Signed-off-by: Janosch Frank <[e-mail]>
Reviewed-by: Thomas Huth <[e-mail]>
Signed-off-by: David Hildenbrand <[e-mail]>
---
 lib/s390x/asm/interrupt.h |  4 +++
 lib/s390x/interrupt.c     | 24 ++++++++++++++++
 s390x/cstart64.S          | 58 +++++++++++++++++++++++++++++++++++++--
 3 files changed, 83 insertions(+), 3 deletions(-)

Patch

diff --git a/lib/s390x/asm/interrupt.h b/lib/s390x/asm/interrupt.h
index 3ccc8e3..b3abd63 100644
--- a/lib/s390x/asm/interrupt.h
+++ b/lib/s390x/asm/interrupt.h
@@ -12,6 +12,10 @@ 
 #include <asm/arch_def.h>
 
 void handle_pgm_int(void);
+void handle_ext_int(void);
+void handle_mcck_int(void);
+void handle_io_int(void);
+void handle_svc_int(void);
 void expect_pgm_int(void);
 uint16_t clear_pgm_int(void);
 void check_pgm_int_code(uint16_t code);
diff --git a/lib/s390x/interrupt.c b/lib/s390x/interrupt.c
index bc44e3a..848d5f2 100644
--- a/lib/s390x/interrupt.c
+++ b/lib/s390x/interrupt.c
@@ -104,3 +104,27 @@  void handle_pgm_int(void)
 	pgm_int_expected = false;
 	fixup_pgm_int();
 }
+
+void handle_ext_int(void)
+{
+	report_abort("Unexpected external call interrupt: at %#lx",
+		     lc->ext_old_psw.addr);
+}
+
+void handle_mcck_int(void)
+{
+	report_abort("Unexpected machine check interrupt: at %#lx",
+		     lc->mcck_old_psw.addr);
+}
+
+void handle_io_int(void)
+{
+	report_abort("Unexpected io interrupt: at %#lx",
+		     lc->io_old_psw.addr);
+}
+
+void handle_svc_int(void)
+{
+	report_abort("Unexpected service call interrupt: at %#lx",
+		     lc->svc_old_psw.addr);
+}
diff --git a/s390x/cstart64.S b/s390x/cstart64.S
index 9a26ed3..2f02d4d 100644
--- a/s390x/cstart64.S
+++ b/s390x/cstart64.S
@@ -26,6 +26,18 @@  init_psw_cont:
 	/* setup pgm interrupt handler */
 	larl	%r1, pgm_int_psw
 	mvc	GEN_LC_PGM_NEW_PSW(16), 0(%r1)
+	/* setup ext interrupt handler */
+	larl	%r1, ext_int_psw
+	mvc	GEN_LC_EXT_NEW_PSW(16), 0(%r1)
+	/* setup mcck interrupt handler */
+	larl	%r1, mcck_int_psw
+	mvc	GEN_LC_MCCK_NEW_PSW(16), 0(%r1)
+	/* setup io interrupt handler */
+	larl	%r1, ext_int_psw
+	mvc	GEN_LC_IO_NEW_PSW(16), 0(%r1)
+	/* setup svc interrupt handler */
+	larl	%r1, mcck_int_psw
+	mvc	GEN_LC_SVC_NEW_PSW(16), 0(%r1)
 	/* setup cr0, enabling e.g. AFP-register control */
 	larl	%r1, initital_cr0
 	lctlg	%c0, %c0, 0(%r1)
@@ -42,7 +54,7 @@  init_psw_cont:
 	/* call exit() */
 	j exit
 
-pgm_int:
+	.macro SAVE_REGS
 	/* save grs 0-15 */
 	stmg	%r0, %r15, GEN_LC_SW_INT_GRS
 	/* save fprs 0-15 + fpc */
@@ -64,8 +76,9 @@  pgm_int:
 	std	%f14, 112(%r1)
 	std	%f15, 120(%r1)
 	stfpc	GEN_LC_SW_INT_FPC
-	/* call our c handler */
-	brasl	%r14, handle_pgm_int
+	.endm
+
+	.macro RESTORE_REGS
 	/* restore fprs 0-15 + fpc */
 	larl	%r1, GEN_LC_SW_INT_FPRS
 	ld	%f0, 0(%r1)
@@ -87,13 +100,52 @@  pgm_int:
 	lfpc	GEN_LC_SW_INT_FPC
 	/* restore grs 0-15 */
 	lmg	%r0, %r15, GEN_LC_SW_INT_GRS
+	.endm
+
+.section .text
+pgm_int:
+	SAVE_REGS
+	brasl	%r14, handle_pgm_int
+	RESTORE_REGS
 	lpswe	GEN_LC_PGM_OLD_PSW
 
+ext_int:
+	SAVE_REGS
+	brasl	%r14, handle_ext_int
+	RESTORE_REGS
+	lpswe	GEN_LC_EXT_OLD_PSW
+
+mcck_int:
+	SAVE_REGS
+	brasl	%r14, handle_mcck_int
+	RESTORE_REGS
+	lpswe	GEN_LC_MCCK_OLD_PSW
+
+io_int:
+	SAVE_REGS
+	brasl	%r14, handle_io_int
+	RESTORE_REGS
+	lpswe	GEN_LC_IO_OLD_PSW
+
+svc_int:
+	SAVE_REGS
+	brasl	%r14, handle_svc_int
+	RESTORE_REGS
+	lpswe	GEN_LC_SVC_OLD_PSW
+
 	.align	8
 initital_psw:
 	.quad	0x0000000180000000, init_psw_cont
 pgm_int_psw:
 	.quad	0x0000000180000000, pgm_int
+ext_int_psw:
+	.quad	0x0000000180000000, ext_int
+mcck_int_psw:
+	.quad	0x0000000180000000, mcck_int
+io_int_psw:
+	.quad	0x0000000180000000, io_int
+svc_int_psw:
+	.quad	0x0000000180000000, svc_int
 initital_cr0:
 	/* enable AFP-register control, so FP regs (+BFP instr) can be used */
 	.quad	0x0000000000040000