[RFC PATCH 2/2] rseq/selftests: Introduce __rseq_cs_ptr_array, rename __rseq_table to __rseq_cs

From: Mathieu Desnoyers
Date: Thu Mar 14 2019 - 15:04:03 EST

Next message: Mathieu Desnoyers: "[RFC PATCH 1/2] rseq/selftests: Add __rseq_exit_point_array section for debuggers"
Previous message: Mathieu Desnoyers: "[RFC PATCH 0/2] rseq/selftests: debugger single-stepping helper sections"
In reply to: Mathieu Desnoyers: "[RFC PATCH 0/2] rseq/selftests: debugger single-stepping helper sections"
Next in thread: Mathieu Desnoyers: "[RFC PATCH 1/2] rseq/selftests: Add __rseq_exit_point_array section for debuggers"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

The entries within __rseq_table are aligned on 32 bytes due to
linux/rseq.h struct rseq_cs uapi requirements, but the start of the
__rseq_table section is not guaranteed to be 32-byte aligned. It can
cause padding to be added at the start of the section, which makes it
hard to use as an array of items by debuggers.

Considering that __rseq_table does not really consist of a table due to
the presence of padding, rename this section to __rseq_cs.

Create a new __rseq_cs_ptr_array section which contains 64-bit packed
pointers to entries within the __rseq_cs section.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: Joel Fernandes <joelaf@xxxxxxxxxx>
CC: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CC: Catalin Marinas <catalin.marinas@xxxxxxx>
CC: Dave Watson <davejwatson@xxxxxx>
CC: Will Deacon <will.deacon@xxxxxxx>
CC: Shuah Khan <shuah@xxxxxxxxxx>
CC: Andi Kleen <andi@xxxxxxxxxxxxxx>
CC: linux-kselftest@xxxxxxxxxxxxxxx
CC: "H . Peter Anvin" <hpa@xxxxxxxxx>
CC: Chris Lameter <cl@xxxxxxxxx>
CC: Russell King <linux@xxxxxxxxxxxxxxxx>
CC: Michael Kerrisk <mtk.manpages@xxxxxxxxx>
CC: "Paul E . McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
CC: Paul Turner <pjt@xxxxxxxxxx>
CC: Boqun Feng <boqun.feng@xxxxxxxxx>
CC: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
CC: Steven Rostedt <rostedt@xxxxxxxxxxx>
CC: Ben Maurer <bmaurer@xxxxxx>
CC: linux-api@xxxxxxxxxxxxxxx
CC: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/rseq/rseq-arm.h | 32 +++++++++++++++++--------------
tools/testing/selftests/rseq/rseq-arm64.h | 9 ++++++---
tools/testing/selftests/rseq/rseq-mips.h | 32 +++++++++++++++++--------------
tools/testing/selftests/rseq/rseq-ppc.h | 22 +++++++++++++--------
tools/testing/selftests/rseq/rseq-s390.h | 18 +++++++++++------
tools/testing/selftests/rseq/rseq-x86.h | 19 ++++++++++++------
6 files changed, 81 insertions(+), 51 deletions(-)

diff --git a/tools/testing/selftests/rseq/rseq-arm.h b/tools/testing/selftests/rseq/rseq-arm.h
index 17e8d231943a..5f262c54364f 100644
--- a/tools/testing/selftests/rseq/rseq-arm.h
+++ b/tools/testing/selftests/rseq/rseq-arm.h
@@ -30,24 +30,28 @@ do { \
#include "rseq-skip.h"
#else /* !RSEQ_SKIP_FASTPATH */

-#define __RSEQ_ASM_DEFINE_TABLE(version, flags, start_ip, \
+#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
post_commit_offset, abort_ip) \
- ".pushsection __rseq_table, \"aw\"\n\t" \
+ ".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
+ __rseq_str(label) ":\n\t" \
".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
+ ".word " __rseq_str(label) "b, 0x0\n\t" \
".popsection\n\t"

-#define RSEQ_ASM_DEFINE_TABLE(start_ip, post_commit_ip, abort_ip) \
- __RSEQ_ASM_DEFINE_TABLE(0x0, 0x0, start_ip, \
+#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
+ __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
(post_commit_ip - start_ip), abort_ip)

/*
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
@@ -99,7 +103,7 @@ int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -166,7 +170,7 @@ int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -237,7 +241,7 @@ int rseq_addv(intptr_t *v, intptr_t count, int cpu)

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
#endif
@@ -292,7 +296,7 @@ int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -367,7 +371,7 @@ int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -443,7 +447,7 @@ int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -527,7 +531,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -651,7 +655,7 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
diff --git a/tools/testing/selftests/rseq/rseq-arm64.h b/tools/testing/selftests/rseq/rseq-arm64.h
index 2079f71e0ca2..b41a2a48e965 100644
--- a/tools/testing/selftests/rseq/rseq-arm64.h
+++ b/tools/testing/selftests/rseq/rseq-arm64.h
@@ -82,13 +82,16 @@ do { \

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
post_commit_offset, abort_ip) \
- " .pushsection __rseq_table, \"aw\"\n" \
+ " .pushsection __rseq_cs, \"aw\"\n" \
" .balign 32\n" \
__rseq_str(label) ":\n" \
" .long " __rseq_str(version) ", " __rseq_str(flags) "\n" \
" .quad " __rseq_str(start_ip) ", " \
__rseq_str(post_commit_offset) ", " \
__rseq_str(abort_ip) "\n" \
+ " .popsection\n\t" \
+ " .pushsection __rseq_cs_ptr_array, \"aw\"\n" \
+ " .quad " __rseq_str(label) "b\n" \
" .popsection\n"

#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
@@ -99,8 +102,8 @@ do { \
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
diff --git a/tools/testing/selftests/rseq/rseq-mips.h b/tools/testing/selftests/rseq/rseq-mips.h
index 25d10ff54769..fe3eabcdcbe5 100644
--- a/tools/testing/selftests/rseq/rseq-mips.h
+++ b/tools/testing/selftests/rseq/rseq-mips.h
@@ -54,26 +54,30 @@ do { \
# error unsupported _MIPS_SZLONG
#endif

-#define __RSEQ_ASM_DEFINE_TABLE(version, flags, start_ip, \
+#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \
post_commit_offset, abort_ip) \
- ".pushsection __rseq_table, \"aw\"\n\t" \
+ ".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
+ __rseq_str(label) ":\n\t" \
".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
LONG " " U32_U64_PAD(__rseq_str(start_ip)) "\n\t" \
LONG " " U32_U64_PAD(__rseq_str(post_commit_offset)) "\n\t" \
LONG " " U32_U64_PAD(__rseq_str(abort_ip)) "\n\t" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
+ LONG " " U32_U64_PAD(__rseq_str(label) "b") "\n\t" \
".popsection\n\t"

-#define RSEQ_ASM_DEFINE_TABLE(start_ip, post_commit_ip, abort_ip) \
- __RSEQ_ASM_DEFINE_TABLE(0x0, 0x0, start_ip, \
+#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
+ __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
(post_commit_ip - start_ip), abort_ip)

/*
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
@@ -127,7 +131,7 @@ int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -192,7 +196,7 @@ int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -261,7 +265,7 @@ int rseq_addv(intptr_t *v, intptr_t count, int cpu)

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
#endif
@@ -316,7 +320,7 @@ int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -389,7 +393,7 @@ int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -463,7 +467,7 @@ int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -543,7 +547,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
@@ -664,7 +668,7 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,

rseq_workaround_gcc_asm_size_guess();
__asm__ __volatile__ goto (
- RSEQ_ASM_DEFINE_TABLE(1f, 2f, 4f) /* start, commit, abort */
+ RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail])
#ifdef RSEQ_COMPARE_TWICE
RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1])
diff --git a/tools/testing/selftests/rseq/rseq-ppc.h b/tools/testing/selftests/rseq/rseq-ppc.h
index 24f95649d71e..9df18487fa9f 100644
--- a/tools/testing/selftests/rseq/rseq-ppc.h
+++ b/tools/testing/selftests/rseq/rseq-ppc.h
@@ -33,8 +33,8 @@ do { \
#else /* !RSEQ_SKIP_FASTPATH */

/*
- * The __rseq_table section can be used by debuggers to better handle
- * single-stepping through the restartable critical sections.
+ * The __rseq_cs_ptr_array and __rseq_cs sections can be used by debuggers to
+ * better handle single-stepping through the restartable critical sections.
*/

#ifdef __PPC64__
@@ -46,11 +46,14 @@ do { \

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
start_ip, post_commit_offset, abort_ip) \
- ".pushsection __rseq_table, \"aw\"\n\t" \
+ ".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
__rseq_str(label) ":\n\t" \
".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
".quad " __rseq_str(start_ip) ", " __rseq_str(post_commit_offset) ", " __rseq_str(abort_ip) "\n\t" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
+ ".quad " __rseq_str(label) "b\n\t" \
".popsection\n\t"

#define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \
@@ -67,8 +70,8 @@ do { \
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
@@ -85,20 +88,23 @@ do { \

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
start_ip, post_commit_offset, abort_ip) \
- ".pushsection __rseq_table, \"aw\"\n\t" \
+ ".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
__rseq_str(label) ":\n\t" \
".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
/* 32-bit only supported on BE */ \
".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) "\n\t" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
+ ".long 0x0, " __rseq_str(label) "b\n\t" \
".popsection\n\t"

/*
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
diff --git a/tools/testing/selftests/rseq/rseq-s390.h b/tools/testing/selftests/rseq/rseq-s390.h
index b8b5b6f900af..fbb97815d71c 100644
--- a/tools/testing/selftests/rseq/rseq-s390.h
+++ b/tools/testing/selftests/rseq/rseq-s390.h
@@ -37,19 +37,22 @@ do { \

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
start_ip, post_commit_offset, abort_ip) \
- ".pushsection __rseq_table, \"aw\"\n\t" \
+ ".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
__rseq_str(label) ":\n\t" \
".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
".quad " __rseq_str(start_ip) ", " __rseq_str(post_commit_offset) ", " __rseq_str(abort_ip) "\n\t" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
+ ".quad " __rseq_str(label) "b\n\t" \
".popsection\n\t"

/*
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
@@ -61,19 +64,22 @@ do { \

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
start_ip, post_commit_offset, abort_ip) \
- ".pushsection __rseq_table, \"aw\"\n\t" \
+ ".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
__rseq_str(label) ":\n\t" \
".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
".long 0x0, " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) "\n\t" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
+ ".long 0x0, " __rseq_str(label) "b\n\t" \
".popsection\n\t"

/*
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
diff --git a/tools/testing/selftests/rseq/rseq-x86.h b/tools/testing/selftests/rseq/rseq-x86.h
index 5857570d1c51..2d4887b5d3f0 100644
--- a/tools/testing/selftests/rseq/rseq-x86.h
+++ b/tools/testing/selftests/rseq/rseq-x86.h
@@ -37,13 +37,17 @@ do { \

#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
start_ip, post_commit_offset, abort_ip) \
- ".pushsection __rseq_table, \"aw\"\n\t" \
+ ".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
__rseq_str(label) ":\n\t" \
".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
".quad " __rseq_str(start_ip) ", " __rseq_str(post_commit_offset) ", " __rseq_str(abort_ip) "\n\t" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
+ ".quad " __rseq_str(label) "b\n\t" \
".popsection\n\t"

+
#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
__RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \
(post_commit_ip - start_ip), abort_ip)
@@ -52,8 +56,8 @@ do { \
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
@@ -562,11 +566,14 @@ do { \
*/
#define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, \
start_ip, post_commit_offset, abort_ip) \
- ".pushsection __rseq_table, \"aw\"\n\t" \
+ ".pushsection __rseq_cs, \"aw\"\n\t" \
".balign 32\n\t" \
__rseq_str(label) ":\n\t" \
".long " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \
".long " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \
+ ".popsection\n\t" \
+ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \
+ ".long " __rseq_str(label) "b, 0x0\n\t" \
".popsection\n\t"

#define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \
@@ -577,8 +584,8 @@ do { \
* Exit points of a rseq critical section consist of all instructions outside
* of the critical section where a critical section can either branch to or
* reach through the normal course of its execution. The abort IP and the
- * post-commit IP are already part of the __rseq_table section and should not
- * be explicitly defined as additional exit points. Knowing all exit points is
+ * post-commit IP are already part of the __rseq_cs section and should not be
+ * explicitly defined as additional exit points. Knowing all exit points is
* useful to assist debuggers stepping over the critical section.
*/
#define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \
--
2.11.0

Next message: Mathieu Desnoyers: "[RFC PATCH 1/2] rseq/selftests: Add __rseq_exit_point_array section for debuggers"
Previous message: Mathieu Desnoyers: "[RFC PATCH 0/2] rseq/selftests: debugger single-stepping helper sections"
In reply to: Mathieu Desnoyers: "[RFC PATCH 0/2] rseq/selftests: debugger single-stepping helper sections"
Next in thread: Mathieu Desnoyers: "[RFC PATCH 1/2] rseq/selftests: Add __rseq_exit_point_array section for debuggers"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]