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@efficios.com CC: Thomas Gleixner tglx@linutronix.de CC: Joel Fernandes joelaf@google.com CC: Peter Zijlstra peterz@infradead.org CC: Catalin Marinas catalin.marinas@arm.com CC: Dave Watson davejwatson@fb.com CC: Will Deacon will.deacon@arm.com CC: Shuah Khan shuah@kernel.org CC: Andi Kleen andi@firstfloor.org CC: linux-kselftest@vger.kernel.org CC: "H . Peter Anvin" hpa@zytor.com CC: Chris Lameter cl@linux.com CC: Russell King linux@arm.linux.org.uk CC: Michael Kerrisk mtk.manpages@gmail.com CC: "Paul E . McKenney" paulmck@linux.vnet.ibm.com CC: Paul Turner pjt@google.com CC: Boqun Feng boqun.feng@gmail.com CC: Josh Triplett josh@joshtriplett.org CC: Steven Rostedt rostedt@goodmis.org CC: Ben Maurer bmaurer@fb.com CC: linux-api@vger.kernel.org CC: Andy Lutomirski luto@amacapital.net CC: Andrew Morton akpm@linux-foundation.org CC: Linus Torvalds torvalds@linux-foundation.org --- 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) \