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selftests/rseq: Introduce rseq_get_abi() helper

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This is done in preparation for the selftest uplift to become compatible
with glibc-2.35.

glibc-2.35 exposes the rseq per-thread data in the TCB, accessible
at an offset from the thread pointer, rather than through an actual
Thread-Local Storage (TLS) variable, as the kernel selftests initially
expected.

Introduce a rseq_get_abi() helper, initially using the __rseq_abi
TLS variable, in preparation for changing this userspace ABI for one
which is compatible with glibc-2.35.

Note that the __rseq_abi TLS and glibc-2.35's ABI for per-thread data
cannot actively coexist in a process, because the kernel supports only
a single rseq registration per thread.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220124171253.22072-6-mathieu.desnoyers@efficios.com
This commit is contained in:
Mathieu Desnoyers
2022-01-24 12:12:43 -05:00
committed by Peter Zijlstra
parent 94b80a19eb
commit e546cd48cc
7 changed files with 99 additions and 94 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
tools/testing/selftests/rseq/rseq-ppc.h
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@@ -235,8 +235,8 @@ int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu)
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (__rseq_abi.cpu_id),
[rseq_cs] "m" (__rseq_abi.rseq_cs),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs),
[v] "m" (*v),
[expect] "r" (expect),
[newv] "r" (newv)
@@ -301,8 +301,8 @@ int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot,
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (__rseq_abi.cpu_id),
[rseq_cs] "m" (__rseq_abi.rseq_cs),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs),
/* final store input */
[v] "m" (*v),
[expectnot] "r" (expectnot),
@@ -359,8 +359,8 @@ int rseq_addv(intptr_t *v, intptr_t count, int cpu)
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (__rseq_abi.cpu_id),
[rseq_cs] "m" (__rseq_abi.rseq_cs),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs),
/* final store input */
[v] "m" (*v),
[count] "r" (count)
@@ -419,8 +419,8 @@ int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect,
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (__rseq_abi.cpu_id),
[rseq_cs] "m" (__rseq_abi.rseq_cs),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs),
/* try store input */
[v2] "m" (*v2),
[newv2] "r" (newv2),
@@ -489,8 +489,8 @@ int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect,
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (__rseq_abi.cpu_id),
[rseq_cs] "m" (__rseq_abi.rseq_cs),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs),
/* try store input */
[v2] "m" (*v2),
[newv2] "r" (newv2),
@@ -560,8 +560,8 @@ int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect,
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (__rseq_abi.cpu_id),
[rseq_cs] "m" (__rseq_abi.rseq_cs),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs),
/* cmp2 input */
[v2] "m" (*v2),
[expect2] "r" (expect2),
@@ -635,8 +635,8 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (__rseq_abi.cpu_id),
[rseq_cs] "m" (__rseq_abi.rseq_cs),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs),
/* final store input */
[v] "m" (*v),
[expect] "r" (expect),
@@ -711,8 +711,8 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
RSEQ_ASM_DEFINE_ABORT(4, abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[current_cpu_id] "m" (__rseq_abi.cpu_id),
[rseq_cs] "m" (__rseq_abi.rseq_cs),
[current_cpu_id] "m" (rseq_get_abi()->cpu_id),
[rseq_cs] "m" (rseq_get_abi()->rseq_cs),
/* final store input */
[v] "m" (*v),
[expect] "r" (expect),