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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

30
tools/testing/selftests/rseq/rseq-x86.h
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@@ -141,7 +141,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
[v] "m" (*v),
[expect] "r" (expect),
[newv] "r" (newv)
@@ -207,7 +207,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* final store input */
[v] "m" (*v),
[expectnot] "r" (expectnot),
@@ -258,7 +258,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* final store input */
[v] "m" (*v),
[count] "er" (count)
@@ -314,7 +314,7 @@ int rseq_offset_deref_addv(intptr_t *ptr, off_t off, intptr_t inc, int cpu)
RSEQ_ASM_DEFINE_ABORT(4, "", abort)
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* final store input */
[ptr] "m" (*ptr),
[off] "er" (off),
@@ -372,7 +372,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* try store input */
[v2] "m" (*v2),
[newv2] "r" (newv2),
@@ -449,7 +449,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* cmp2 input */
[v2] "m" (*v2),
[expect2] "r" (expect2),
@@ -555,7 +555,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
#endif
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* final store input */
[v] "m" (*v),
[expect] "r" (expect),
@@ -719,7 +719,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
[v] "m" (*v),
[expect] "r" (expect),
[newv] "r" (newv)
@@ -785,7 +785,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* final store input */
[v] "m" (*v),
[expectnot] "r" (expectnot),
@@ -836,7 +836,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* final store input */
[v] "m" (*v),
[count] "ir" (count)
@@ -894,7 +894,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* try store input */
[v2] "m" (*v2),
[newv2] "m" (newv2),
@@ -962,7 +962,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* try store input */
[v2] "m" (*v2),
[newv2] "r" (newv2),
@@ -1032,7 +1032,7 @@ 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),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* cmp2 input */
[v2] "m" (*v2),
[expect2] "r" (expect2),
@@ -1142,7 +1142,7 @@ int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect,
#endif
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* final store input */
[v] "m" (*v),
[expect] "m" (expect),
@@ -1255,7 +1255,7 @@ int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect,
#endif
: /* gcc asm goto does not allow outputs */
: [cpu_id] "r" (cpu),
[rseq_abi] "r" (&__rseq_abi),
[rseq_abi] "r" (rseq_get_abi()),
/* final store input */
[v] "m" (*v),
[expect] "m" (expect),