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powerpc/signal: Report minimum signal frame size to userspace via AT_MINSIGSTKSZ

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Implement the AT_MINSIGSTKSZ AUXV entry, allowing userspace to
dynamically size stack allocations in a manner forward-compatible with
new processor state saved in the signal frame

For now these statically find the maximum signal frame size rather than
doing any runtime testing of features to minimise the size.

glibc 2.34 will take advantage of this, as will applications that use
use _SC_MINSIGSTKSZ and _SC_SIGSTKSZ.

Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
References: 94b07c1f8c ("arm64: signal: Report signal frame size to userspace via auxv")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220307182734.289289-2-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
2022-03-08 04:27:34 +10:00
committed by Michael Ellerman
parent 2f82ec1975
commit 2896b2dff4
6 changed files with 47 additions and 2 deletions
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arch/powerpc/include/uapi/asm/auxvec.h
+3 -1
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@@ -48,6 +48,8 @@
#define AT_L3_CACHESIZE 46
#define AT_L3_CACHEGEOMETRY 47
#define AT_VECTOR_SIZE_ARCH 14 /* entries in ARCH_DLINFO */
#define AT_MINSIGSTKSZ 51 /* stack needed for signal delivery */
#define AT_VECTOR_SIZE_ARCH 15 /* entries in ARCH_DLINFO */
#endif