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3b2b88ccee
This patch replaces _dl_stack_flags global variable by _dl_stack_prot_flags. The advantage is that any convertion from p_flags to final used mprotect flags occurs at loading of p_flags. It avoids repeated spurious convertions of _dl_stack_flags, for example in allocate_thread_stack. This modification was suggested in: https://sourceware.org/pipermail/libc-alpha/2025-March/165537.html Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
41 lines
941 B
C
41 lines
941 B
C
#ifndef _ALLOCA_H
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#include <stdlib/alloca.h>
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# ifndef _ISOMAC
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#include <elf.h>
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#undef __alloca
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/* Now define the internal interfaces. */
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extern void *__alloca (size_t __size);
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#ifdef __GNUC__
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# define __alloca(size) __builtin_alloca (size)
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#endif /* GCC. */
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extern int __libc_use_alloca (size_t size) __attribute__ ((const));
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extern int __libc_alloca_cutoff (size_t size) __attribute__ ((const));
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libc_hidden_proto (__libc_alloca_cutoff)
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#define __MAX_ALLOCA_CUTOFF 65536
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#include <allocalim.h>
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#if defined stackinfo_get_sp && defined stackinfo_sub_sp
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# define alloca_account(size, avar) \
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({ void *old__ = stackinfo_get_sp (); \
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void *m__ = __alloca (size); \
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avar += stackinfo_sub_sp (old__); \
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m__; })
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#else
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# define alloca_account(size, avar) \
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({ size_t s__ = (size); \
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avar += s__; \
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__alloca (s__); })
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#endif
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# endif /* !_ISOMAC */
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#endif
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