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git://sourceware.org/git/newlib-cygwin.git
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3b58032de1
Given that nvptx newlib currently restricts itself to ELIX level 1, this
is not already a problem. However, in the following we'd like to lift
that restriction, and then run into:
[...]/newlib/libc/ssp/stack_protector.c: In function ‘__stack_chk_init’:
[...]/newlib/libc/ssp/stack_protector.c:31:1: sorry, unimplemented: global constructors not supported on this target
31 | }
| ^
GCC patch "nvptx: Support global constructors/destructors via 'collect2'"
has been posted, but not yet accepted. Until that is resolved, use the
same manual SSP setup as for GCN.
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#if defined(__AMDGCN__) || defined(__nvptx__)
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/* Global constructors not supported on this target, yet. */
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uintptr_t __stack_chk_guard = 0x00000aff; /* 0, 0, '\n', 255 */
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#else
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uintptr_t __stack_chk_guard = 0;
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void
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__attribute__((__constructor__))
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__stack_chk_init (void)
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{
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if (__stack_chk_guard != 0)
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return;
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#if defined(__CYGWIN__) || defined(__rtems__)
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arc4random_buf(&__stack_chk_guard, sizeof(__stack_chk_guard));
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#else
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/* If getentropy is not available, use the "terminator canary". */
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((unsigned char *)&__stack_chk_guard)[0] = 0;
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((unsigned char *)&__stack_chk_guard)[1] = 0;
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((unsigned char *)&__stack_chk_guard)[2] = '\n';
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((unsigned char *)&__stack_chk_guard)[3] = 255;
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#endif
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}
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#endif
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void
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__attribute__((__noreturn__))
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__stack_chk_fail (void)
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{
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char msg[] = "*** stack smashing detected ***: terminated\n";
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write (2, msg, strlen (msg));
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raise (SIGABRT);
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_exit (127);
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}
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#ifdef __ELF__
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void
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__attribute__((visibility ("hidden")))
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__stack_chk_fail_local (void)
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{
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__stack_chk_fail();
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}
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#endif
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