Author: andrew Date: Wed Dec 23 15:22:44 2015 New Revision: 292659 URL: https://svnweb.freebsd.org/changeset/base/292659
Log: Increase the size and alignment of the setjmp buffer. This will allow for possible future CPU extentions with larger registers. jmp_buf's size and alignment are baked into the ABI of third party libraries and thus are very hard to change later so it is best to waste a small amount of space now. Reviewed by: brooks Differential Revision: https://reviews.freebsd.org/D3956 Modified: head/sys/arm64/include/setjmp.h Modified: head/sys/arm64/include/setjmp.h ============================================================================== --- head/sys/arm64/include/setjmp.h Wed Dec 23 14:31:26 2015 (r292658) +++ head/sys/arm64/include/setjmp.h Wed Dec 23 15:22:44 2015 (r292659) @@ -43,13 +43,12 @@ * - 11 general purpose registers * - 8 floating point registers * - The signal mask (128 bits) - * i.e. 24 64-bit words, this can be rounded up to 32 to give us some - * space to expand into without affecting the ABI. - * XXX: Is this enough space for expansion? + * i.e. 24 64-bit words, round this up to 31(+1) 128-bit words to allow for + * CPU extensions with larger registers and stronger alignment requirements. * * The registers to save are: r19 to r29, and d8 to d15. */ -#define _JBLEN 32 +#define _JBLEN 31 #define _JB_SIGMASK 21 /* This should only be needed in libc and may change */ @@ -65,10 +64,10 @@ * internally to avoid some run-time errors for mismatches. */ #if __BSD_VISIBLE || __POSIX_VISIBLE || __XSI_VISIBLE -typedef struct _sigjmp_buf { long _sjb[_JBLEN + 1]; } sigjmp_buf[1]; +typedef struct _sigjmp_buf { __int128_t _sjb[_JBLEN + 1]; } sigjmp_buf[1]; #endif -typedef struct _jmp_buf { long _jb[_JBLEN + 1]; } jmp_buf[1]; +typedef struct _jmp_buf { __int128_t _jb[_JBLEN + 1]; } jmp_buf[1]; #endif /* __ASSEMBLER__ */ #endif /* !_MACHINE_SETJMP_H_ */ _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
