From e1a6cb7723b350fec2b315da89fa7d2e215ccbf4 Mon Sep 17 00:00:00 2001 From: David Michael Date: Sat, 6 May 2017 12:20:46 -0700 Subject: Support GCC 7 * Makefile.am (clib_routines): Add __udivmoddi4. * linux/src/include/linux/compiler-gcc7.h: New file. --- Makefile.am | 2 +- linux/src/include/linux/compiler-gcc7.h | 67 +++++++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+), 1 deletion(-) create mode 100644 linux/src/include/linux/compiler-gcc7.h diff --git a/Makefile.am b/Makefile.am index 67252db8..e7527ab9 100644 --- a/Makefile.am +++ b/Makefile.am @@ -162,7 +162,7 @@ noinst_PROGRAMS += \ # This is the list of routines we decide is OK to steal from the C library. clib_routines := htonl htons ntohl ntohs \ - udivdi3 __udivdi3 __umoddi3 \ + udivdi3 __udivdi3 __udivmoddi4 __umoddi3 \ __rel_iplt_start __rel_iplt_end \ __ffsdi2 \ _START _start etext _edata end _end # actually ld magic, not libc. diff --git a/linux/src/include/linux/compiler-gcc7.h b/linux/src/include/linux/compiler-gcc7.h new file mode 100644 index 00000000..02c5bea4 --- /dev/null +++ b/linux/src/include/linux/compiler-gcc7.h @@ -0,0 +1,67 @@ +#ifndef __LINUX_COMPILER_H +#error "Please don't include directly, include instead." +#endif + +#define __used __attribute__((__used__)) +#define __must_check __attribute__((warn_unused_result)) +#define __compiler_offsetof(a, b) __builtin_offsetof(a, b) + +/* Mark functions as cold. gcc will assume any path leading to a call + to them will be unlikely. This means a lot of manual unlikely()s + are unnecessary now for any paths leading to the usual suspects + like BUG(), printk(), panic() etc. [but let's keep them for now for + older compilers] + + Early snapshots of gcc 4.3 don't support this and we can't detect this + in the preprocessor, but we can live with this because they're unreleased. + Maketime probing would be overkill here. + + gcc also has a __attribute__((__hot__)) to move hot functions into + a special section, but I don't see any sense in this right now in + the kernel context */ +#define __cold __attribute__((__cold__)) + +#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__) + +#ifndef __CHECKER__ +# define __compiletime_warning(message) __attribute__((warning(message))) +# define __compiletime_error(message) __attribute__((error(message))) +#endif /* __CHECKER__ */ + +/* + * Mark a position in code as unreachable. This can be used to + * suppress control flow warnings after asm blocks that transfer + * control elsewhere. + * + * Early snapshots of gcc 4.5 don't support this and we can't detect + * this in the preprocessor, but we can live with this because they're + * unreleased. Really, we need to have autoconf for the kernel. + */ +#define unreachable() __builtin_unreachable() + +/* Mark a function definition as prohibited from being cloned. */ +#define __noclone __attribute__((__noclone__)) + +/* + * Tell the optimizer that something else uses this function or variable. + */ +#define __visible __attribute__((externally_visible)) + +/* + * GCC 'asm goto' miscompiles certain code sequences: + * + * http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670 + * + * Work it around via a compiler barrier quirk suggested by Jakub Jelinek. + * + * (asm goto is automatically volatile - the naming reflects this.) + */ +#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0) + +#ifdef CONFIG_ARCH_USE_BUILTIN_BSWAP +#define __HAVE_BUILTIN_BSWAP32__ +#define __HAVE_BUILTIN_BSWAP64__ +#define __HAVE_BUILTIN_BSWAP16__ +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP */ + +#define KASAN_ABI_VERSION 4 -- cgit v1.2.3