Dixi quod… >Geert Uytterhoeven dixit: > >>Yes, you should use the syscall, as finding out whether cas is safe >>or not from userspace is non-trivial.
>by the particular libc. So I guess I will have to “repurpose” a >few lines from the libgcc helper. Does this look sound to you (all of you) and not close enough to the actual libgcc source to be a derived work of it? (Went through quite a few iterations of it… I hate GCC’s inline asm!) Description: add Linux/m68k atomic code Origin: libgcc 4.7 Bug: https://bugs.php.net/bug.php?id=60925 Author: Thorsten Glaser <[email protected]> Index: php5-5.4.0/sapi/fpm/fpm/fpm_atomic.h =================================================================== --- php5-5.4.0.orig/sapi/fpm/fpm/fpm_atomic.h 2011-06-26 15:48:11.000000000 +0000 +++ php5-5.4.0/sapi/fpm/fpm/fpm_atomic.h 2012-03-12 21:11:44.000000000 +0000 @@ -5,6 +5,12 @@ #ifndef FPM_ATOMIC_H #define FPM_ATOMIC_H 1 +#if defined(__m68k__) +#define _GNU_SOURCE +#include <unistd.h> +#include <sys/syscall.h> +#endif + #if HAVE_INTTYPES_H # include <inttypes.h> #else @@ -137,6 +143,34 @@ #error Sparc v8 and predecessors are not and will not be supported (see bug report 53310) #endif /* #if (__sparcv9 || __sparcv9__) */ +#elif defined(__m68k__) && defined(__linux__) + +typedef signed int atomic_int_t __attribute__((__aligned__(4))); +typedef unsigned int atomic_uint_t __attribute__((__aligned__(4))); +typedef volatile unsigned int atomic_t __attribute__((__aligned__(4))); + +#ifndef SYS_atomic_cmpxchg_32 +#define SYS_atomic_cmpxchg_32 335 +#endif + +static inline atomic_uint_t atomic_cas_32(atomic_t *lock, atomic_uint_t old, atomic_uint_t new) /* {{{ */ +{ + register atomic_t *a0 asm("a0") = lock; + register atomic_uint_t d2 asm("d2") = old; + register atomic_uint_t d1 asm("d1") = new; + register atomic_uint_t d0 asm("d0") = SYS_atomic_cmpxchg_32; + + asm volatile("trap #0" : "+r" (d0), "+r" (d1), "+r" (a0) : "r" (d2) : "memory", "a1"); + return (d0); +} +/* }}} */ + +static inline atomic_uint_t atomic_cmp_set(atomic_t *lock, atomic_uint_t old, atomic_uint_t set) /* {{{ */ +{ + return (atomic_cas_32(lock, old, set) == old); +} +/* }}} */ + #else #error Unsupported processor. Please open a bug report (bugs.php.net). bye, //mirabilos -- .intel_syntax noprefix .code16 .text reboot: ljmp 0xF000,0xFFF0 -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
