This is an automated email from the git hooks/post-receive script. It was generated because a ref change was pushed to the repository containing the project "uClibc-ng - small C library for embedded systems". The branch, master has been updated via 322fdd37d307a12c913be78cebcc348a77731dd3 (commit) from c725f1deaef5bbfb22c83fbfc221a86255a3072b (commit) Those revisions listed above that are new to this repository have not appeared on any other notification email; so we list those revisions in full, below. - Log ----------------------------------------------------------------- ----------------------------------------------------------------------- Summary of changes: extra/Configs/Config.arm | 8 +++ extra/Configs/Config.in | 1 - libc/sysdeps/linux/arm/clone.S | 14 ++--- .../linuxthreads.old/sysdeps/arm/pt-machine.h | 56 +++++++++++++++++--- 4 files changed, 65 insertions(+), 14 deletions(-) diff --git a/extra/Configs/Config.arm b/extra/Configs/Config.arm index a16c919..00cf982 100644 --- a/extra/Configs/Config.arm +++ b/extra/Configs/Config.arm @@ -28,6 +28,7 @@ config CONFIG_ARM_EABI config COMPILE_IN_THUMB_MODE bool "Build using Thumb mode" select USE_BX + select USE_LDREXSTREX help Say 'y' here to force building uClibc in thumb mode. Say 'n' to use your compiler's default mode. @@ -38,3 +39,10 @@ config USE_BX Say 'y' to use BX to return from functions on your thumb-aware processor. Say 'y' if you need to use interworking. Say 'n' if not. It is safe to say 'y' even if you're not doing interworking. + +config USE_LDREXSTREX + bool "Use load-store exclusive ASM ops (not supported in SmartFusion)" + depends on COMPILE_IN_THUMB_MODE + default n + help + Say 'y' to use LDREX/STREX ASM ops. diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in index c7a3b2d..31944be 100644 --- a/extra/Configs/Config.in +++ b/extra/Configs/Config.in @@ -524,7 +524,6 @@ config LINUXTHREADS_OLD # linuxthreads and linuxthreads.old need nanosleep() select UCLIBC_HAS_REALTIME depends on !TARGET_arc && \ - !TARGET_arm && \ !TARGET_i386 && \ !TARGET_metag && \ !TARGET_mips && \ diff --git a/libc/sysdeps/linux/arm/clone.S b/libc/sysdeps/linux/arm/clone.S index 29045ef..d1c9239 100644 --- a/libc/sysdeps/linux/arm/clone.S +++ b/libc/sysdeps/linux/arm/clone.S @@ -26,7 +26,10 @@ #include <sys/syscall.h> #include <bits/arm_asm.h> #include <bits/arm_bx.h> + +#if defined __UCLIBC_HAS_THREADS__ && !defined __LINUXTHREADS_OLD__ #include <sysdep-cancel.h> +#endif #define CLONE_VM 0x00000100 #define CLONE_THREAD 0x00010000 @@ -57,23 +60,22 @@ __clone: @ get flags mov r0, r2 @ new sp is already in r1 - @ load remaining arguments off the stack - stmfd sp!, {r4} - ldr r2, [sp, #4] - ldr r3, [sp, #8] - ldr r4, [sp, #12] DO_CALL (clone) movs a1, a1 blt __error - ldmnefd sp!, {r4} beq 1f bx lr 1: @ pick the function arg and call address off the stack and execute ldr r0, [sp, #4] +#if defined(__USE_BX__) ldr r1, [sp] bl 2f @ blx r1 +#else + mov lr, pc + ldr pc, [sp] +#endif @ and we are done, passing the return value through r0 bl HIDDEN_JUMPTARGET(_exit) diff --git a/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h b/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h index 438c12a..2b877f9 100644 --- a/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h +++ b/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h @@ -21,12 +21,50 @@ #ifndef _PT_MACHINE_H #define _PT_MACHINE_H 1 -#include <features.h> +#include <sys/syscall.h> +#include <unistd.h> #ifndef PT_EI # define PT_EI __extern_always_inline #endif +#if defined(__thumb__) +#if defined(__USE_LDREXSTREX__) +PT_EI long int ldrex(int *spinlock) +{ + long int ret; + __asm__ __volatile__( + "ldrex %0, [%1]\n" + : "=r"(ret) + : "r"(spinlock) : "memory"); + return ret; +} + +PT_EI long int strex(int val, int *spinlock) +{ + long int ret; + __asm__ __volatile__( + "strex %0, %1, [%2]\n" + : "=r"(ret) + : "r" (val), "r"(spinlock) : "memory"); + return ret; +} + +/* Spinlock implementation; required. */ +PT_EI long int +testandset (int *spinlock) +{ + register unsigned int ret; + + do { + ret = ldrex(spinlock); + } while (strex(1, spinlock)); + + return ret; +} + +#else /* __USE_LDREXSTREX__ */ + /* This will not work on ARM1 or ARM2 because SWP is lacking on those machines. Unfortunately we have no way to detect this at compile time; let's hope nobody tries to use one. */ @@ -36,8 +74,6 @@ PT_EI long int testandset (int *spinlock); PT_EI long int testandset (int *spinlock) { register unsigned int ret; - -#if defined(__thumb__) void *pc; __asm__ __volatile__( ".align 0\n" @@ -50,15 +86,21 @@ PT_EI long int testandset (int *spinlock) "\t.force_thumb" : "=r"(ret), "=r"(pc) : "0"(1), "r"(spinlock)); -#else + return ret; +} +#endif +#else /* __thumb__ */ + +PT_EI long int testandset (int *spinlock); +PT_EI long int testandset (int *spinlock) +{ + register unsigned int ret; __asm__ __volatile__("swp %0, %1, [%2]" : "=r"(ret) : "0"(1), "r"(spinlock)); -#endif - return ret; } - +#endif /* Get some notion of the current stack. Need not be exactly the top of the stack, just something somewhere in the current frame. */ hooks/post-receive -- uClibc-ng - small C library for embedded systems