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- Log ----------------------------------------------------------------- commit feb9f08cfe8ddd1fd4fb62265e17ee35147ab268 Author: Thomas Petazzoni thomas.petazzoni@free-electrons.com Date: Sun Mar 20 17:58:35 2016 +0100

arm: simplify handling of Thumb related options

Currently, the Thumb support on ARM has three related Config.in options, which are not trivial for users to understand, and are in fact not needed:

- The USE_BX option is not needed: knowing whether BX is available or not is easy. If you have an ARM > v4 or ARMv4T, then BX is available, otherwise it's not. This is the logic used in glibc.

- The USE_LDREXSTREX option is not needed: whenever Thumb2 is available, ldrex/strex are available, so we can simply rely on __thumb2__ to determine whether ldrex/strex should be used, without requiring a Config.in option.

- Once USE_BX and USE_LDREXSTREX are removed, the only thing left that COMPILE_IN_THUMB does is to set -mthumb. This makes the option unnecessary, as on ARM at least, the user is already supposed to pass -march=<foo> or other compiler options tuning the library for a specific ARM variant. There is no reason to do otherwise for Thumb, which allows to get rid of the COMPILE_IN_THUMB option.

Signed-off-by: Thomas Petazzoni thomas.petazzoni@free-electrons.com

commit 4ab024d22980cf493dc95a089353df6ebc743f46 Author: Max Filippov jcmvbkbc@gmail.com Date: Tue Mar 22 02:13:05 2016 +0300

xtensa: fix __sigsetjmp call12 case

Register window saving loop in __sigsetjmp incorrectly calculates offset in the jmp_buf in case it was called with call12. The bug was introduced in commit f4b1b7ade7971141 "xtensa: fix setjmp that didn't save all registers correctly".

Signed-off-by: Max Filippov jcmvbkbc@gmail.com

-----------------------------------------------------------------------

Summary of changes: Rules.mak | 1 - extra/Configs/Config.arm | 22 ---------------------- libc/sysdeps/linux/arm/bits/arm_bx.h | 10 ++++------ libc/sysdeps/linux/arm/clone.S | 2 +- libc/sysdeps/linux/xtensa/setjmp.S | 2 +- .../linuxthreads.old/sysdeps/arm/pt-machine.h | 7 +++---- 6 files changed, 9 insertions(+), 35 deletions(-)

diff --git a/Rules.mak b/Rules.mak index fc53ad1..dc1a02e 100644 --- a/Rules.mak +++ b/Rules.mak @@ -392,7 +392,6 @@ endif ifeq ($(TARGET_ARCH),arm) CPU_CFLAGS-$(ARCH_LITTLE_ENDIAN)+=-mlittle-endian CPU_CFLAGS-$(ARCH_BIG_ENDIAN)+=-mbig-endian - CPU_CFLAGS-$(COMPILE_IN_THUMB_MODE)+=-mthumb endif

ifeq ($(TARGET_ARCH),metag) diff --git a/extra/Configs/Config.arm b/extra/Configs/Config.arm index 00cf982..0d02e3f 100644 --- a/extra/Configs/Config.arm +++ b/extra/Configs/Config.arm @@ -24,25 +24,3 @@ config CONFIG_ARM_EABI

If you say 'n' here, then the library will be built for the old Linux ABI. - -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. - -config USE_BX - bool "Use BX in function return" - help - 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/libc/sysdeps/linux/arm/bits/arm_bx.h b/libc/sysdeps/linux/arm/bits/arm_bx.h index 2c29089..1c775b6 100644 --- a/libc/sysdeps/linux/arm/bits/arm_bx.h +++ b/libc/sysdeps/linux/arm/bits/arm_bx.h @@ -23,13 +23,11 @@ #error Please include features.h first #endif /* features.h not yet included */

-#if defined(__USE_BX__) -# if (__ARM_ARCH <= 4 && !defined __ARM_ARCH_4T__) -# error Use of BX was requested, but is not available on the target processor. -# endif /* ARCH level */ -#endif /* __USE_BX__ */ +#if __ARM_ARCH > 4 || defined (__ARM_ARCH_4T__) +# define ARCH_HAS_BX +#endif

-#if defined(__USE_BX__) && (__ARM_ARCH > 4 || (__ARM_ARCH == 4 && defined __ARM_ARCH_4T__)) +#if defined(ARCH_HAS_BX) # define BX(reg) bx reg # define BXC(cond, reg) bx##cond reg #else diff --git a/libc/sysdeps/linux/arm/clone.S b/libc/sysdeps/linux/arm/clone.S index b4c7d8a..fd7590d 100644 --- a/libc/sysdeps/linux/arm/clone.S +++ b/libc/sysdeps/linux/arm/clone.S @@ -69,7 +69,7 @@ __clone:

@ pick the function arg and call address off the stack and execute ldr r0, [sp, #4] -#if defined(__USE_BX__) +#if defined(ARCH_HAS_BX) ldr r1, [sp] bl 2f @ blx r1 #else diff --git a/libc/sysdeps/linux/xtensa/setjmp.S b/libc/sysdeps/linux/xtensa/setjmp.S index 862bf67..b8152fd 100644 --- a/libc/sysdeps/linux/xtensa/setjmp.S +++ b/libc/sysdeps/linux/xtensa/setjmp.S @@ -122,7 +122,7 @@ ENTRY (__sigsetjmp) l32i a4, a6, 12 s32i a7, a5, 8 s32i a4, a5, 12 - addi a5, a6, 16 + addi a5, a5, 16 addi a6, a6, 16 blt a6, a8, .Lsjloop .Lendsj: diff --git a/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h b/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h index 2b877f9..fc17e9b 100644 --- a/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h +++ b/libpthread/linuxthreads.old/sysdeps/arm/pt-machine.h @@ -28,8 +28,7 @@ # define PT_EI __extern_always_inline #endif

-#if defined(__thumb__) -#if defined(__USE_LDREXSTREX__) +#if defined(__thumb2__) PT_EI long int ldrex(int *spinlock) { long int ret; @@ -63,7 +62,7 @@ testandset (int *spinlock) return ret; }

-#else /* __USE_LDREXSTREX__ */ +#elif defined(__thumb__)

/* 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 @@ -88,7 +87,7 @@ PT_EI long int testandset (int *spinlock) : "0"(1), "r"(spinlock)); return ret; } -#endif + #else /* __thumb__ */

PT_EI long int testandset (int *spinlock);

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