diff options
| author | Sascha Hauer <s.hauer@pengutronix.de> | 2011-12-10 16:41:07 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2012-03-06 09:37:59 +0100 |
| commit | 104a6a7ccfb7928ca5dc28c8cbe0ea231ffc45ee (patch) | |
| tree | 9775e9211293396220d225d7a4746c3d06a837ec /arch/arm/include | |
| parent | cb1bd905dcacd8abd2703f6ce61fc09db8e475a4 (diff) | |
| download | barebox-104a6a7ccfb7928ca5dc28c8cbe0ea231ffc45ee.tar.gz barebox-104a6a7ccfb7928ca5dc28c8cbe0ea231ffc45ee.tar.xz | |
ARM: Allow to compile in thumb-2 mode
This shrinks the resulting binary size by ~25%. Exceptions
are still handled in arm mode, so we have to explicitely
put .arm directives into the exception code. Thumb-2 mode
has been tested on i.MX51 Babbage board.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/include')
| -rw-r--r-- | arch/arm/include/asm/barebox-arm-head.h | 12 | ||||
| -rw-r--r-- | arch/arm/include/asm/unified.h | 8 |
2 files changed, 16 insertions, 4 deletions
diff --git a/arch/arm/include/asm/barebox-arm-head.h b/arch/arm/include/asm/barebox-arm-head.h index fdbee8cdda..0dc3074a27 100644 --- a/arch/arm/include/asm/barebox-arm-head.h +++ b/arch/arm/include/asm/barebox-arm-head.h @@ -4,6 +4,17 @@ static inline void barebox_arm_head(void) { __asm__ __volatile__ ( +#ifdef CONFIG_THUMB2_BAREBOX + ".arm\n" + "adr r9, 1f + 1\n" + "bx r9\n" + ".thumb\n" + "1:\n" + "bl reset\n" + ".rept 10\n" + "1: b 1b\n" + ".endr\n" +#else "b reset\n" "1: b 1b\n" "1: b 1b\n" @@ -12,6 +23,7 @@ static inline void barebox_arm_head(void) "1: b 1b\n" "1: b 1b\n" "1: b 1b\n" +#endif ".word 0x65726162\n" /* 'bare' */ ".word 0x00786f62\n" /* 'box' */ ".word _text\n" /* text base. If copied there, diff --git a/arch/arm/include/asm/unified.h b/arch/arm/include/asm/unified.h index bc631161e9..4d855c8352 100644 --- a/arch/arm/include/asm/unified.h +++ b/arch/arm/include/asm/unified.h @@ -24,10 +24,10 @@ .syntax unified #endif -#ifdef CONFIG_THUMB2_KERNEL +#ifdef CONFIG_THUMB2_BAREBOX #if __GNUC__ < 4 -#error Thumb-2 kernel requires gcc >= 4 +#error Thumb-2 barebox requires gcc >= 4 #endif /* The CPSR bit describing the instruction set (Thumb) */ @@ -40,7 +40,7 @@ #endif #define BSYM(sym) sym + 1 -#else /* !CONFIG_THUMB2_KERNEL */ +#else /* !CONFIG_THUMB2_BAREBOX */ /* The CPSR bit describing the instruction set (ARM) */ #define PSR_ISETSTATE 0 @@ -52,7 +52,7 @@ #endif #define BSYM(sym) sym -#endif /* CONFIG_THUMB2_KERNEL */ +#endif /* CONFIG_THUMB2_BAREBOX */ #ifndef CONFIG_ARM_ASM_UNIFIED |