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/lib/armlinux.c | |
| 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/lib/armlinux.c')
| -rw-r--r-- | arch/arm/lib/armlinux.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/arm/lib/armlinux.c b/arch/arm/lib/armlinux.c index 85fe2b9f66..a167036db5 100644 --- a/arch/arm/lib/armlinux.c +++ b/arch/arm/lib/armlinux.c @@ -255,6 +255,7 @@ void start_linux(void *adr, int swap, unsigned long initrd_address, { void (*kernel)(int zero, int arch, void *params) = adr; void *params = NULL; + int architecture; if (oftree) { printf("booting Linux kernel with devicetree\n"); @@ -272,5 +273,19 @@ void start_linux(void *adr, int swap, unsigned long initrd_address, __asm__ __volatile__("mcr p15, 0, %0, c1, c0" :: "r" (reg)); } - kernel(0, armlinux_get_architecture(), params); + architecture = armlinux_get_architecture(); + +#ifdef CONFIG_THUMB2_BAREBOX + __asm__ __volatile__ ( + "mov r0, #0\n" + "mov r1, %0\n" + "mov r2, %1\n" + "bx %2\n" + : + : "r" (architecture), "r" (params), "r" (kernel) + : "r0", "r1", "r2" + ); +#else + kernel(0, architecture, params); +#endif } |