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| author | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2015-11-25 17:56:33 +0100 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-01-13 21:05:18 -0500 |
| commit | adc421e4cee8275cd99367b3b455ffbb5ead3990 (patch) | |
| tree | 08a51a4c9a9a6d5806d9f2c329065de3a5a7586e /arch | |
| parent | ecc306639e83c9019a5093b77a48685ea40eedc2 (diff) | |
| download | u-boot-imx-adc421e4cee8275cd99367b3b455ffbb5ead3990.zip u-boot-imx-adc421e4cee8275cd99367b3b455ffbb5ead3990.tar.gz u-boot-imx-adc421e4cee8275cd99367b3b455ffbb5ead3990.tar.bz2 | |
arm: move gd handling outside of C code
As of gcc 5.2.1 for Thumb-1, it is not possible any
more to assign gd from C code, as gd is mapped to r9,
and r9 may now be saved in the prolog sequence, and
restored in the epilog sequence, of any C functions.
Therefore arch_setup_gd(), which is supposed to set
r9, may actually have no effect, causing U-Boot to
use a bad address to access GD.
Fix this by never calling arch_setup_gd() for ARM,
and instead setting r9 in arch/arm/lib/crt0.S, to
the value returned by board_init_f_alloc_reserve().
Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/lib/crt0.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/lib/crt0.S b/arch/arm/lib/crt0.S index 4f2a712..2f4c14e 100644 --- a/arch/arm/lib/crt0.S +++ b/arch/arm/lib/crt0.S @@ -85,6 +85,8 @@ ENTRY(_main) mov r0, sp bl board_init_f_alloc_reserve mov sp, r0 + /* set up gd here, outside any C code */ + mov r9, r0 bl board_init_f_init_reserve mov r0, #0 @@ -134,6 +136,7 @@ here: bl spl_relocate_stack_gd cmp r0, #0 movne sp, r0 + movne r9, r0 # endif ldr r0, =__bss_start /* this is auto-relocated! */ |