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Fix BL2U entrypoint possible parameter corruption 

Replace the use of r12 by r10 to save the value of a parameter of
bl2u_entrypoint to pass it to bl2u_early_platform_setup at the end of
the function. r10 is a callee saved register so it will not become
corrupted by C code, whereas r12 is the The Intra-Procedure-call scratch
register potentially used by veneers. See the ARM AAPCS document (ARM
IHI 0042F).

Change-Id: I4f37e54a6b550719edb40bb24cd8f498827e2749
Signed-off-by: Douglas Raillard <douglas.raillard@arm.com>
This commit is contained in:
Douglas Raillard 2017-07-26 19:23:16 +01:00
parent 5e2cbb361e
commit 5c2c88b558
1 changed files with 2 additions and 2 deletions
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4
bl2u/aarch32/bl2u_entrypoint.S
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@ -32,7 +32,7 @@ func bl2u_entrypoint
* ---------------------------------------------
*/
mov r11, r1
mov r12, r2
mov r10, r2
/* ---------------------------------------------
* Set the exception vector to something sane.
@ -107,7 +107,7 @@ func bl2u_entrypoint
* ---------------------------------------------
*/
mov r0, r11
mov r1, r12
mov r1, r10
bl bl2u_early_platform_setup
bl bl2u_plat_arch_setup