From d47cb0b61aa9e268f140455b2bc4421ae9e0b4bc Mon Sep 17 00:00:00 2001 From: Peng Fan Date: Fri, 23 Oct 2015 10:13:03 +0800 Subject: [PATCH] arm: discard relocation entries for secure text The code such as PSCI in section named secure is bundled with u-boot image, and when bootm, the code will be copied to their runtime address same to compliation/linking address - CONFIG_ARMV7_SECURE_BASE. When compile the PSCI code and link it into the u-boot image, there will be relocation entries in .rel.dyn section for PSCI. Actually, we do not needs these relocation entries. If still keep the relocation entries in .rel.dyn section, r0 at line 103 and 106 in arch/arm/lib/relocate.S may be an invalid address which may not support read/write for one SoC. 102 /* relative fix: increase location by offset */ 103 add r0, r0, r4 104 ldr r1, [r0] 105 add r1, r1, r4 106 str r1, [r0] So discard them to avoid touching the relocation entry in arch/arm/lib/relocate.S. Signed-off-by: Peng Fan Cc: Tom Warren Cc: York Sun Cc: Hans De Goede Cc: Ian Campbell Cc: Albert Aribaud Cc: Tom Rini Cc: Jan Kiszka Cc: Stefano Babic Acked-by: Albert ARIBAUD --- arch/arm/cpu/u-boot.lds | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/arm/cpu/u-boot.lds b/arch/arm/cpu/u-boot.lds index 03cd9f60f9..d48a905cf3 100644 --- a/arch/arm/cpu/u-boot.lds +++ b/arch/arm/cpu/u-boot.lds @@ -14,6 +14,23 @@ OUTPUT_ARCH(arm) ENTRY(_start) SECTIONS { + /* + * Discard the relocation entries for secure text. + * The secure code is bundled with u-boot image, so there will + * be relocations entries for the secure code, since we use + * "-mword-relocations" to compile and "-pie" to link into the + * final image. We do not need the relocation entries for secure + * code, because secure code will not be relocated, it only needs + * to be copied from loading address to CONFIG_ARMV7_SECURE_BASE, + * which is the linking and running address for secure code. + * If keep the relocation entries in .rel.dyn section, + * "relocation offset + linking address" may locates into an + * address that is reserved by SoC, then will trigger data abort. + * + * The reason that move .rel._secure at the beginning, is to + * avoid hole in the final image. + */ + /DISCARD/ : { *(.rel._secure*) } . = 0x00000000; . = ALIGN(4);