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ArmPkg RVCT: add ADRL/LDRL macro equivalents 

The GCC ARM builds have access to ADRL/LDRL macros that emit relative
symbol references, i.e., references that do not require fixing up at
load time (or FV generation time for XIP modules)

Implement equivalent functionality for RVCT: note that this does not
use movw/movt pairs, but the more compatible add/add/add or add/add/ldr
sequences (which Clang does not support, unfortunately, hence the use
of movw/movt for the GCC toolchain family)

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
This commit is contained in:
Ard Biesheuvel 2016-10-28 12:36:19 +01:00
parent c44f9a42d4
commit 4101c8753f
1 changed files with 20 additions and 0 deletions
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20
ArmPkg/Include/AsmMacroIoLib.inc
View File

@ -26,4 +26,24 @@
ldr $Reg, =($Data)
MEND
MACRO
adrll $Reg, $Symbol
add $Reg, pc, #-8
RELOC R_ARM_ALU_PC_G0_NC, $Symbol
add $Reg, $Reg, #-4
RELOC R_ARM_ALU_PC_G1_NC, $Symbol
add $Reg, $Reg, #0
RELOC R_ARM_ALU_PC_G2, $Symbol
MEND
MACRO
ldrl $Reg, $Symbol
add $Reg, pc, #-8
RELOC R_ARM_ALU_PC_G0_NC, $Symbol
add $Reg, $Reg, #-4
RELOC R_ARM_ALU_PC_G1_NC, $Symbol
ldr $Reg, [$Reg, #0]
RELOC R_ARM_LDR_PC_G2, $Symbol
MEND
END