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| author | Gabor Juhos <juhosg@openwrt.org> | 2013-02-12 22:22:13 +0100 |
|---|---|---|
| committer | Daniel Schwierzeck <daniel.schwierzeck@gmail.com> | 2013-02-12 22:22:13 +0100 |
| commit | 04380c651a2ff0d1495822321d2b7668dcd02537 (patch) | |
| tree | fd763e5b4f62d349cbcfde50e5e24292f9a1a18f /arch/mips/cpu/mips32 | |
| parent | 0ba8926e08bdabba681384ba3ea8476eda68c141 (diff) | |
| download | u-boot-imx-04380c651a2ff0d1495822321d2b7668dcd02537.zip u-boot-imx-04380c651a2ff0d1495822321d2b7668dcd02537.tar.gz u-boot-imx-04380c651a2ff0d1495822321d2b7668dcd02537.tar.bz2 | |
MIPS: add dynamic relocation support
The code handles relocation entries with the
following relocation types only:
mips32: R_MIPS_REL32
mips64: R_MIPS_REL+R_MIPS_64
xburst: R_MIPS_REL32
Other relocation entries are skipped without
processing. The code must be extended if other
relocation types must be supported.
Add -pie to LDFLAGS_FINAL to generate the .rel.dyn
fixup table, which will be applied to the relocated
image before transferring control to it.
The CONFIG_NEEDS_MANUAL_RELOC is not needed
after the patch, so remove that as well.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Diffstat (limited to 'arch/mips/cpu/mips32')
| -rw-r--r-- | arch/mips/cpu/mips32/start.S | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/mips/cpu/mips32/start.S b/arch/mips/cpu/mips32/start.S index 649c0bb..76abbaa 100644 --- a/arch/mips/cpu/mips32/start.S +++ b/arch/mips/cpu/mips32/start.S @@ -201,6 +201,8 @@ relocate_code: jr t0 nop + .word __rel_dyn_end + .word __rel_dyn_start .word __image_copy_end .word _GLOBAL_OFFSET_TABLE_ .word num_got_entries @@ -227,6 +229,32 @@ in_ram: blt t2, t3, 1b addi t4, 4 + /* Update dynamic relocations */ + lw t1, -16(t0) # t1 <-- __rel_dyn_start + lw t2, -20(t0) # t2 <-- __rel_dyn_end + + b 2f # skip first reserved entry + addi t1, 8 + +1: + lw t3, -4(t1) # t3 <-- relocation info + + sub t3, 3 + bnez t3, 2f # skip non R_MIPS_REL32 entries + nop + + lw t3, -8(t1) # t3 <-- location to fix up in FLASH + + lw t4, 0(t3) # t4 <-- original pointer + add t4, s1 # t4 <-- adjusted pointer + + add t3, s1 # t3 <-- location to fix up in RAM + sw t4, 0(t3) + +2: + blt t1, t2, 1b + addi t1, 8 # each rel.dyn entry is 8 bytes + /* * Clear BSS * |