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| author | Kevin Hao <haokexin@gmail.com> | 2013-06-27 05:09:43 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-07-01 05:10:34 +0400 |
| commit | 348c2298a6fd2b145e789739808d5e7598e275fc (patch) | |
| tree | 987f8ab221d1a3172212605b4f17dc4e8da7485d /arch/powerpc/kernel/reloc_32.S | |
| parent | 4bb297113433048169c30a32c1e58b6a1b61b621 (diff) | |
| download | linux-348c2298a6fd2b145e789739808d5e7598e275fc.tar.xz | |
powerpc: Don't flush/invalidate the d/icache for an unknown relocation type
For an unknown relocation type since the value of r4 is just the 8bit
relocation type, the sum of r4 and r7 may yield an invalid memory
address. For example:
In normal case:
r4 = c00xxxxx
r7 = 40000000
r4 + r7 = 000xxxxx
For an unknown relocation type:
r4 = 000000xx
r7 = 40000000
r4 + r7 = 400000xx
400000xx is an invalid memory address for a board which has just
512M memory.
And for operations such as dcbst or icbi may cause bus error for an
invalid memory address on some platforms and then cause the board
reset. So we should skip the flush/invalidate the d/icache for
an unknown relocation type.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Acked-by: Suzuki K. Poulose <suzuki@in.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/reloc_32.S')
| -rw-r--r-- | arch/powerpc/kernel/reloc_32.S | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/reloc_32.S b/arch/powerpc/kernel/reloc_32.S index ef46ba6e094f..f366fedb0872 100644 --- a/arch/powerpc/kernel/reloc_32.S +++ b/arch/powerpc/kernel/reloc_32.S @@ -166,7 +166,7 @@ ha16: /* R_PPC_ADDR16_LO */ lo16: cmpwi r4, R_PPC_ADDR16_LO - bne nxtrela + bne unknown_type lwz r4, 0(r9) /* r_offset */ lwz r0, 8(r9) /* r_addend */ add r0, r0, r3 @@ -191,6 +191,7 @@ nxtrela: dcbst r4,r7 sync /* Ensure the data is flushed before icbi */ icbi r4,r7 +unknown_type: cmpwi r8, 0 /* relasz = 0 ? */ ble done add r9, r9, r6 /* move to next entry in the .rela table */ |