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powerpc: Add support for relative exception tables

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This halves the exception table size on 64-bit builds, and it allows
build-time sorting of exception tables to work on relocated kernels.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Minor asm fixups and bits to keep the selftests working]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2016-10-14 16:47:31 +11:00
committed by Michael Ellerman
parent 24bfa6a9e0
commit 61a92f7031
9 changed files with 34 additions and 23 deletions
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2
arch/powerpc/kernel/kprobes.c
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@@ -449,7 +449,7 @@ int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
* zero, try to fix up.
*/
if ((entry = search_exception_tables(regs->nip)) != NULL) {
regs->nip = entry->fixup;
regs->nip = extable_fixup(entry);
return 1;
}

2
arch/powerpc/kernel/traps.c
View File

@@ -365,7 +365,7 @@ static inline int check_io_access(struct pt_regs *regs)
(*nip & 0x100)? "OUT to": "IN from",
regs->gpr[rb] - _IO_BASE, nip);
regs->msr |= MSR_RI;
regs->nip = entry->fixup;
regs->nip = extable_fixup(entry);
return 1;
}
}