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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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12
tools/testing/selftests/powerpc/primitives/load_unaligned_zeropad.c
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@@ -73,19 +73,23 @@ extern char __stop___ex_table[];
#error implement UCONTEXT_NIA
#endif
struct extbl_entry {
int insn;
int fixup;
};
static void segv_handler(int signr, siginfo_t *info, void *ptr)
{
ucontext_t *uc = (ucontext_t *)ptr;
unsigned long addr = (unsigned long)info->si_addr;
unsigned long *ip = &UCONTEXT_NIA(uc);
unsigned long *ex_p = (unsigned long *)__start___ex_table;
struct extbl_entry *entry = (struct extbl_entry *)__start___ex_table;
while (ex_p < (unsigned long *)__stop___ex_table) {
while (entry < (struct extbl_entry *)__stop___ex_table) {
unsigned long insn, fixup;
insn = *ex_p++;
fixup = *ex_p++;
insn = (unsigned long)&entry->insn + entry->insn;
fixup = (unsigned long)&entry->fixup + entry->fixup;
if (insn == *ip) {
*ip = fixup;