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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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6
arch/powerpc/include/asm/ppc_asm.h
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@ -785,9 +785,9 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
*/
#define EX_TABLE(_fault, _target) \
stringify_in_c(.section __ex_table,"a";)\
PPC_LONG_ALIGN stringify_in_c(;) \
PPC_LONG stringify_in_c(_fault;) \
PPC_LONG stringify_in_c(_target;) \
stringify_in_c(.balign 4;) \
stringify_in_c(.long (_fault) - . ;) \
stringify_in_c(.long (_target) - . ;) \
stringify_in_c(.previous)
#endif /* _ASM_POWERPC_PPC_ASM_H */

27
arch/powerpc/include/asm/uaccess.h
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@ -64,23 +64,30 @@
__access_ok((__force unsigned long)(addr), (size), get_fs()))
/*
* The exception table consists of pairs of addresses: the first is the
* address of an instruction that is allowed to fault, and the second is
* The exception table consists of pairs of relative addresses: the first is
* the address of an instruction that is allowed to fault, and the second is
* the address at which the program should continue. No registers are
* modified, so it is entirely up to the continuation code to figure out
* what to do.
* modified, so it is entirely up to the continuation code to figure out what
* to do.
*
* All the routines below use bits of fixup code that are out of line
* with the main instruction path. This means when everything is well,
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
* All the routines below use bits of fixup code that are out of line with the
* main instruction path. This means when everything is well, we don't even
* have to jump over them. Further, they do not intrude on our cache or tlb
* entries.
*/
#define ARCH_HAS_RELATIVE_EXTABLE
struct exception_table_entry {
unsigned long insn;
unsigned long fixup;
int insn;
int fixup;
};
static inline unsigned long extable_fixup(const struct exception_table_entry *x)
{
return (unsigned long)&x->fixup + x->fixup;
}
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.

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
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@ -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;
}
}

2
arch/powerpc/mm/fault.c
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@ -512,7 +512,7 @@ void bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
/* Are we prepared to handle this fault? */
if ((entry = search_exception_tables(regs->nip)) != NULL) {
regs->nip = entry->fixup;
regs->nip = extable_fixup(entry);
return;
}

2
arch/powerpc/platforms/embedded6xx/holly.c
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@ -263,7 +263,7 @@ static int ppc750_machine_check_exception(struct pt_regs *regs)
if ((entry = search_exception_tables(regs->nip)) != NULL) {
tsi108_clear_pci_cfg_error();
regs->msr |= MSR_RI;
regs->nip = entry->fixup;
regs->nip = extable_fixup(entry);
return 1;
}
return 0;

2
arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
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@ -174,7 +174,7 @@ static int mpc7448_machine_check_exception(struct pt_regs *regs)
if ((entry = search_exception_tables(regs->nip)) != NULL) {
tsi108_clear_pci_cfg_error();
regs->msr |= MSR_RI;
regs->nip = entry->fixup;
regs->nip = extable_fixup(entry);
return 1;
}
return 0;

2
arch/powerpc/sysdev/fsl_rio.c
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@ -111,7 +111,7 @@ int fsl_rio_mcheck_exception(struct pt_regs *regs)
out_be32((u32 *)(rio_regs_win + RIO_LTLEDCSR),
0);
regs->msr |= MSR_RI;
regs->nip = entry->fixup;
regs->nip = extable_fixup(entry);
return 1;
}
}

12
tools/testing/selftests/powerpc/primitives/load_unaligned_zeropad.c
View File

@ -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;