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ARM: use a function table for determining instruction interpreter action

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Make the instruction interpreter call back to semantic action functions
through a function pointer array provided by the invoker.  The interpreter
decodes the instructions into groups and uses the group number to index
into the supplied array.  kprobes and uprobes code will each supply their
own array of functions.

Signed-off-by: David A. Long <dave.long@linaro.org>
Acked-by: Jon Medhurst <tixy@linaro.org>
This commit is contained in:
David A. Long
2014-03-06 18:06:43 -05:00
parent 87abef63ea
commit 3e6cd394bb
11 changed files with 441 additions and 271 deletions
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9
arch/arm/kernel/probes.c
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@@ -381,7 +381,8 @@ static const int decode_struct_sizes[NUM_DECODE_TYPES] = {
*/
int __kprobes
kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi,
const union decode_item *table, bool thumb)
const union decode_item *table, bool thumb,
const union decode_action *actions)
{
const struct decode_header *h = (struct decode_header *)table;
const struct decode_header *next;
@@ -415,18 +416,18 @@ kprobe_decode_insn(kprobe_opcode_t insn, struct arch_specific_insn *asi,
case DECODE_TYPE_CUSTOM: {
struct decode_custom *d = (struct decode_custom *)h;
return (*d->decoder.decoder)(insn, asi);
return actions[d->decoder.action].decoder(insn, asi, h);
}
case DECODE_TYPE_SIMULATE: {
struct decode_simulate *d = (struct decode_simulate *)h;
asi->insn_handler = d->handler.handler;
asi->insn_handler = actions[d->handler.action].handler;
return INSN_GOOD_NO_SLOT;
}
case DECODE_TYPE_EMULATE: {
struct decode_emulate *d = (struct decode_emulate *)h;
asi->insn_handler = d->handler.handler;
asi->insn_handler = actions[d->handler.action].handler;
set_emulated_insn(insn, asi, thumb);
return INSN_GOOD;
}