sh: kprobes SMP support.
Presently kprobes support relies on several saved opcode variables for saving and restoring state, without any specific locking. This is inherently racy on SMP, and given that we already use per-CPU variables for everything else, convert these over too. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
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da28c59799
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@ -20,9 +20,9 @@
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DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
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DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
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static struct kprobe saved_current_opcode;
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static struct kprobe saved_next_opcode;
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static struct kprobe saved_next_opcode2;
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static DEFINE_PER_CPU(struct kprobe, saved_current_opcode);
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static DEFINE_PER_CPU(struct kprobe, saved_next_opcode);
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static DEFINE_PER_CPU(struct kprobe, saved_next_opcode2);
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#define OPCODE_JMP(x) (((x) & 0xF0FF) == 0x402b)
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#define OPCODE_JSR(x) (((x) & 0xF0FF) == 0x400b)
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@ -102,16 +102,21 @@ int __kprobes kprobe_handle_illslot(unsigned long pc)
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void __kprobes arch_remove_kprobe(struct kprobe *p)
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{
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if (saved_next_opcode.addr != 0x0) {
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arch_disarm_kprobe(p);
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arch_disarm_kprobe(&saved_next_opcode);
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saved_next_opcode.addr = 0x0;
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saved_next_opcode.opcode = 0x0;
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struct kprobe *saved = &__get_cpu_var(saved_next_opcode);
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if (saved_next_opcode2.addr != 0x0) {
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arch_disarm_kprobe(&saved_next_opcode2);
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saved_next_opcode2.addr = 0x0;
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saved_next_opcode2.opcode = 0x0;
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if (saved->addr) {
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arch_disarm_kprobe(p);
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arch_disarm_kprobe(saved);
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saved->addr = NULL;
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saved->opcode = 0;
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saved = &__get_cpu_var(saved_next_opcode2);
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if (saved->addr) {
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arch_disarm_kprobe(saved);
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saved->addr = NULL;
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saved->opcode = 0;
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}
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}
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}
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@ -141,57 +146,59 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
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*/
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static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs)
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{
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kprobe_opcode_t *addr = NULL;
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saved_current_opcode.addr = (kprobe_opcode_t *) (regs->pc);
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addr = saved_current_opcode.addr;
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__get_cpu_var(saved_current_opcode).addr = (kprobe_opcode_t *)regs->pc;
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if (p != NULL) {
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struct kprobe *op1, *op2;
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arch_disarm_kprobe(p);
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op1 = &__get_cpu_var(saved_next_opcode);
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op2 = &__get_cpu_var(saved_next_opcode2);
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if (OPCODE_JSR(p->opcode) || OPCODE_JMP(p->opcode)) {
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unsigned int reg_nr = ((p->opcode >> 8) & 0x000F);
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saved_next_opcode.addr =
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(kprobe_opcode_t *) regs->regs[reg_nr];
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op1->addr = (kprobe_opcode_t *) regs->regs[reg_nr];
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} else if (OPCODE_BRA(p->opcode) || OPCODE_BSR(p->opcode)) {
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unsigned long disp = (p->opcode & 0x0FFF);
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saved_next_opcode.addr =
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op1->addr =
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(kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
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} else if (OPCODE_BRAF(p->opcode) || OPCODE_BSRF(p->opcode)) {
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unsigned int reg_nr = ((p->opcode >> 8) & 0x000F);
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saved_next_opcode.addr =
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op1->addr =
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(kprobe_opcode_t *) (regs->pc + 4 +
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regs->regs[reg_nr]);
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} else if (OPCODE_RTS(p->opcode)) {
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saved_next_opcode.addr = (kprobe_opcode_t *) regs->pr;
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op1->addr = (kprobe_opcode_t *) regs->pr;
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} else if (OPCODE_BF(p->opcode) || OPCODE_BT(p->opcode)) {
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unsigned long disp = (p->opcode & 0x00FF);
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/* case 1 */
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saved_next_opcode.addr = p->addr + 1;
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op1->addr = p->addr + 1;
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/* case 2 */
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saved_next_opcode2.addr =
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op2->addr =
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(kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
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saved_next_opcode2.opcode = *(saved_next_opcode2.addr);
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arch_arm_kprobe(&saved_next_opcode2);
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op2->opcode = *(op2->addr);
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arch_arm_kprobe(op2);
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} else if (OPCODE_BF_S(p->opcode) || OPCODE_BT_S(p->opcode)) {
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unsigned long disp = (p->opcode & 0x00FF);
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/* case 1 */
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saved_next_opcode.addr = p->addr + 2;
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op1->addr = p->addr + 2;
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/* case 2 */
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saved_next_opcode2.addr =
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op2->addr =
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(kprobe_opcode_t *) (regs->pc + 4 + disp * 2);
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saved_next_opcode2.opcode = *(saved_next_opcode2.addr);
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arch_arm_kprobe(&saved_next_opcode2);
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op2->opcode = *(op2->addr);
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arch_arm_kprobe(op2);
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} else {
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saved_next_opcode.addr = p->addr + 1;
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op1->addr = p->addr + 1;
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}
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saved_next_opcode.opcode = *(saved_next_opcode.addr);
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arch_arm_kprobe(&saved_next_opcode);
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op1->opcode = *(op1->addr);
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arch_arm_kprobe(op1);
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}
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}
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@ -376,21 +383,23 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs)
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cur->post_handler(cur, regs, 0);
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}
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if (saved_next_opcode.addr != 0x0) {
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arch_disarm_kprobe(&saved_next_opcode);
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saved_next_opcode.addr = 0x0;
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saved_next_opcode.opcode = 0x0;
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p = &__get_cpu_var(saved_next_opcode);
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if (p->addr) {
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arch_disarm_kprobe(p);
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p->addr = NULL;
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p->opcode = 0;
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addr = saved_current_opcode.addr;
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saved_current_opcode.addr = 0x0;
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addr = __get_cpu_var(saved_current_opcode).addr;
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__get_cpu_var(saved_current_opcode).addr = NULL;
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p = get_kprobe(addr);
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arch_arm_kprobe(p);
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if (saved_next_opcode2.addr != 0x0) {
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arch_disarm_kprobe(&saved_next_opcode2);
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saved_next_opcode2.addr = 0x0;
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saved_next_opcode2.opcode = 0x0;
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p = &__get_cpu_var(saved_next_opcode2);
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if (p->addr) {
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arch_disarm_kprobe(p);
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p->addr = NULL;
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p->opcode = 0;
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}
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}
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@ -572,14 +581,5 @@ static struct kprobe trampoline_p = {
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int __init arch_init_kprobes(void)
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{
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saved_next_opcode.addr = 0x0;
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saved_next_opcode.opcode = 0x0;
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saved_current_opcode.addr = 0x0;
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saved_current_opcode.opcode = 0x0;
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saved_next_opcode2.addr = 0x0;
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saved_next_opcode2.opcode = 0x0;
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return register_kprobe(&trampoline_p);
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}
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