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Diffstat (limited to 'arch/arm/kernel/kprobes-arm.c')
-rw-r--r--arch/arm/kernel/kprobes-arm.c63
1 files changed, 60 insertions, 3 deletions
diff --git a/arch/arm/kernel/kprobes-arm.c b/arch/arm/kernel/kprobes-arm.c
index bb38ae3601c8..d252e7821fcc 100644
--- a/arch/arm/kernel/kprobes-arm.c
+++ b/arch/arm/kernel/kprobes-arm.c
@@ -502,7 +502,7 @@ static void __kprobes emulate_strd(struct kprobe *p, struct pt_regs *regs)
regs->uregs[rn] = rnv_wb;
}
-static void __kprobes emulate_ldr(struct kprobe *p, struct pt_regs *regs)
+static void __kprobes emulate_ldr_old(struct kprobe *p, struct pt_regs *regs)
{
insn_llret_3arg_fn_t *i_fn = (insn_llret_3arg_fn_t *)&p->ainsn.insn[0];
kprobe_opcode_t insn = p->opcode;
@@ -535,7 +535,7 @@ static void __kprobes emulate_ldr(struct kprobe *p, struct pt_regs *regs)
regs->uregs[rd] = rdv;
}
-static void __kprobes emulate_str(struct kprobe *p, struct pt_regs *regs)
+static void __kprobes emulate_str_old(struct kprobe *p, struct pt_regs *regs)
{
insn_3arg_fn_t *i_fn = (insn_3arg_fn_t *)&p->ainsn.insn[0];
kprobe_opcode_t insn = p->opcode;
@@ -795,7 +795,7 @@ prep_emulate_ldr_str(kprobe_opcode_t insn, struct arch_specific_insn *asi)
insn |= 2; /* Rm = r2 */
}
asi->insn[0] = insn;
- asi->insn_handler = (insn & (1 << 20)) ? emulate_ldr : emulate_str;
+ asi->insn_handler = (insn & (1 << 20)) ? emulate_ldr_old : emulate_str_old;
return INSN_GOOD;
}
@@ -923,6 +923,63 @@ emulate_ldrdstrd(struct kprobe *p, struct pt_regs *regs)
}
static void __kprobes
+emulate_ldr(struct kprobe *p, struct pt_regs *regs)
+{
+ kprobe_opcode_t insn = p->opcode;
+ unsigned long pc = (unsigned long)p->addr + 8;
+ int rt = (insn >> 12) & 0xf;
+ int rn = (insn >> 16) & 0xf;
+ int rm = insn & 0xf;
+
+ register unsigned long rtv asm("r0");
+ register unsigned long rnv asm("r2") = (rn == 15) ? pc
+ : regs->uregs[rn];
+ register unsigned long rmv asm("r3") = regs->uregs[rm];
+
+ __asm__ __volatile__ (
+ BLX("%[fn]")
+ : "=r" (rtv), "=r" (rnv)
+ : "1" (rnv), "r" (rmv), [fn] "r" (p->ainsn.insn_fn)
+ : "lr", "memory", "cc"
+ );
+
+ if (rt == 15)
+ load_write_pc(rtv, regs);
+ else
+ regs->uregs[rt] = rtv;
+
+ if (is_writeback(insn))
+ regs->uregs[rn] = rnv;
+}
+
+static void __kprobes
+emulate_str(struct kprobe *p, struct pt_regs *regs)
+{
+ kprobe_opcode_t insn = p->opcode;
+ unsigned long rtpc = (unsigned long)p->addr + str_pc_offset;
+ unsigned long rnpc = (unsigned long)p->addr + 8;
+ int rt = (insn >> 12) & 0xf;
+ int rn = (insn >> 16) & 0xf;
+ int rm = insn & 0xf;
+
+ register unsigned long rtv asm("r0") = (rt == 15) ? rtpc
+ : regs->uregs[rt];
+ register unsigned long rnv asm("r2") = (rn == 15) ? rnpc
+ : regs->uregs[rn];
+ register unsigned long rmv asm("r3") = regs->uregs[rm];
+
+ __asm__ __volatile__ (
+ BLX("%[fn]")
+ : "=r" (rnv)
+ : "r" (rtv), "0" (rnv), "r" (rmv), [fn] "r" (p->ainsn.insn_fn)
+ : "lr", "memory", "cc"
+ );
+
+ if (is_writeback(insn))
+ regs->uregs[rn] = rnv;
+}
+
+static void __kprobes
emulate_rd12rn16rm0rs8_rwflags(struct kprobe *p, struct pt_regs *regs)
{
kprobe_opcode_t insn = p->opcode;