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-rw-r--r--arch/arm/probes/decode.h26
-rw-r--r--arch/arm/probes/kprobes/Makefile3
-rw-r--r--arch/arm/probes/kprobes/actions-common.c8
-rw-r--r--arch/arm/probes/kprobes/actions-thumb.c16
4 files changed, 21 insertions, 32 deletions
diff --git a/arch/arm/probes/decode.h b/arch/arm/probes/decode.h
index 973173598992..facc889d05ee 100644
--- a/arch/arm/probes/decode.h
+++ b/arch/arm/probes/decode.h
@@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/stddef.h>
#include <asm/probes.h>
+#include <asm/ptrace.h>
#include <asm/kprobes.h>
void __init arm_probes_decode_init(void);
@@ -35,31 +36,6 @@ void __init find_str_pc_offset(void);
#endif
-/*
- * Update ITSTATE after normal execution of an IT block instruction.
- *
- * The 8 IT state bits are split into two parts in CPSR:
- * ITSTATE<1:0> are in CPSR<26:25>
- * ITSTATE<7:2> are in CPSR<15:10>
- */
-static inline unsigned long it_advance(unsigned long cpsr)
- {
- if ((cpsr & 0x06000400) == 0) {
- /* ITSTATE<2:0> == 0 means end of IT block, so clear IT state */
- cpsr &= ~PSR_IT_MASK;
- } else {
- /* We need to shift left ITSTATE<4:0> */
- const unsigned long mask = 0x06001c00; /* Mask ITSTATE<4:0> */
- unsigned long it = cpsr & mask;
- it <<= 1;
- it |= it >> (27 - 10); /* Carry ITSTATE<2> to correct place */
- it &= mask;
- cpsr &= ~mask;
- cpsr |= it;
- }
- return cpsr;
-}
-
static inline void __kprobes bx_write_pc(long pcv, struct pt_regs *regs)
{
long cpsr = regs->ARM_cpsr;
diff --git a/arch/arm/probes/kprobes/Makefile b/arch/arm/probes/kprobes/Makefile
index 14db56f49f0a..6159010dac4a 100644
--- a/arch/arm/probes/kprobes/Makefile
+++ b/arch/arm/probes/kprobes/Makefile
@@ -1,4 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
+KASAN_SANITIZE_actions-common.o := n
+KASAN_SANITIZE_actions-arm.o := n
+KASAN_SANITIZE_actions-thumb.o := n
obj-$(CONFIG_KPROBES) += core.o actions-common.o checkers-common.o
obj-$(CONFIG_ARM_KPROBES_TEST) += test-kprobes.o
test-kprobes-objs := test-core.o
diff --git a/arch/arm/probes/kprobes/actions-common.c b/arch/arm/probes/kprobes/actions-common.c
index 836aebe596cd..79171344dbeb 100644
--- a/arch/arm/probes/kprobes/actions-common.c
+++ b/arch/arm/probes/kprobes/actions-common.c
@@ -84,7 +84,8 @@ emulate_generic_r0_12_noflags(probes_opcode_t insn,
register void *rfn asm("lr") = asi->insn_fn;
__asm__ __volatile__ (
- "stmdb sp!, {%[regs], r11} \n\t"
+ARM( "stmdb sp!, {%[regs], r11} \n\t" )
+THUMB( "stmdb sp!, {%[regs], r7} \n\t" )
"ldmia %[regs], {r0-r12} \n\t"
#if __LINUX_ARM_ARCH__ >= 6
"blx %[fn] \n\t"
@@ -96,10 +97,11 @@ emulate_generic_r0_12_noflags(probes_opcode_t insn,
#endif
"ldr lr, [sp], #4 \n\t" /* lr = regs */
"stmia lr, {r0-r12} \n\t"
- "ldr r11, [sp], #4 \n\t"
+ARM( "ldr r11, [sp], #4 \n\t" )
+THUMB( "ldr r7, [sp], #4 \n\t" )
: [regs] "=r" (rregs), [fn] "=r" (rfn)
: "0" (rregs), "1" (rfn)
- : "r0", "r2", "r3", "r4", "r5", "r6", "r7",
+ : "r0", "r2", "r3", "r4", "r5", "r6", ARM("r7") THUMB("r11"),
"r8", "r9", "r10", "r12", "memory", "cc"
);
}
diff --git a/arch/arm/probes/kprobes/actions-thumb.c b/arch/arm/probes/kprobes/actions-thumb.c
index 7884fcb81c26..51624fc263fc 100644
--- a/arch/arm/probes/kprobes/actions-thumb.c
+++ b/arch/arm/probes/kprobes/actions-thumb.c
@@ -447,14 +447,16 @@ t16_emulate_loregs(probes_opcode_t insn,
__asm__ __volatile__ (
"msr cpsr_fs, %[oldcpsr] \n\t"
+ "mov r11, r7 \n\t"
"ldmia %[regs], {r0-r7} \n\t"
"blx %[fn] \n\t"
"stmia %[regs], {r0-r7} \n\t"
+ "mov r7, r11 \n\t"
"mrs %[newcpsr], cpsr \n\t"
: [newcpsr] "=r" (newcpsr)
: [oldcpsr] "r" (oldcpsr), [regs] "r" (regs),
[fn] "r" (asi->insn_fn)
- : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+ : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r11",
"lr", "memory", "cc"
);
@@ -524,14 +526,16 @@ t16_emulate_push(probes_opcode_t insn,
struct arch_probes_insn *asi, struct pt_regs *regs)
{
__asm__ __volatile__ (
+ "mov r11, r7 \n\t"
"ldr r9, [%[regs], #13*4] \n\t"
"ldr r8, [%[regs], #14*4] \n\t"
"ldmia %[regs], {r0-r7} \n\t"
"blx %[fn] \n\t"
"str r9, [%[regs], #13*4] \n\t"
+ "mov r7, r11 \n\t"
:
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
- : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9",
+ : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r8", "r9", "r11",
"lr", "memory", "cc"
);
}
@@ -558,14 +562,16 @@ t16_emulate_pop_nopc(probes_opcode_t insn,
struct arch_probes_insn *asi, struct pt_regs *regs)
{
__asm__ __volatile__ (
+ "mov r11, r7 \n\t"
"ldr r9, [%[regs], #13*4] \n\t"
"ldmia %[regs], {r0-r7} \n\t"
"blx %[fn] \n\t"
"stmia %[regs], {r0-r7} \n\t"
"str r9, [%[regs], #13*4] \n\t"
+ "mov r7, r11 \n\t"
:
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
- : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
+ : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r9", "r11",
"lr", "memory", "cc"
);
}
@@ -577,14 +583,16 @@ t16_emulate_pop_pc(probes_opcode_t insn,
register unsigned long pc asm("r8");
__asm__ __volatile__ (
+ "mov r11, r7 \n\t"
"ldr r9, [%[regs], #13*4] \n\t"
"ldmia %[regs], {r0-r7} \n\t"
"blx %[fn] \n\t"
"stmia %[regs], {r0-r7} \n\t"
"str r9, [%[regs], #13*4] \n\t"
+ "mov r7, r11 \n\t"
: "=r" (pc)
: [regs] "r" (regs), [fn] "r" (asi->insn_fn)
- : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r9",
+ : "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r9", "r11",
"lr", "memory", "cc"
);
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