Commit 2dacab73 authored by Matthew Leach's avatar Matthew Leach Committed by Catalin Marinas
Browse files

arm64: debug: make aarch32 bkpt checking endian clean



The current breakpoint instruction checking code for A32 is not endian
clean. Fix this with appropriate byte-swapping when retrieving
instructions.
Signed-off-by: default avatarMatthew Leach <matthew.leach@arm.com>
Reviewed-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 6a2e5e52
......@@ -248,7 +248,8 @@ static int brk_handler(unsigned long addr, unsigned int esr,
int aarch32_break_handler(struct pt_regs *regs)
{
siginfo_t info;
unsigned int instr;
u32 arm_instr;
u16 thumb_instr;
bool bp = false;
void __user *pc = (void __user *)instruction_pointer(regs);
......@@ -257,18 +258,21 @@ int aarch32_break_handler(struct pt_regs *regs)
if (compat_thumb_mode(regs)) {
/* get 16-bit Thumb instruction */
get_user(instr, (u16 __user *)pc);
if (instr == AARCH32_BREAK_THUMB2_LO) {
get_user(thumb_instr, (u16 __user *)pc);
thumb_instr = le16_to_cpu(thumb_instr);
if (thumb_instr == AARCH32_BREAK_THUMB2_LO) {
/* get second half of 32-bit Thumb-2 instruction */
get_user(instr, (u16 __user *)(pc + 2));
bp = instr == AARCH32_BREAK_THUMB2_HI;
get_user(thumb_instr, (u16 __user *)(pc + 2));
thumb_instr = le16_to_cpu(thumb_instr);
bp = thumb_instr == AARCH32_BREAK_THUMB2_HI;
} else {
bp = instr == AARCH32_BREAK_THUMB;
bp = thumb_instr == AARCH32_BREAK_THUMB;
}
} else {
/* 32-bit ARM instruction */
get_user(instr, (u32 __user *)pc);
bp = (instr & ~0xf0000000) == AARCH32_BREAK_ARM;
get_user(arm_instr, (u32 __user *)pc);
arm_instr = le32_to_cpu(arm_instr);
bp = (arm_instr & ~0xf0000000) == AARCH32_BREAK_ARM;
}
if (!bp)
......
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