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: Matthew Leach <matthew.leach@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -248,7 +248,8 @@ static int brk_handler(unsigned long addr, unsigned int esr,
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int aarch32_break_handler(struct pt_regs *regs)
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{
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siginfo_t info;
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unsigned int instr;
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u32 arm_instr;
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u16 thumb_instr;
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bool bp = false;
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void __user *pc = (void __user *)instruction_pointer(regs);
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@ -257,18 +258,21 @@ int aarch32_break_handler(struct pt_regs *regs)
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if (compat_thumb_mode(regs)) {
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/* get 16-bit Thumb instruction */
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get_user(instr, (u16 __user *)pc);
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if (instr == AARCH32_BREAK_THUMB2_LO) {
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get_user(thumb_instr, (u16 __user *)pc);
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thumb_instr = le16_to_cpu(thumb_instr);
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if (thumb_instr == AARCH32_BREAK_THUMB2_LO) {
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/* get second half of 32-bit Thumb-2 instruction */
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get_user(instr, (u16 __user *)(pc + 2));
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bp = instr == AARCH32_BREAK_THUMB2_HI;
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get_user(thumb_instr, (u16 __user *)(pc + 2));
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thumb_instr = le16_to_cpu(thumb_instr);
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bp = thumb_instr == AARCH32_BREAK_THUMB2_HI;
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} else {
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bp = instr == AARCH32_BREAK_THUMB;
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bp = thumb_instr == AARCH32_BREAK_THUMB;
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}
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} else {
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/* 32-bit ARM instruction */
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get_user(instr, (u32 __user *)pc);
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bp = (instr & ~0xf0000000) == AARCH32_BREAK_ARM;
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get_user(arm_instr, (u32 __user *)pc);
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arm_instr = le32_to_cpu(arm_instr);
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bp = (arm_instr & ~0xf0000000) == AARCH32_BREAK_ARM;
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}
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if (!bp)
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