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MIPS: BREAK instruction interpretation corrections 

Add the missing microMIPS BREAK16 instruction code interpretation and
reshape code removing instruction fetching duplication and the separate
call to `do_trap_or_bp' in the MIPS16 path.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9696/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Maciej W. Rozycki 2015-04-03 23:26:27 +01:00 committed by Ralf Baechle
parent 68893e0051
commit f6a31da501
1 changed files with 18 additions and 18 deletions
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36
arch/mips/kernel/traps.c
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@ -901,10 +901,9 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
asmlinkage void do_bp(struct pt_regs *regs)
{
unsigned long epc = msk_isa16_mode(exception_epc(regs));
unsigned int opcode, bcode;
enum ctx_state prev_state;
unsigned long epc;
u16 instr[2];
mm_segment_t seg;
seg = get_fs();
@ -913,26 +912,28 @@ asmlinkage void do_bp(struct pt_regs *regs)
prev_state = exception_enter();
if (get_isa16_mode(regs->cp0_epc)) {
/* Calculate EPC. */
epc = exception_epc(regs);
if (cpu_has_mmips) {
if ((__get_user(instr[0], (u16 __user *)msk_isa16_mode(epc)) ||
(__get_user(instr[1], (u16 __user *)msk_isa16_mode(epc + 2)))))
u16 instr[2];
if (__get_user(instr[0], (u16 __user *)epc))
goto out_sigsegv;
if (!cpu_has_mmips) {
/* MIPS16e mode */
bcode = (instr[0] >> 5) & 0x3f;
} else if (mm_insn_16bit(instr[0])) {
/* 16-bit microMIPS BREAK */
bcode = instr[0] & 0xf;
} else {
/* 32-bit microMIPS BREAK */
if (__get_user(instr[1], (u16 __user *)(epc + 2)))
goto out_sigsegv;
opcode = (instr[0] << 16) | instr[1];
} else {
/* MIPS16e mode */
if (__get_user(instr[0],
(u16 __user *)msk_isa16_mode(epc)))
goto out_sigsegv;
bcode = (instr[0] >> 5) & 0x3f;
do_trap_or_bp(regs, bcode, "Break");
goto out;
bcode = (opcode >> 6) & ((1 << 20) - 1);
}
} else {
if (__get_user(opcode,
(unsigned int __user *) exception_epc(regs)))
if (__get_user(opcode, (unsigned int __user *)epc))
goto out_sigsegv;
bcode = (opcode >> 6) & ((1 << 20) - 1);
}
/*
@ -941,7 +942,6 @@ asmlinkage void do_bp(struct pt_regs *regs)
* Gas is bug-compatible, but not always, grrr...
* We handle both cases with a simple heuristics. --macro
*/
bcode = ((opcode >> 6) & ((1 << 20) - 1));
if (bcode >= (1 << 10))
bcode >>= 10;