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platform_kernel-5.15
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openrisc: fix trap for debugger breakpoint signalling 

I have been working on getting native Linux GDB support working for the
OpenRISC port.  The trap signal handler here was wrong in a few ways.
During trap handling address (from the EEAR register) is not set by the
CPU, so it is not correct to use here.  We want to use trap as a
break-point so use TRAP_BRKPT.  Adding 4 to the pc was incorrect and
causing GDB to think the breakpoint was not hit.

Fixing these allows GDB to work now.

Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Stafford Horne 2020-10-18 06:37:01 +09:00
parent f81cc5ac8c
commit 28b852b1dc
1 changed files with 1 additions and 3 deletions
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4
arch/openrisc/kernel/traps.c
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@ -238,9 +238,7 @@ void __init trap_init(void)
asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
{
force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address);
regs->pc += 4;
force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
}
asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)