Commit d5355087 authored by Hunter Laux's avatar Hunter Laux Committed by Michael Tokarev
Browse files

Add support for the arm breakpoint syscall 

OABI arm used a software interrupt(0xef9f0001) for breakpoints.
Since 2005 gdb has used the break instruction(0xe7f001f0) for EABI.
Apparently Steel Bank Common Lisp still uses the swi instruction.

This is the kernel implementation:
http://lxr.free-electrons.com/source/arch/arm/kernel/traps.c#L598



Signed-off-by: default avatarHunter Laux <hunterlaux@gmail.com>
Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarMichael Tokarev <mjt@tls.msk.ru>
parent 5f22b054

linux-user/arm/syscall.h

+1 −0
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ struct target_pt_regs { 
#define ARM_THUMB_SYSCALL	0



#define ARM_NR_BASE	  0xf0000

#define ARM_NR_breakpoint (ARM_NR_BASE + 1)

#define ARM_NR_cacheflush (ARM_NR_BASE + 2)

#define ARM_NR_set_tls	  (ARM_NR_BASE + 5)

linux-user/main.c

+4 −0
Original line number Diff line number Diff line
@@ -806,6 +806,9 @@ void cpu_loop(CPUARMState *env) 
                            cpu_set_tls(env, env->regs[0]);

                            env->regs[0] = 0;

                            break;

                        case ARM_NR_breakpoint:

                            env->regs[15] -= env->thumb ? 2 : 4;

                            goto excp_debug;

                        default:

                            gemu_log("qemu: Unsupported ARM syscall: 0x%x\n",

                                     n);
@@ -849,6 +852,7 @@ void cpu_loop(CPUARMState *env) 
            }

            break;

        case EXCP_DEBUG:

        excp_debug:

            {

                int sig;