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Add support for the arm breakpoint syscall

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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: Hunter Laux <hunterlaux@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Hunter Laux 2014-06-20 04:13:14 -07:00 committed by Michael Tokarev
parent 5f22b054f2
commit d535508793
2 changed files with 5 additions and 0 deletions
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1
linux-user/arm/syscall.h
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@ -29,6 +29,7 @@ struct target_pt_regs {
#define ARM_THUMB_SYSCALL 0 #define ARM_THUMB_SYSCALL 0
#define ARM_NR_BASE 0xf0000 #define ARM_NR_BASE 0xf0000
#define ARM_NR_breakpoint (ARM_NR_BASE + 1)
#define ARM_NR_cacheflush (ARM_NR_BASE + 2) #define ARM_NR_cacheflush (ARM_NR_BASE + 2)
#define ARM_NR_set_tls (ARM_NR_BASE + 5) #define ARM_NR_set_tls (ARM_NR_BASE + 5)

4
linux-user/main.c
View File

@ -806,6 +806,9 @@ void cpu_loop(CPUARMState *env)
cpu_set_tls(env, env->regs[0]); cpu_set_tls(env, env->regs[0]);
env->regs[0] = 0; env->regs[0] = 0;
break; break;
case ARM_NR_breakpoint:
env->regs[15] -= env->thumb ? 2 : 4;
goto excp_debug;
default: default:
gemu_log("qemu: Unsupported ARM syscall: 0x%x\n", gemu_log("qemu: Unsupported ARM syscall: 0x%x\n",
n); n);
@ -849,6 +852,7 @@ void cpu_loop(CPUARMState *env)
} }
break; break;
case EXCP_DEBUG: case EXCP_DEBUG:
excp_debug:
{ {
int sig; int sig;