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authorHunter Laux <hunterlaux@gmail.com>2014-06-20 04:13:14 -0700
committerMichael Tokarev <mjt@tls.msk.ru>2014-06-24 20:01:24 +0400
commitd535508793a8e9389379543ef8d506e50c10cf67 (patch)
treec8ba8396f451f41d8364439e7027c5caa046c3a9 /linux-user
parent5f22b054f2594e231b042ada24d2fdfaa9c26d52 (diff)
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: Hunter Laux <hunterlaux@gmail.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/arm/syscall.h1
-rw-r--r--linux-user/main.c4
2 files changed, 5 insertions, 0 deletions
diff --git a/linux-user/arm/syscall.h b/linux-user/arm/syscall.h
index ce2c2a8ed0..e0d2cc3e5d 100644
--- a/linux-user/arm/syscall.h
+++ b/linux-user/arm/syscall.h
@@ -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)
diff --git a/linux-user/main.c b/linux-user/main.c
index df1bb0e758..900a17fa33 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -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;