From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57791) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Wxwm4-00046t-R7 for qemu-devel@nongnu.org; Fri, 20 Jun 2014 07:14:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Wxwlz-0000ib-5P for qemu-devel@nongnu.org; Fri, 20 Jun 2014 07:14:28 -0400 From: Hunter Laux Date: Fri, 20 Jun 2014 04:13:14 -0700 Message-Id: <1403262794-19963-1-git-send-email-hunterlaux@gmail.com> Subject: [Qemu-devel] [PATCH v2] Add support for the arm breakpoint syscall List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, qemu-trivial@nongnu.org, riku.voipio@iki.fi, peter.maydell@linaro.org Cc: Hunter Laux 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 --- linux-user/arm/syscall.h | 1 + linux-user/main.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/linux-user/arm/syscall.h b/linux-user/arm/syscall.h index ce2c2a8..e0d2cc3 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 a87c6f7..9c3eddc 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -807,6 +807,9 @@ 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); @@ -850,6 +853,7 @@ void cpu_loop(CPUARMState *env) } break; case EXCP_DEBUG: + excp_debug: { int sig; -- 1.9.1