From 256cb6af7f04ae385883408084b3ef989e2423d8 Mon Sep 17 00:00:00 2001 From: Timothy E Baldwin Date: Thu, 12 May 2016 18:47:37 +0100 Subject: [PATCH] linux-user: Support for restarting system calls for UniCore32 targets Update the UniCore32 main loop code: * on TARGET_ERESTARTSYS, wind guest PC backwards to repeat syscall insn * handle TARGET_QEMU_ESIGRETURN in the main loop as the indication that the main loop should not touch any guest CPU state (We don't support signals on this target so there is no sigreturn code to update.) Signed-off-by: Timothy Edward Baldwin Message-id: 1441497448-32489-30-git-send-email-T.E.Baldwin99@members.leeds.ac.uk Reviewed-by: Peter Maydell [PMM: tweak commit message; drop TARGET_USE_ERESTARTSYS define] Signed-off-by: Peter Maydell Signed-off-by: Riku Voipio --- linux-user/main.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/linux-user/main.c b/linux-user/main.c index cc7f2aa3c3..9e6448af48 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -1171,7 +1171,7 @@ void cpu_loop(CPUUniCore32State *env) cpu_set_tls(env, env->regs[0]); env->regs[0] = 0; } else { - env->regs[0] = do_syscall(env, + abi_long ret = do_syscall(env, n, env->regs[0], env->regs[1], @@ -1180,6 +1180,11 @@ void cpu_loop(CPUUniCore32State *env) env->regs[4], env->regs[5], 0, 0); + if (ret == -TARGET_ERESTARTSYS) { + env->regs[31] -= 4; + } else if (ret != -TARGET_QEMU_ESIGRETURN) { + env->regs[0] = ret; + } } } else { goto error;