From 7ccb84a91618eda626b12ce83d62cfe678cfc58f Mon Sep 17 00:00:00 2001 From: Timothy E Baldwin Date: Thu, 12 May 2016 18:47:39 +0100 Subject: linux-user: Support for restarting system calls for M68K targets Update the M68K main loop and sigreturn code: * on TARGET_ERESTARTSYS, wind guest PC backwards to repeat syscall insn * set all guest CPU state within signal.c code on sigreturn * handle TARGET_QEMU_ESIGRETURN in the main loop as the indication that the main loop should not touch any guest CPU state Signed-off-by: Timothy Edward Baldwin Message-id: 1441497448-32489-32-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 | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) (limited to 'linux-user/main.c') diff --git a/linux-user/main.c b/linux-user/main.c index 6a0be7db1c..58dc91ced5 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -3086,18 +3086,24 @@ void cpu_loop(CPUM68KState *env) break; case EXCP_TRAP0: { + abi_long ret; ts->sim_syscalls = 0; n = env->dregs[0]; env->pc += 2; - env->dregs[0] = do_syscall(env, - n, - env->dregs[1], - env->dregs[2], - env->dregs[3], - env->dregs[4], - env->dregs[5], - env->aregs[0], - 0, 0); + ret = do_syscall(env, + n, + env->dregs[1], + env->dregs[2], + env->dregs[3], + env->dregs[4], + env->dregs[5], + env->aregs[0], + 0, 0); + if (ret == -TARGET_ERESTARTSYS) { + env->pc -= 2; + } else if (ret != -TARGET_QEMU_ESIGRETURN) { + env->dregs[0] = ret; + } } break; case EXCP_INTERRUPT: -- cgit 1.4.1