| /* |
| * Copyright (C) 2009 Tomasz Grabiec |
| * |
| * This file is released under the GPL version 2 with the following |
| * clarification and special exception: |
| * |
| * Linking this library statically or dynamically with other modules is |
| * making a combined work based on this library. Thus, the terms and |
| * conditions of the GNU General Public License cover the whole |
| * combination. |
| * |
| * As a special exception, the copyright holders of this library give you |
| * permission to link this library with independent modules to produce an |
| * executable, regardless of the license terms of these independent |
| * modules, and to copy and distribute the resulting executable under terms |
| * of your choice, provided that you also meet, for each linked independent |
| * module, the terms and conditions of the license of that module. An |
| * independent module is a module which is not derived from or based on |
| * this library. If you modify this library, you may extend this exception |
| * to your version of the library, but you are not obligated to do so. If |
| * you do not wish to do so, delete this exception statement from your |
| * version. |
| * |
| * Please refer to the file LICENSE for details. |
| */ |
| |
| #include "sys/signal.h" |
| |
| #include "jit/cu-mapping.h" |
| #include "jit/compiler.h" |
| |
| #include "arch/stack-frame.h" |
| |
| #include "vm/signal.h" |
| |
| extern void signal_bh_trampoline(void *bh); |
| |
| bool signal_from_native(void *ctx) |
| { |
| ucontext_t *uc; |
| |
| uc = ctx; |
| |
| return is_native(uc->uc_mcontext.gregs[REG_IP]); |
| } |
| |
| struct compilation_unit *get_signal_source_cu(void *ctx) |
| { |
| ucontext_t *uc; |
| |
| uc = ctx; |
| return jit_lookup_cu(uc->uc_mcontext.gregs[REG_IP]); |
| } |
| |
| /** |
| * install_signal_bh - installs signal's bottom half function by |
| * modifying user context so that control will be returned to @bh |
| * when signal handler returns. When @bh function returns, the |
| * control should be returned to the source of the signal. |
| * |
| * @ctx: pointer to struct ucontext_t |
| * @bh: bottom half function to install |
| */ |
| int install_signal_bh(void *ctx, signal_bh_fn bh) |
| { |
| unsigned long *stack; |
| ucontext_t *uc; |
| |
| uc = ctx; |
| |
| stack = (unsigned long *) uc->uc_mcontext.gregs[REG_SP]; |
| |
| /* push bottom-half handler address on stack */ |
| *(--stack) = (unsigned long) bh; |
| |
| /* push return address on stack */ |
| *(--stack) = uc->uc_mcontext.gregs[REG_IP]; |
| |
| uc->uc_mcontext.gregs[REG_SP] = (unsigned long) stack; |
| uc->uc_mcontext.gregs[REG_IP] = (unsigned long) signal_bh_trampoline; |
| |
| return 0; |
| } |