diff options
| -rw-r--r-- | linux-user/xtensa/signal.c | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/linux-user/xtensa/signal.c b/linux-user/xtensa/signal.c index f5fb8b5cbe..32dcfa5229 100644 --- a/linux-user/xtensa/signal.c +++ b/linux-user/xtensa/signal.c @@ -157,6 +157,9 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, { abi_ulong frame_addr; struct target_rt_sigframe *frame; + int is_fdpic = info_is_fdpic(((TaskState *)thread_cpu->opaque)->info); + abi_ulong handler = 0; + abi_ulong handler_fdpic_GOT = 0; uint32_t ra; bool abi_call0; unsigned base; @@ -165,6 +168,17 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, frame_addr = get_sigframe(ka, env, sizeof(*frame)); trace_user_setup_rt_frame(env, frame_addr); + if (is_fdpic) { + abi_ulong funcdesc_ptr = ka->_sa_handler; + + if (get_user_ual(handler, funcdesc_ptr) + || get_user_ual(handler_fdpic_GOT, funcdesc_ptr + 4)) { + goto give_sigsegv; + } + } else { + handler = ka->_sa_handler; + } + if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { goto give_sigsegv; } @@ -185,14 +199,21 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, } if (ka->sa_flags & TARGET_SA_RESTORER) { - ra = ka->sa_restorer; + if (is_fdpic) { + if (get_user_ual(ra, ka->sa_restorer)) { + unlock_user_struct(frame, frame_addr, 0); + goto give_sigsegv; + } + } else { + ra = ka->sa_restorer; + } } else { /* Not used, but retain for ABI compatibility. */ install_sigtramp(frame->retcode); ra = default_rt_sigreturn; } memset(env->regs, 0, sizeof(env->regs)); - env->pc = ka->_sa_handler; + env->pc = handler; env->regs[1] = frame_addr; env->sregs[WINDOW_BASE] = 0; env->sregs[WINDOW_START] = 1; @@ -212,6 +233,9 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, env->regs[base + 3] = frame_addr + offsetof(struct target_rt_sigframe, info); env->regs[base + 4] = frame_addr + offsetof(struct target_rt_sigframe, uc); + if (is_fdpic) { + env->regs[base + 11] = handler_fdpic_GOT; + } unlock_user_struct(frame, frame_addr, 1); return; |