/* from syscall's path, where we know the ABI */ int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) { return __copy_siginfo_to_user32(to, from, in_x32_syscall()); }
int ia32_setup_rt_frame(int sig, struct ksignal *ksig, compat_sigset_t *set, struct pt_regs *regs) { struct rt_sigframe_ia32 __user *frame; void __user *restorer; int err = 0; void __user *fpstate = NULL; /* __copy_to_user optimizes that into a single 8 byte store */ static const struct { u8 movl; u32 val; u16 int80; u8 pad; } __attribute__((packed)) code = { 0xb8, __NR_ia32_rt_sigreturn, 0x80cd, 0, }; frame = get_sigframe(ksig, regs, sizeof(*frame), &fpstate); if (!access_ok(frame, sizeof(*frame))) return -EFAULT; put_user_try { put_user_ex(sig, &frame->sig); put_user_ex(ptr_to_compat(&frame->info), &frame->pinfo); put_user_ex(ptr_to_compat(&frame->uc), &frame->puc); /* Create the ucontext. */ if (boot_cpu_has(X86_FEATURE_XSAVE)) put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags); else put_user_ex(0, &frame->uc.uc_flags); put_user_ex(0, &frame->uc.uc_link); compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp); if (ksig->ka.sa.sa_flags & SA_RESTORER) restorer = ksig->ka.sa.sa_restorer; else restorer = current->mm->context.vdso + vdso_image_32.sym___kernel_rt_sigreturn; put_user_ex(ptr_to_compat(restorer), &frame->pretcode); /* * Not actually used anymore, but left because some gdb * versions need it. */ put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode); } put_user_catch(err); err |= __copy_siginfo_to_user32(&frame->info, &ksig->info, false); err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate, regs, set->sig[0]); err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)); if (err) return -EFAULT; /* Set up registers for signal handler */ regs->sp = (unsigned long) frame; regs->ip = (unsigned long) ksig->ka.sa.sa_handler; /* Make -mregparm=3 work */ regs->ax = sig; regs->dx = (unsigned long) &frame->info; regs->cx = (unsigned long) &frame->uc; loadsegment(ds, __USER32_DS); loadsegment(es, __USER32_DS); regs->cs = __USER32_CS; regs->ss = __USER32_DS; return 0; }