Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *  linux/arch/x86_64/ia32/ia32_signal.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *  2000-12-*   x86-64 compatibility mode signal handling by Andi Kleen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/binfmts.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <asm/fpu/internal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <asm/fpu/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <asm/ia32_unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <asm/user32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <uapi/asm/sigcontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <asm/proto.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <asm/vdso.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <asm/sigframe.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <asm/sighandling.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include <asm/smap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) static inline void reload_segments(struct sigcontext_32 *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	unsigned int cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	savesegment(gs, cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if ((sc->gs | 0x03) != cur)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		load_gs_index(sc->gs | 0x03);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	savesegment(fs, cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	if ((sc->fs | 0x03) != cur)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 		loadsegment(fs, sc->fs | 0x03);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	savesegment(ds, cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	if ((sc->ds | 0x03) != cur)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 		loadsegment(ds, sc->ds | 0x03);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	savesegment(es, cur);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	if ((sc->es | 0x03) != cur)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 		loadsegment(es, sc->es | 0x03);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58)  * Do a signal return; undo the signal stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static int ia32_restore_sigcontext(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 				   struct sigcontext_32 __user *usc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct sigcontext_32 sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	/* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if (unlikely(copy_from_user(&sc, usc, sizeof(sc))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	/* Get only the ia32 registers. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	regs->bx = sc.bx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	regs->cx = sc.cx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	regs->dx = sc.dx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	regs->si = sc.si;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	regs->di = sc.di;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	regs->bp = sc.bp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	regs->ax = sc.ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	regs->sp = sc.sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	regs->ip = sc.ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	/* Get CS/SS and force CPL3 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	regs->cs = sc.cs | 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	regs->ss = sc.ss | 0x03;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	regs->flags = (regs->flags & ~FIX_EFLAGS) | (sc.flags & FIX_EFLAGS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	/* disable syscall checks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	regs->orig_ax = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	 * Reload fs and gs if they have changed in the signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	 * handler.  This does not handle long fs/gs base changes in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	 * the handler, but does not clobber them at least in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	 * normal case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	reload_segments(&sc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	return fpu__restore_sig(compat_ptr(sc.fpstate), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) COMPAT_SYSCALL_DEFINE0(sigreturn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	struct sigframe_ia32 __user *frame = (struct sigframe_ia32 __user *)(regs->sp-8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	if (__get_user(set.sig[0], &frame->sc.oldmask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	    || __get_user(((__u32 *)&set)[1], &frame->extramask[0]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	if (ia32_restore_sigcontext(regs, &frame->sc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	return regs->ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	signal_fault(regs, frame, "32bit sigreturn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) COMPAT_SYSCALL_DEFINE0(rt_sigreturn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	struct pt_regs *regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	struct rt_sigframe_ia32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	frame = (struct rt_sigframe_ia32 __user *)(regs->sp - 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (__get_user(set.sig[0], (__u64 __user *)&frame->uc.uc_sigmask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	if (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (compat_restore_altstack(&frame->uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	return regs->ax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	signal_fault(regs, frame, "32bit rt sigreturn");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)  * Set up a signal frame.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) #define get_user_seg(seg)	({ unsigned int v; savesegment(seg, v); v; })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static __always_inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) __unsafe_setup_sigcontext32(struct sigcontext_32 __user *sc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			    void __user *fpstate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 			    struct pt_regs *regs, unsigned int mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	unsafe_put_user(get_user_seg(gs), (unsigned int __user *)&sc->gs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	unsafe_put_user(get_user_seg(fs), (unsigned int __user *)&sc->fs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	unsafe_put_user(get_user_seg(ds), (unsigned int __user *)&sc->ds, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	unsafe_put_user(get_user_seg(es), (unsigned int __user *)&sc->es, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	unsafe_put_user(regs->di, &sc->di, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	unsafe_put_user(regs->si, &sc->si, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	unsafe_put_user(regs->bp, &sc->bp, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	unsafe_put_user(regs->sp, &sc->sp, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	unsafe_put_user(regs->bx, &sc->bx, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	unsafe_put_user(regs->dx, &sc->dx, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	unsafe_put_user(regs->cx, &sc->cx, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	unsafe_put_user(regs->ax, &sc->ax, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	unsafe_put_user(current->thread.trap_nr, &sc->trapno, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	unsafe_put_user(current->thread.error_code, &sc->err, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	unsafe_put_user(regs->ip, &sc->ip, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	unsafe_put_user(regs->cs, (unsigned int __user *)&sc->cs, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	unsafe_put_user(regs->flags, &sc->flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	unsafe_put_user(regs->sp, &sc->sp_at_signal, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	unsafe_put_user(regs->ss, (unsigned int __user *)&sc->ss, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	unsafe_put_user(ptr_to_compat(fpstate), &sc->fpstate, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	/* non-iBCS2 extensions.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	unsafe_put_user(mask, &sc->oldmask, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	unsafe_put_user(current->thread.cr2, &sc->cr2, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) #define unsafe_put_sigcontext32(sc, fp, regs, set, label)		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) do {									\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	if (__unsafe_setup_sigcontext32(sc, fp, regs, set->sig[0]))	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 		goto label;						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) } while(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)  * Determine which stack to use..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 				 size_t frame_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 				 void __user **fpstate)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	unsigned long sp, fx_aligned, math_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	/* Default to using normal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	sp = regs->sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	/* This is the X/Open sanctioned signal stack switching.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (ksig->ka.sa.sa_flags & SA_ONSTACK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		sp = sigsp(sp, ksig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	/* This is the legacy signal stack switching. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	else if (regs->ss != __USER32_DS &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		!(ksig->ka.sa.sa_flags & SA_RESTORER) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		 ksig->ka.sa.sa_restorer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		sp = (unsigned long) ksig->ka.sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	sp = fpu__alloc_mathframe(sp, 1, &fx_aligned, &math_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	*fpstate = (struct _fpstate_32 __user *) sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (copy_fpstate_to_sigframe(*fpstate, (void __user *)fx_aligned,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 				     math_size) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		return (void __user *) -1L;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	sp -= frame_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	/* Align the stack pointer according to the i386 ABI,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	 * i.e. so that on function entry ((sp + 4) & 15) == 0. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	sp = ((sp + 4) & -16ul) - 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	return (void __user *) sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) int ia32_setup_frame(int sig, struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		     compat_sigset_t *set, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	struct sigframe_ia32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	void __user *restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	void __user *fp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	/* copy_to_user optimizes that into a single 8 byte store */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	static const struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		u16 poplmovl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		u16 int80;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	} __attribute__((packed)) code = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		0xb858,		 /* popl %eax ; movl $...,%eax */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		__NR_ia32_sigreturn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		0x80cd,		/* int $0x80 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	frame = get_sigframe(ksig, regs, sizeof(*frame), &fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (ksig->ka.sa.sa_flags & SA_RESTORER) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		restorer = ksig->ka.sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		/* Return stub is in 32bit vsyscall page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		if (current->mm->context.vdso)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			restorer = current->mm->context.vdso +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 				vdso_image_32.sym___kernel_sigreturn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			restorer = &frame->retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (!user_access_begin(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	unsafe_put_user(sig, &frame->sig, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	unsafe_put_sigcontext32(&frame->sc, fp, regs, set, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	unsafe_put_user(set->sig[1], &frame->extramask[0], Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	unsafe_put_user(ptr_to_compat(restorer), &frame->pretcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	 * These are actually not used anymore, but left because some
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	 * gdb versions depend on them as a marker.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	unsafe_put_user(*((u64 *)&code), (u64 __user *)frame->retcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	/* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	regs->sp = (unsigned long) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	/* Make -mregparm=3 work */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	regs->ax = sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	regs->dx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	regs->cx = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	loadsegment(ds, __USER32_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	loadsegment(es, __USER32_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	regs->cs = __USER32_CS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	regs->ss = __USER32_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) int ia32_setup_rt_frame(int sig, struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 			compat_sigset_t *set, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	struct rt_sigframe_ia32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	void __user *restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	void __user *fp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	/* unsafe_put_user optimizes that into a single 8 byte store */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	static const struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		u8 movl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		u32 val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		u16 int80;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 		u8  pad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	} __attribute__((packed)) code = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		0xb8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		__NR_ia32_rt_sigreturn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 		0x80cd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	frame = get_sigframe(ksig, regs, sizeof(*frame), &fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (!user_access_begin(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	unsafe_put_user(sig, &frame->sig, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	unsafe_put_user(ptr_to_compat(&frame->info), &frame->pinfo, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	unsafe_put_user(ptr_to_compat(&frame->uc), &frame->puc, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	/* Create the ucontext.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	if (static_cpu_has(X86_FEATURE_XSAVE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		unsafe_put_user(UC_FP_XSTATE, &frame->uc.uc_flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		unsafe_put_user(0, &frame->uc.uc_flags, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	unsafe_put_user(0, &frame->uc.uc_link, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	unsafe_compat_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	if (ksig->ka.sa.sa_flags & SA_RESTORER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		restorer = ksig->ka.sa.sa_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		restorer = current->mm->context.vdso +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 			vdso_image_32.sym___kernel_rt_sigreturn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	unsafe_put_user(ptr_to_compat(restorer), &frame->pretcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	 * Not actually used anymore, but left because some gdb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	 * versions need it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	unsafe_put_user(*((u64 *)&code), (u64 __user *)frame->retcode, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	unsafe_put_sigcontext32(&frame->uc.uc_mcontext, fp, regs, set, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	unsafe_put_user(*(__u64 *)set, (__u64 *)&frame->uc.uc_sigmask, Efault);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	if (__copy_siginfo_to_user32(&frame->info, &ksig->info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	/* Set up registers for signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	regs->sp = (unsigned long) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	regs->ip = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	/* Make -mregparm=3 work */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	regs->ax = sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	regs->dx = (unsigned long) &frame->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	regs->cx = (unsigned long) &frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	loadsegment(ds, __USER32_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 	loadsegment(es, __USER32_DS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	regs->cs = __USER32_CS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	regs->ss = __USER32_DS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) Efault:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	user_access_end();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }