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) /*  linux/arch/sparc/kernel/signal.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *  Copyright (C) 1997 Eddie C. Dost   (ecd@skynet.be)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/tty.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/binfmts.h>	/* do_coredum */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <asm/cacheflush.h>	/* flush_sig_insns */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <asm/switch_to.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include "sigutil.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include "kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) extern void fpsave(unsigned long *fpregs, unsigned long *fsr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		   void *fpqueue, unsigned long *fpqdepth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) extern void fpload(unsigned long *fpregs, unsigned long *fsr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) struct signal_frame {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct sparc_stackf	ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	__siginfo32_t		info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	__siginfo_fpu_t __user	*fpu_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	unsigned long		insns[2] __attribute__ ((aligned (8)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	unsigned int		extramask[_NSIG_WORDS - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	unsigned int		extra_size; /* Should be 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	__siginfo_rwin_t __user	*rwin_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) } __attribute__((aligned(8)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) struct rt_signal_frame {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	struct sparc_stackf	ss;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	siginfo_t		info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct pt_regs		regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	sigset_t		mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	__siginfo_fpu_t __user	*fpu_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	unsigned int		insns[2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	stack_t			stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	unsigned int		extra_size; /* Should be 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	__siginfo_rwin_t __user	*rwin_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) } __attribute__((aligned(8)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) /* Align macros */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) #define SF_ALIGNEDSZ  (((sizeof(struct signal_frame) + 7) & (~7)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) /* Checks if the fp is valid.  We always build signal frames which are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63)  * 16-byte aligned, therefore we can always enforce that the restore
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64)  * frame has that property as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) static inline bool invalid_frame_pointer(void __user *fp, int fplen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	if ((((unsigned long) fp) & 15) || !access_ok(fp, fplen))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) asmlinkage void do_sigreturn(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	unsigned long up_psr, pc, npc, ufp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct signal_frame __user *sf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	__siginfo_fpu_t __user *fpu_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	__siginfo_rwin_t __user *rwin_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	/* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	synchronize_user_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	sf = (struct signal_frame __user *) regs->u_regs[UREG_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	/* 1. Make sure we are not getting garbage from the user */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	if (invalid_frame_pointer(sf, sizeof(*sf)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 		goto segv_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 		goto segv_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (ufp & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		goto segv_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	err = __get_user(pc,  &sf->info.si_regs.pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	err |= __get_user(npc, &sf->info.si_regs.npc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	if ((pc | npc) & 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		goto segv_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	/* 2. Restore the state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	up_psr = regs->psr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	err |= __copy_from_user(regs, &sf->info.si_regs, sizeof(struct pt_regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	/* User can only change condition codes and FPU enabling in %psr. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	regs->psr = (up_psr & ~(PSR_ICC | PSR_EF))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		  | (regs->psr & (PSR_ICC | PSR_EF));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	/* Prevent syscall restart.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	pt_regs_clear_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	err |= __get_user(fpu_save, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (fpu_save)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		err |= restore_fpu_state(regs, fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	err |= __get_user(rwin_save, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (rwin_save)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		err |= restore_rwin_state(rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	/* This is pretty much atomic, no amount locking would prevent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	 * the races which exist anyways.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	err |= __get_user(set.sig[0], &sf->info.si_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	err |= __copy_from_user(&set.sig[1], &sf->extramask,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 			        (_NSIG_WORDS-1) * sizeof(unsigned int));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 			   
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		goto segv_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) segv_and_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	struct rt_signal_frame __user *sf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	unsigned int psr, pc, npc, ufp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	__siginfo_fpu_t __user *fpu_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	__siginfo_rwin_t __user *rwin_save;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	synchronize_user_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (invalid_frame_pointer(sf, sizeof(*sf)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (ufp & 0x7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	err = __get_user(pc, &sf->regs.pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	err |= __get_user(npc, &sf->regs.npc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	err |= ((pc | npc) & 0x03);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	err |= __get_user(regs->y, &sf->regs.y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	err |= __get_user(psr, &sf->regs.psr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	err |= __copy_from_user(&regs->u_regs[UREG_G1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 				&sf->regs.u_regs[UREG_G1], 15 * sizeof(u32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	regs->psr = (regs->psr & ~PSR_ICC) | (psr & PSR_ICC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	/* Prevent syscall restart.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	pt_regs_clear_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	err |= __get_user(fpu_save, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (!err && fpu_save)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		err |= restore_fpu_state(regs, fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	err |= restore_altstack(&sf->stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		goto segv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	regs->pc = pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	regs->npc = npc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	err |= __get_user(rwin_save, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (!err && rwin_save) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		if (restore_rwin_state(rwin_save))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			goto segv;
^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) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) segv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	unsigned long sp = regs->u_regs[UREG_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	 * If we are on the alternate signal stack and would overflow it, don't.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	 * Return an always-bogus address instead so we will die with SIGSEGV.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 		return (void __user *) -1L;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	/* This is the X/Open sanctioned signal stack switching.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	sp = sigsp(sp, ksig) - framesize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	/* Always align the stack frame.  This handles two cases.  First,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	 * sigaltstack need not be mindful of platform specific stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	 * alignment.  Second, if we took this signal because the stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	 * is not aligned properly, we'd like to take the signal cleanly
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	 * and report that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	sp &= ~15UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	return (void __user *) sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) static int setup_frame(struct ksignal *ksig, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		       sigset_t *oldset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	struct signal_frame __user *sf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	int sigframe_size, err, wsaved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	void __user *tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	/* 1. Make sure everything is clean */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	synchronize_user_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	wsaved = current_thread_info()->w_saved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	sigframe_size = sizeof(*sf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	if (used_math())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		sigframe_size += sizeof(__siginfo_fpu_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	if (wsaved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		sigframe_size += sizeof(__siginfo_rwin_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	sf = (struct signal_frame __user *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		get_sigframe(ksig, regs, sigframe_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (invalid_frame_pointer(sf, sigframe_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		do_exit(SIGILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	tail = sf + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	/* 2. Save the current process state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	err = __copy_to_user(&sf->info.si_regs, regs, sizeof(struct pt_regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	err |= __put_user(0, &sf->extra_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (used_math()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		__siginfo_fpu_t __user *fp = tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		tail += sizeof(*fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		err |= save_fpu_state(regs, fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		err |= __put_user(fp, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		err |= __put_user(0, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	if (wsaved) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		__siginfo_rwin_t __user *rwp = tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		tail += sizeof(*rwp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		err |= save_rwin_state(wsaved, rwp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		err |= __put_user(rwp, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		err |= __put_user(0, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	err |= __put_user(oldset->sig[0], &sf->info.si_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	err |= __copy_to_user(sf->extramask, &oldset->sig[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 			      (_NSIG_WORDS - 1) * sizeof(unsigned int));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (!wsaved) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 				      sizeof(struct reg_window32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		struct reg_window32 *rp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		rp = &current_thread_info()->reg_window[wsaved - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		err |= __copy_to_user(sf, rp, sizeof(struct reg_window32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	/* 3. signal handler back-trampoline and parameters */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	regs->u_regs[UREG_FP] = (unsigned long) sf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	regs->u_regs[UREG_I0] = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	regs->u_regs[UREG_I2] = (unsigned long) &sf->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	/* 4. signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	regs->npc = (regs->pc + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	/* 5. return to kernel instructions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	if (ksig->ka.ka_restorer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 		regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		/* mov __NR_sigreturn, %g1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		err |= __put_user(0x821020d8, &sf->insns[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		/* t 0x10 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		err |= __put_user(0x91d02010, &sf->insns[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		/* Flush instruction space. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	return 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) static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			  sigset_t *oldset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	struct rt_signal_frame __user *sf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	int sigframe_size, wsaved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	void __user *tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	unsigned int psr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	synchronize_user_stack();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	wsaved = current_thread_info()->w_saved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	sigframe_size = sizeof(*sf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	if (used_math())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		sigframe_size += sizeof(__siginfo_fpu_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	if (wsaved)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		sigframe_size += sizeof(__siginfo_rwin_t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	sf = (struct rt_signal_frame __user *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		get_sigframe(ksig, regs, sigframe_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (invalid_frame_pointer(sf, sigframe_size)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		do_exit(SIGILL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	tail = sf + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	err  = __put_user(regs->pc, &sf->regs.pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	err |= __put_user(regs->npc, &sf->regs.npc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	err |= __put_user(regs->y, &sf->regs.y);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	psr = regs->psr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	if (used_math())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		psr |= PSR_EF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	err |= __put_user(psr, &sf->regs.psr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	err |= __copy_to_user(&sf->regs.u_regs, regs->u_regs, sizeof(regs->u_regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	err |= __put_user(0, &sf->extra_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	if (psr & PSR_EF) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		__siginfo_fpu_t __user *fp = tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		tail += sizeof(*fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		err |= save_fpu_state(regs, fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		err |= __put_user(fp, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		err |= __put_user(0, &sf->fpu_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (wsaved) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		__siginfo_rwin_t __user *rwp = tail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		tail += sizeof(*rwp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		err |= save_rwin_state(wsaved, rwp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		err |= __put_user(rwp, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		err |= __put_user(0, &sf->rwin_save);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	err |= __copy_to_user(&sf->mask, &oldset->sig[0], sizeof(sigset_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	/* Setup sigaltstack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	err |= __save_altstack(&sf->stack, regs->u_regs[UREG_FP]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	if (!wsaved) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		err |= __copy_to_user(sf, (char *) regs->u_regs[UREG_FP],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 				      sizeof(struct reg_window32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 		struct reg_window32 *rp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 		rp = &current_thread_info()->reg_window[wsaved - 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 		err |= __copy_to_user(sf, rp, sizeof(struct reg_window32));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	err |= copy_siginfo_to_user(&sf->info, &ksig->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	regs->u_regs[UREG_FP] = (unsigned long) sf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	regs->u_regs[UREG_I0] = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	regs->u_regs[UREG_I1] = (unsigned long) &sf->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	regs->u_regs[UREG_I2] = (unsigned long) &sf->regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	regs->npc = (regs->pc + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	if (ksig->ka.ka_restorer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 		regs->u_regs[UREG_I7] = (unsigned long)ksig->ka.ka_restorer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 	else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 		regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		/* mov __NR_sigreturn, %g1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		err |= __put_user(0x821020d8, &sf->insns[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 		/* t 0x10 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		err |= __put_user(0x91d02010, &sf->insns[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 			return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		/* Flush instruction space. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 		flush_sig_insns(current->mm, (unsigned long) &(sf->insns[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) handle_signal(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	sigset_t *oldset = sigmask_to_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	if (ksig->ka.sa.sa_flags & SA_SIGINFO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 		err = setup_rt_frame(ksig, regs, oldset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 		err = setup_frame(ksig, regs, oldset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	signal_setup_done(err, ksig, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) static inline void syscall_restart(unsigned long orig_i0, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 				   struct sigaction *sa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	switch(regs->u_regs[UREG_I0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	case ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	case ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	no_system_call_restart:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 		regs->u_regs[UREG_I0] = EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 		regs->psr |= PSR_C;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 	case ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 		if (!(sa->sa_flags & SA_RESTART))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 			goto no_system_call_restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 	case ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 		regs->u_regs[UREG_I0] = orig_i0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 		regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 		regs->npc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) /* Note that 'init' is a special process: it doesn't get signals it doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)  * want to handle. Thus you cannot kill init even with a SIGKILL even by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)  * mistake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) static void do_signal(struct pt_regs *regs, unsigned long orig_i0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 	int restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) 	bool has_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) 	/* It's a lot of work and synchronization to add a new ptrace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	 * register for GDB to save and restore in order to get
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 	 * orig_i0 correct for syscall restarts when debugging.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) 	 * Although it should be the case that most of the global
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 	 * registers are volatile across a system call, glibc already
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) 	 * depends upon that fact that we preserve them.  So we can't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) 	 * just use any global register to save away the orig_i0 value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) 	 * In particular %g2, %g3, %g4, and %g5 are all assumed to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 	 * preserved across a system call trap by various pieces of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) 	 * code in glibc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 	 * %g7 is used as the "thread register".   %g6 is not used in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) 	 * any fixed manner.  %g6 is used as a scratch register and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 	 * a compiler temporary, but it's value is never used across
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) 	 * a system call.  Therefore %g6 is usable for orig_i0 storage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) 	if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) 		regs->u_regs[UREG_G6] = orig_i0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) 	has_handler = get_signal(&ksig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) 	/* If the debugger messes with the program counter, it clears
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) 	 * the software "in syscall" bit, directing us to not perform
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) 	 * a syscall restart.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) 	restart_syscall = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) 	if (pt_regs_is_syscall(regs) && (regs->psr & PSR_C)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) 		restart_syscall = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) 		orig_i0 = regs->u_regs[UREG_G6];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) 	if (has_handler) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) 		if (restart_syscall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) 			syscall_restart(orig_i0, regs, &ksig.ka.sa);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) 		handle_signal(&ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) 		if (restart_syscall) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) 			switch (regs->u_regs[UREG_I0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) 			case ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) 	     		case ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) 			case ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) 				/* replay the system call when we are done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) 				regs->u_regs[UREG_I0] = orig_i0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) 				regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) 				regs->npc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) 				pt_regs_clear_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) 				fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) 			case ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) 				regs->u_regs[UREG_G1] = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) 				regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) 				regs->npc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) 				pt_regs_clear_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) 		restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) void do_notify_resume(struct pt_regs *regs, unsigned long orig_i0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) 		      unsigned long thread_info_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) 	if (thread_info_flags & _TIF_SIGPENDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) 		do_signal(regs, orig_i0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) 	if (thread_info_flags & _TIF_NOTIFY_RESUME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) 		tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) asmlinkage int do_sys_sigstack(struct sigstack __user *ssptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)                                struct sigstack __user *ossptr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)                                unsigned long sp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) 	int ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) 	/* First see if old state is wanted. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) 	if (ossptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) 		if (put_user(current->sas_ss_sp + current->sas_ss_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) 			     &ossptr->the_stack) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) 		    __put_user(on_sig_stack(sp), &ossptr->cur_status))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) 	/* Now see if we want to update the new state. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) 	if (ssptr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) 		char *ss_sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) 		if (get_user(ss_sp, &ssptr->the_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) 		/* If the current stack was set with sigaltstack, don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) 		   swap stacks while we are on it.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) 		ret = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) 		if (current->sas_ss_sp && on_sig_stack(sp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) 			goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) 		/* Since we don't know the extent of the stack, and we don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) 		   track onstack-ness, but rather calculate it, we must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) 		   presume a size.  Ho hum this interface is lossy.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) 		current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) 		current->sas_ss_size = SIGSTKSZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) }