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) // Copyright (C) 2005-2017 Andes Technology Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/freezer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <asm/fpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/vdso.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) struct rt_sigframe {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	struct siginfo info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 	struct ucontext uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #if IS_ENABLED(CONFIG_FPU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static inline int restore_sigcontext_fpu(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 					 struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct task_struct *tsk = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	unsigned long used_math_flag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	clear_used_math();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	__get_user_error(used_math_flag, &sc->used_math_flag, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (!used_math_flag)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	set_used_math();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #if IS_ENABLED(CONFIG_LAZY_FPU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if (current == last_task_used_math) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		last_task_used_math = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		disable_ptreg_fpu(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	clear_fpu(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	return __copy_from_user(&tsk->thread.fpu, &sc->fpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 				sizeof(struct fpu_struct));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static inline int setup_sigcontext_fpu(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 				       struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	struct task_struct *tsk = current;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	__put_user_error(used_math(), &sc->used_math_flag, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (!used_math())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	preempt_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) #if IS_ENABLED(CONFIG_LAZY_FPU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (last_task_used_math == tsk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		save_fpu(last_task_used_math);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	unlazy_fpu(tsk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	ret = __copy_to_user(&sc->fpu, &tsk->thread.fpu,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			     sizeof(struct fpu_struct));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	preempt_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static int restore_sigframe(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			    struct rt_sigframe __user * sf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	err = __copy_from_user(&set, &sf->uc.uc_sigmask, sizeof(set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (err == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	__get_user_error(regs->uregs[0], &sf->uc.uc_mcontext.nds32_r0, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	__get_user_error(regs->uregs[1], &sf->uc.uc_mcontext.nds32_r1, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	__get_user_error(regs->uregs[2], &sf->uc.uc_mcontext.nds32_r2, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	__get_user_error(regs->uregs[3], &sf->uc.uc_mcontext.nds32_r3, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	__get_user_error(regs->uregs[4], &sf->uc.uc_mcontext.nds32_r4, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	__get_user_error(regs->uregs[5], &sf->uc.uc_mcontext.nds32_r5, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	__get_user_error(regs->uregs[6], &sf->uc.uc_mcontext.nds32_r6, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	__get_user_error(regs->uregs[7], &sf->uc.uc_mcontext.nds32_r7, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	__get_user_error(regs->uregs[8], &sf->uc.uc_mcontext.nds32_r8, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	__get_user_error(regs->uregs[9], &sf->uc.uc_mcontext.nds32_r9, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	__get_user_error(regs->uregs[10], &sf->uc.uc_mcontext.nds32_r10, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	__get_user_error(regs->uregs[11], &sf->uc.uc_mcontext.nds32_r11, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	__get_user_error(regs->uregs[12], &sf->uc.uc_mcontext.nds32_r12, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	__get_user_error(regs->uregs[13], &sf->uc.uc_mcontext.nds32_r13, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	__get_user_error(regs->uregs[14], &sf->uc.uc_mcontext.nds32_r14, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	__get_user_error(regs->uregs[15], &sf->uc.uc_mcontext.nds32_r15, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	__get_user_error(regs->uregs[16], &sf->uc.uc_mcontext.nds32_r16, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	__get_user_error(regs->uregs[17], &sf->uc.uc_mcontext.nds32_r17, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	__get_user_error(regs->uregs[18], &sf->uc.uc_mcontext.nds32_r18, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	__get_user_error(regs->uregs[19], &sf->uc.uc_mcontext.nds32_r19, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	__get_user_error(regs->uregs[20], &sf->uc.uc_mcontext.nds32_r20, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	__get_user_error(regs->uregs[21], &sf->uc.uc_mcontext.nds32_r21, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	__get_user_error(regs->uregs[22], &sf->uc.uc_mcontext.nds32_r22, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	__get_user_error(regs->uregs[23], &sf->uc.uc_mcontext.nds32_r23, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	__get_user_error(regs->uregs[24], &sf->uc.uc_mcontext.nds32_r24, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	__get_user_error(regs->uregs[25], &sf->uc.uc_mcontext.nds32_r25, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	__get_user_error(regs->fp, &sf->uc.uc_mcontext.nds32_fp, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	__get_user_error(regs->gp, &sf->uc.uc_mcontext.nds32_gp, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	__get_user_error(regs->lp, &sf->uc.uc_mcontext.nds32_lp, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	__get_user_error(regs->sp, &sf->uc.uc_mcontext.nds32_sp, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	__get_user_error(regs->ipc, &sf->uc.uc_mcontext.nds32_ipc, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #if defined(CONFIG_HWZOL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	__get_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	__get_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	__get_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) #if IS_ENABLED(CONFIG_FPU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	err |= restore_sigcontext_fpu(regs, &sf->uc.uc_mcontext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	 * Avoid sys_rt_sigreturn() restarting.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	forget_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	/* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	 * Since we stacked the signal on a 64-bit boundary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	 * then 'sp' should be two-word aligned here.  If it's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	 * not, then the user is trying to mess with us.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	if (regs->sp & 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	frame = (struct rt_sigframe __user *)regs->sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (restore_sigframe(regs, frame))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (restore_altstack(&frame->uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	return regs->uregs[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) setup_sigframe(struct rt_sigframe __user * sf, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	       sigset_t * set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	__put_user_error(regs->uregs[0], &sf->uc.uc_mcontext.nds32_r0, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	__put_user_error(regs->uregs[1], &sf->uc.uc_mcontext.nds32_r1, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	__put_user_error(regs->uregs[2], &sf->uc.uc_mcontext.nds32_r2, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	__put_user_error(regs->uregs[3], &sf->uc.uc_mcontext.nds32_r3, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	__put_user_error(regs->uregs[4], &sf->uc.uc_mcontext.nds32_r4, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	__put_user_error(regs->uregs[5], &sf->uc.uc_mcontext.nds32_r5, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	__put_user_error(regs->uregs[6], &sf->uc.uc_mcontext.nds32_r6, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	__put_user_error(regs->uregs[7], &sf->uc.uc_mcontext.nds32_r7, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	__put_user_error(regs->uregs[8], &sf->uc.uc_mcontext.nds32_r8, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	__put_user_error(regs->uregs[9], &sf->uc.uc_mcontext.nds32_r9, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	__put_user_error(regs->uregs[10], &sf->uc.uc_mcontext.nds32_r10, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	__put_user_error(regs->uregs[11], &sf->uc.uc_mcontext.nds32_r11, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	__put_user_error(regs->uregs[12], &sf->uc.uc_mcontext.nds32_r12, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	__put_user_error(regs->uregs[13], &sf->uc.uc_mcontext.nds32_r13, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	__put_user_error(regs->uregs[14], &sf->uc.uc_mcontext.nds32_r14, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	__put_user_error(regs->uregs[15], &sf->uc.uc_mcontext.nds32_r15, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	__put_user_error(regs->uregs[16], &sf->uc.uc_mcontext.nds32_r16, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	__put_user_error(regs->uregs[17], &sf->uc.uc_mcontext.nds32_r17, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	__put_user_error(regs->uregs[18], &sf->uc.uc_mcontext.nds32_r18, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	__put_user_error(regs->uregs[19], &sf->uc.uc_mcontext.nds32_r19, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	__put_user_error(regs->uregs[20], &sf->uc.uc_mcontext.nds32_r20, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	__put_user_error(regs->uregs[21], &sf->uc.uc_mcontext.nds32_r21, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	__put_user_error(regs->uregs[22], &sf->uc.uc_mcontext.nds32_r22, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	__put_user_error(regs->uregs[23], &sf->uc.uc_mcontext.nds32_r23, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	__put_user_error(regs->uregs[24], &sf->uc.uc_mcontext.nds32_r24, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	__put_user_error(regs->uregs[25], &sf->uc.uc_mcontext.nds32_r25, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	__put_user_error(regs->fp, &sf->uc.uc_mcontext.nds32_fp, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	__put_user_error(regs->gp, &sf->uc.uc_mcontext.nds32_gp, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	__put_user_error(regs->lp, &sf->uc.uc_mcontext.nds32_lp, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	__put_user_error(regs->sp, &sf->uc.uc_mcontext.nds32_sp, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	__put_user_error(regs->ipc, &sf->uc.uc_mcontext.nds32_ipc, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) #if defined(CONFIG_HWZOL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	__put_user_error(regs->lc, &sf->uc.uc_mcontext.zol.nds32_lc, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	__put_user_error(regs->le, &sf->uc.uc_mcontext.zol.nds32_le, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	__put_user_error(regs->lb, &sf->uc.uc_mcontext.zol.nds32_lb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) #if IS_ENABLED(CONFIG_FPU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	err |= setup_sigcontext_fpu(regs, &sf->uc.uc_mcontext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	__put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 			 err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	__put_user_error(current->thread.error_code,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 			 &sf->uc.uc_mcontext.error_code, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	__put_user_error(current->thread.address,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 			 &sf->uc.uc_mcontext.fault_address, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	__put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) static inline void __user *get_sigframe(struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 					struct pt_regs *regs, int framesize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	unsigned long sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	/* Default to using normal stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	sp = regs->sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	 * If we are on the alternate signal stack and would overflow it, don't.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	 * Return an always-bogus address instead so we will die with SIGSEGV.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - framesize)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		return (void __user __force *)(-1UL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	/* This is the X/Open sanctioned signal stack switching. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	sp = (sigsp(sp, ksig) - framesize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	 * nds32 mandates 8-byte alignment
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	sp &= ~0x7UL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	return (void __user *)sp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) setup_return(struct pt_regs *regs, struct ksignal *ksig, void __user * frame)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	unsigned long handler = (unsigned long)ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	unsigned long retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	retcode = VDSO_SYMBOL(current->mm->context.vdso, rt_sigtramp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	regs->uregs[0] = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	regs->sp = (unsigned long)frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	regs->lp = retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	regs->ipc = handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) setup_rt_frame(struct ksignal *ksig, sigset_t * set, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	struct rt_sigframe __user *frame =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	    get_sigframe(ksig, regs, sizeof(*frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	__put_user_error(0, &frame->uc.uc_flags, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	__put_user_error(NULL, &frame->uc.uc_link, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	err |= setup_sigframe(frame, regs, set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	if (err == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		setup_return(regs, ksig, frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 			err |= copy_siginfo_to_user(&frame->info, &ksig->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			regs->uregs[1] = (unsigned long)&frame->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			regs->uregs[2] = (unsigned long)&frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)  * OK, we're invoking a handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	sigset_t *oldset = sigmask_to_save();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	if (in_syscall(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 		/* Avoid additional syscall restarting via ret_slow_syscall. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 		forget_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		switch (regs->uregs[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			regs->uregs[0] = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 				regs->uregs[0] = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			regs->uregs[0] = regs->orig_r0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			regs->ipc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	 * Set up the stack frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	ret = setup_rt_frame(ksig, oldset, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	signal_setup_done(ret, ksig, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)  * Note that 'init' is a special process: it doesn't get signals it doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)  * want to handle. Thus you cannot kill init even with a SIGKILL even by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337)  * mistake.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)  * Note that we go through the signals twice: once to check the signals that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)  * the kernel can handle, and then we build all the user-level signal handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)  * stack-frames in one go after that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static void do_signal(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (get_signal(&ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		handle_signal(&ksig, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	 * If we were from a system call, check for system call restarting...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	if (in_syscall(regs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		/* Restart the system call - no handlers present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		/* Avoid additional syscall restarting via ret_slow_syscall. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		forget_syscall(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 		switch (regs->uregs[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 			regs->uregs[15] = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 			fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 			regs->uregs[0] = regs->orig_r0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 			regs->ipc -= 0x4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) asmlinkage void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) do_notify_resume(struct pt_regs *regs, unsigned int thread_flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 	if (thread_flags & _TIF_SIGPENDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 		do_signal(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	if (thread_flags & _TIF_NOTIFY_RESUME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 		tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }