Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *  Port on Texas Instruments TMS320C6x architecture
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *  Updated for 2.6.34: Mark Salter <msalter@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) 
^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/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <asm/ucontext.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * Do a signal return, undo the signal stack.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define RETCODE_SIZE (9 << 2)	/* 9 instructions = 36 bytes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) struct rt_sigframe {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	struct siginfo __user *pinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	void __user *puc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct siginfo info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct ucontext uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	unsigned long retcode[RETCODE_SIZE >> 2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static int restore_sigcontext(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 			      struct sigcontext __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	/* The access_ok check was done by caller, so use __get_user here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define COPY(x)  (err |= __get_user(regs->x, &sc->sc_##x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	COPY(a16); COPY(a17); COPY(a18); COPY(a19);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	COPY(a20); COPY(a21); COPY(a22); COPY(a23);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	COPY(a24); COPY(a25); COPY(a26); COPY(a27);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	COPY(a28); COPY(a29); COPY(a30); COPY(a31);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	COPY(b16); COPY(b17); COPY(b18); COPY(b19);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	COPY(b20); COPY(b21); COPY(b22); COPY(b23);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	COPY(b24); COPY(b25); COPY(b26); COPY(b27);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	COPY(b28); COPY(b29); COPY(b30); COPY(b31);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	COPY(csr); COPY(pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) #undef COPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) asmlinkage int do_rt_sigreturn(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	struct rt_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	/* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	 * Since we stacked the signal on a dword boundary,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	 * 'sp' should be dword aligned here.  If it's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	 * not, then the user is trying to mess with us.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (regs->sp & 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	frame = (struct rt_sigframe __user *) ((unsigned long) regs->sp + 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	return regs->a4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) static int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			    unsigned long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	err |= __put_user(mask, &sc->sc_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	/* The access_ok check was done by caller, so use __put_user here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) #define COPY(x) (err |= __put_user(regs->x, &sc->sc_##x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	COPY(sp); COPY(a4); COPY(b4); COPY(a6); COPY(b6); COPY(a8); COPY(b8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	COPY(a0); COPY(a1); COPY(a2); COPY(a3); COPY(a5); COPY(a7); COPY(a9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	COPY(b0); COPY(b1); COPY(b2); COPY(b3); COPY(b5); COPY(b7); COPY(b9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	COPY(a16); COPY(a17); COPY(a18); COPY(a19);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	COPY(a20); COPY(a21); COPY(a22); COPY(a23);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	COPY(a24); COPY(a25); COPY(a26); COPY(a27);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	COPY(a28); COPY(a29); COPY(a30); COPY(a31);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	COPY(b16); COPY(b17); COPY(b18); COPY(b19);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	COPY(b20); COPY(b21); COPY(b22); COPY(b23);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	COPY(b24); COPY(b25); COPY(b26); COPY(b27);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	COPY(b28); COPY(b29); COPY(b30); COPY(b31);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	COPY(csr); COPY(pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) #undef COPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) static inline void __user *get_sigframe(struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 					struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 					unsigned long framesize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	unsigned long sp = sigsp(regs->sp, ksig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	 * No matter what happens, 'sp' must be dword
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	 * aligned. Otherwise, nasty things will happen
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	return (void __user *)((sp - framesize) & ~7);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			  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_sigframe __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	unsigned long __user *retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	frame = get_sigframe(ksig, regs, sizeof(*frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	err |= __put_user(&frame->info, &frame->pinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	err |= __put_user(&frame->uc, &frame->puc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	err |= copy_siginfo_to_user(&frame->info, &ksig->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	/* Clear all the bits of the ucontext we don't use.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	err |= __clear_user(&frame->uc, offsetof(struct ucontext, uc_mcontext));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	err |= setup_sigcontext(&frame->uc.uc_mcontext,	regs, set->sig[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	/* Set up to return from userspace */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	retcode = (unsigned long __user *) &frame->retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	/* The access_ok check was done above, so use __put_user here */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) #define COPY(x) (err |= __put_user(x, retcode++))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	COPY(0x0000002AUL | (__NR_rt_sigreturn << 7));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 				/* MVK __NR_rt_sigreturn,B0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	COPY(0x10000000UL);	/* SWE */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	COPY(0x00006000UL);	/* NOP 4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	COPY(0x00006000UL);	/* NOP 4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	COPY(0x00006000UL);	/* NOP 4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	COPY(0x00006000UL);	/* NOP 4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	COPY(0x00006000UL);	/* NOP 4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	COPY(0x00006000UL);	/* NOP 4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	COPY(0x00006000UL);	/* NOP 4 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) #undef COPY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	flush_icache_range((unsigned long) &frame->retcode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			   (unsigned long) &frame->retcode + RETCODE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	retcode = (unsigned long __user *) &frame->retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	/* Change user context to branch to signal handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	regs->sp = (unsigned long) frame - 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	regs->b3 = (unsigned long) retcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	/* Give the signal number to the handler */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	regs->a4 = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	 * For realtime signals we must also set the second and third
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	 * arguments for the signal handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	 *   -- Peter Maydell <pmaydell@chiark.greenend.org.uk> 2000-12-06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	regs->b4 = (unsigned long)&frame->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	regs->a6 = (unsigned long)&frame->uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) handle_restart(struct pt_regs *regs, struct k_sigaction *ka, int has_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	switch (regs->a4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		if (!has_handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 			goto do_restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		regs->a4 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		if (has_handler && !(ka->sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 			regs->a4 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) do_restart:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		regs->a4 = regs->orig_a4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)  * handle the actual delivery of a signal to userspace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) static void handle_signal(struct ksignal *ksig, struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 			  int syscall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	/* Are we from a system call? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (syscall) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		/* If so, check system call restarting.. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		switch (regs->a4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			regs->a4 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 				regs->a4 = -EINTR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 			fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 			regs->a4 = regs->orig_a4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	/* Set up the stack frame */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	ret = setup_rt_frame(ksig, sigmask_to_save(), regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	signal_setup_done(ret, ksig, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)  * handle a potential signal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static void do_signal(struct pt_regs *regs, int syscall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	struct ksignal ksig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	/* we want the common case to go fast, which is why we may in certain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	 * cases get here from kernel mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	if (!user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	if (get_signal(&ksig)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 		handle_signal(&ksig, regs, syscall);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	/* did we come from a system call? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	if (syscall) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		/* restart the system call - no handlers present */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		switch (regs->a4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		case -ERESTARTNOHAND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 		case -ERESTARTSYS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 		case -ERESTARTNOINTR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 			regs->a4 = regs->orig_a4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		case -ERESTART_RESTARTBLOCK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			regs->a4 = regs->orig_a4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			regs->b0 = __NR_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 			regs->pc -= 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	/* if there's no signal to deliver, we just put the saved sigmask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	 * back */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	restore_saved_sigmask();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)  * notification of userspace execution resumption
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)  * - triggered by current->work.notify_resume
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) asmlinkage void do_notify_resume(struct pt_regs *regs, u32 thread_info_flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 				 int syscall)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	/* deal with pending signal delivery */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	if (thread_info_flags & (1 << TIF_SIGPENDING))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 		do_signal(regs, syscall);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	if (thread_info_flags & (1 << TIF_NOTIFY_RESUME))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		tracehook_notify_resume(regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }