Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Copyright (C) 1994 - 2000, 2006  Ralf Baechle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Copyright (C) 2016, Imagination Technologies Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/sched/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <asm/abi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <asm/compat-signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <asm/dsp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <asm/sim.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <asm/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include "signal-common.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #define __NR_O32_restart_syscall	4253
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) struct sigframe32 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	u32 sf_ass[4];		/* argument save space for o32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	u32 sf_pad[2];		/* Was: signal trampoline */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	struct sigcontext32 sf_sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	compat_sigset_t sf_mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) struct ucontext32 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	u32		    uc_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	s32		    uc_link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	compat_stack_t      uc_stack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	struct sigcontext32 uc_mcontext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	compat_sigset_t	    uc_sigmask;	  /* mask last for extensibility */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) struct rt_sigframe32 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	u32 rs_ass[4];			/* argument save space for o32 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	u32 rs_pad[2];			/* Was: signal trampoline */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	compat_siginfo_t rs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct ucontext32 rs_uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) static int setup_sigcontext32(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			      struct sigcontext32 __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	err |= __put_user(regs->cp0_epc, &sc->sc_pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	err |= __put_user(0, &sc->sc_regs[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	for (i = 1; i < 32; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		err |= __put_user(regs->regs[i], &sc->sc_regs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	err |= __put_user(regs->hi, &sc->sc_mdhi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	err |= __put_user(regs->lo, &sc->sc_mdlo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	if (cpu_has_dsp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		err |= __put_user(mfhi1(), &sc->sc_hi1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		err |= __put_user(mflo1(), &sc->sc_lo1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		err |= __put_user(mfhi2(), &sc->sc_hi2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		err |= __put_user(mflo2(), &sc->sc_lo2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		err |= __put_user(mfhi3(), &sc->sc_hi3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		err |= __put_user(mflo3(), &sc->sc_lo3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	 * Save FPU state to signal context.  Signal handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	 * will "inherit" current FPU state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	err |= protected_save_fp_context(sc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static int restore_sigcontext32(struct pt_regs *regs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 				struct sigcontext32 __user *sc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	s32 treg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	/* Always make any pending restarted system calls return -EINTR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	current->restart_block.fn = do_no_restart_syscall;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	err |= __get_user(regs->cp0_epc, &sc->sc_pc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	err |= __get_user(regs->hi, &sc->sc_mdhi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	err |= __get_user(regs->lo, &sc->sc_mdlo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (cpu_has_dsp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 		err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 		err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	for (i = 1; i < 32; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 		err |= __get_user(regs->regs[i], &sc->sc_regs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	return err ?: protected_restore_fp_context(sc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int setup_frame_32(void *sig_return, struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 			  struct pt_regs *regs, sigset_t *set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	struct sigframe32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	frame = get_sigframe(ksig, regs, sizeof(*frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	if (!access_ok(frame, sizeof (*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	err |= setup_sigcontext32(regs, &frame->sf_sc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	 * Arguments to signal handler:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	 *   a0 = signal number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	 *   a1 = 0 (should be cause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	 *   a2 = pointer to struct sigcontext
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	 * $25 and c0_epc point to the signal handler, $29 points to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	 * struct sigframe.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	regs->regs[ 4] = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	regs->regs[ 5] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	regs->regs[ 6] = (unsigned long) &frame->sf_sc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	regs->regs[29] = (unsigned long) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	regs->regs[31] = (unsigned long) sig_return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	       current->comm, current->pid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	       frame, regs->cp0_epc, regs->regs[31]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) asmlinkage void sys32_rt_sigreturn(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	struct rt_sigframe32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	struct pt_regs *regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	sigset_t set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	int sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	frame = (struct rt_sigframe32 __user *)regs->regs[29];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	set_current_blocked(&set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	sig = restore_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (sig < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	else if (sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		force_sig(sig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	if (compat_restore_altstack(&frame->rs_uc.uc_stack))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	 * Don't let your children do this ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	__asm__ __volatile__(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		"move\t$29, %0\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		"j\tsyscall_exit"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 		: /* no outputs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		: "r" (regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	/* Unreached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static int setup_rt_frame_32(void *sig_return, struct ksignal *ksig,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			     struct pt_regs *regs, sigset_t *set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	struct rt_sigframe32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	frame = get_sigframe(ksig, regs, sizeof(*frame));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (!access_ok(frame, sizeof (*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	/* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	/* Create the ucontext.	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	err |= __put_user(0, &frame->rs_uc.uc_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	err |= __put_user(0, &frame->rs_uc.uc_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	 * Arguments to signal handler:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	 *   a0 = signal number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	 *   a1 = 0 (should be cause)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	 *   a2 = pointer to ucontext
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	 * $25 and c0_epc point to the signal handler, $29 points to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	 * the struct rt_sigframe32.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	regs->regs[ 4] = ksig->sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	regs->regs[ 5] = (unsigned long) &frame->rs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	regs->regs[29] = (unsigned long) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	regs->regs[31] = (unsigned long) sig_return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	       current->comm, current->pid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	       frame, regs->cp0_epc, regs->regs[31]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)  * o32 compatibility on 64-bit kernels, without DSP ASE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct mips_abi mips_abi_32 = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	.setup_frame	= setup_frame_32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	.setup_rt_frame = setup_rt_frame_32,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	.restart	= __NR_O32_restart_syscall,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	.off_sc_fpregs = offsetof(struct sigcontext32, sc_fpregs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	.off_sc_fpc_csr = offsetof(struct sigcontext32, sc_fpc_csr),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	.off_sc_used_math = offsetof(struct sigcontext32, sc_used_math),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	.vdso		= &vdso_image_o32,
^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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) asmlinkage void sys32_sigreturn(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	struct sigframe32 __user *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	struct pt_regs *regs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	sigset_t blocked;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	int sig;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	regs = current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	frame = (struct sigframe32 __user *)regs->regs[29];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	if (!access_ok(frame, sizeof(*frame)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	set_current_blocked(&blocked);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	sig = restore_sigcontext32(regs, &frame->sf_sc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (sig < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		goto badframe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	else if (sig)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		force_sig(sig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	 * Don't let your children do this ...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	__asm__ __volatile__(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 		"move\t$29, %0\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		"j\tsyscall_exit"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		: /* no outputs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		: "r" (regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	/* Unreached */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) badframe:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	force_sig(SIGSEGV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) }