Release 4.14 arch/powerpc/kernel/signal_32.c

/*
 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 * Copyright (C) 2001 IBM
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
 *
 *  Derived from "arch/i386/kernel/signal.c"
 *    Copyright (C) 1991, 1992 Linus Torvalds
 *    1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/elf.h>
#include <linux/ptrace.h>
#include <linux/ratelimit.h>
#ifdef CONFIG_PPC64
#include <linux/syscalls.h>
#include <linux/compat.h>
#else
#include <linux/wait.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#endif

#include <linux/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/syscalls.h>
#include <asm/sigcontext.h>
#include <asm/vdso.h>
#include <asm/switch_to.h>
#include <asm/tm.h>
#include <asm/asm-prototypes.h>
#ifdef CONFIG_PPC64
#include "ppc32.h"
#include <asm/unistd.h>
#else
#include <asm/ucontext.h>
#include <asm/pgtable.h>
#endif

#include "signal.h"


#ifdef CONFIG_PPC64

#define sys_rt_sigreturn	compat_sys_rt_sigreturn

#define sys_swapcontext	compat_sys_swapcontext

#define sys_sigreturn	compat_sys_sigreturn


#define old_sigaction	old_sigaction32

#define sigcontext	sigcontext32

#define mcontext	mcontext32

#define ucontext	ucontext32


#define __save_altstack __compat_save_altstack

/*
 * Userspace code may pass a ucontext which doesn't include VSX added
 * at the end.  We need to check for this case.
 */

#define UCONTEXTSIZEWITHOUTVSX \
		(sizeof(struct ucontext) - sizeof(elf_vsrreghalf_t32))

/*
 * Returning 0 means we return to userspace via
 * ret_from_except and thus restore all user
 * registers from *regs.  This is what we need
 * to do when a signal has been delivered.
 */


#define GP_REGS_SIZE	min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))

#undef __SIGNAL_FRAMESIZE

#define __SIGNAL_FRAMESIZE	__SIGNAL_FRAMESIZE32

#undef ELF_NVRREG

#define ELF_NVRREG	ELF_NVRREG32

/*
 * Functions for flipping sigsets (thanks to brain dead generic
 * implementation that makes things simple for little endian only)
 */


static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
{
	compat_sigset_t	cset;

	switch (_NSIG_WORDS) {
	case 4: cset.sig[6] = set->sig[3] & 0xffffffffull;
		cset.sig[7] = set->sig[3] >> 32;
	case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
		cset.sig[5] = set->sig[2] >> 32;
	case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
		cset.sig[3] = set->sig[1] >> 32;
	case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
		cset.sig[1] = set->sig[0] >> 32;
	}
	return copy_to_user(uset, &cset, sizeof(*uset));
}

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static inline int get_sigset_t(sigset_t *set,
			       const compat_sigset_t __user *uset)
{
	compat_sigset_t s32;

	if (copy_from_user(&s32, uset, sizeof(*uset)))
		return -EFAULT;

	/*
         * Swap the 2 words of the 64-bit sigset_t (they are stored
         * in the "wrong" endian in 32-bit user storage).
         */
	switch (_NSIG_WORDS) {
	case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
	case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
	case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
	case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
	}
	return 0;
}

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#define to_user_ptr(p)		ptr_to_compat(p)

#define from_user_ptr(p)	compat_ptr(p)



static inline int save_general_regs(struct pt_regs *regs,
		struct mcontext __user *frame)
{
	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
	int i;

	WARN_ON(!FULL_REGS(regs));

	for (i = 0; i <= PT_RESULT; i ++) {
		if (i == 14 && !FULL_REGS(regs))
			i = 32;
		if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
			return -EFAULT;
	}
	return 0;
}

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static inline int restore_general_regs(struct pt_regs *regs,
		struct mcontext __user *sr)
{
	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
	int i;

	for (i = 0; i <= PT_RESULT; i++) {
		if ((i == PT_MSR) || (i == PT_SOFTE))
			continue;
		if (__get_user(gregs[i], &sr->mc_gregs[i]))
			return -EFAULT;
	}
	return 0;
}

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#else /* CONFIG_PPC64 */


#define GP_REGS_SIZE	min(sizeof(elf_gregset_t), sizeof(struct pt_regs))



static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
{
	return copy_to_user(uset, set, sizeof(*uset));
}

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static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
{
	return copy_from_user(set, uset, sizeof(*uset));
}

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#define to_user_ptr(p)		((unsigned long)(p))

#define from_user_ptr(p)	((void __user *)(p))



static inline int save_general_regs(struct pt_regs *regs,
		struct mcontext __user *frame)
{
	WARN_ON(!FULL_REGS(regs));
	return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
}

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static inline int restore_general_regs(struct pt_regs *regs,
		struct mcontext __user *sr)
{
	/* copy up to but not including MSR */
	if (__copy_from_user(regs, &sr->mc_gregs,
				PT_MSR * sizeof(elf_greg_t)))
		return -EFAULT;
	/* copy from orig_r3 (the word after the MSR) up to the end */
	if (__copy_from_user(&regs->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
				GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
		return -EFAULT;
	return 0;
}
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#endif

/*
 * When we have signals to deliver, we set up on the
 * user stack, going down from the original stack pointer:
 *      an ABI gap of 56 words
 *      an mcontext struct
 *      a sigcontext struct
 *      a gap of __SIGNAL_FRAMESIZE bytes
 *
 * Each of these things must be a multiple of 16 bytes in size. The following
 * structure represent all of this except the __SIGNAL_FRAMESIZE gap
 *
 */

struct sigframe {
	
struct sigcontext sctx;		/* the sigcontext */
	
struct mcontext	mctx;		/* all the register values */
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	
struct sigcontext sctx_transact;
	
struct mcontext	mctx_transact;
#endif
	/*
         * Programs using the rs6000/xcoff abi can save up to 19 gp
         * regs and 18 fp regs below sp before decrementing it.
         */
	
int			abigap[56];
};

/* We use the mc_pad field for the signal return trampoline. */

#define tramp	mc_pad

/*
 *  When we have rt signals to deliver, we set up on the
 *  user stack, going down from the original stack pointer:
 *      one rt_sigframe struct (siginfo + ucontext + ABI gap)
 *      a gap of __SIGNAL_FRAMESIZE+16 bytes
 *  (the +16 is to get the siginfo and ucontext in the same
 *  positions as in older kernels).
 *
 *  Each of these things must be a multiple of 16 bytes in size.
 *
 */

struct rt_sigframe {
#ifdef CONFIG_PPC64
	
compat_siginfo_t info;
#else
	struct siginfo info;
#endif
	
struct ucontext	uc;
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	
struct ucontext	uc_transact;
#endif
	/*
         * Programs using the rs6000/xcoff abi can save up to 19 gp
         * regs and 18 fp regs below sp before decrementing it.
         */
	
int			abigap[56];
};

#ifdef CONFIG_VSX


unsigned long copy_fpr_to_user(void __user *to,
			       struct task_struct *task)
{
	u64 buf[ELF_NFPREG];
	int i;

	/* save FPR copy to local buffer then write to the thread_struct */
	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
		buf[i] = task->thread.TS_FPR(i);
	buf[i] = task->thread.fp_state.fpscr;
	return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
}

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unsigned long copy_fpr_from_user(struct task_struct *task,
				 void __user *from)
{
	u64 buf[ELF_NFPREG];
	int i;

	if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
		return 1;
	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
		task->thread.TS_FPR(i) = buf[i];
	task->thread.fp_state.fpscr = buf[i];

	return 0;
}

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unsigned long copy_vsx_to_user(void __user *to,
			       struct task_struct *task)
{
	u64 buf[ELF_NVSRHALFREG];
	int i;

	/* save FPR copy to local buffer then write to the thread_struct */
	for (i = 0; i < ELF_NVSRHALFREG; i++)
		buf[i] = task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
	return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
}

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unsigned long copy_vsx_from_user(struct task_struct *task,
				 void __user *from)
{
	u64 buf[ELF_NVSRHALFREG];
	int i;

	if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
		return 1;
	for (i = 0; i < ELF_NVSRHALFREG ; i++)
		task->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
	return 0;
}

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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM


unsigned long copy_ckfpr_to_user(void __user *to,
				  struct task_struct *task)
{
	u64 buf[ELF_NFPREG];
	int i;

	/* save FPR copy to local buffer then write to the thread_struct */
	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
		buf[i] = task->thread.TS_CKFPR(i);
	buf[i] = task->thread.ckfp_state.fpscr;
	return __copy_to_user(to, buf, ELF_NFPREG * sizeof(double));
}

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unsigned long copy_ckfpr_from_user(struct task_struct *task,
					  void __user *from)
{
	u64 buf[ELF_NFPREG];
	int i;

	if (__copy_from_user(buf, from, ELF_NFPREG * sizeof(double)))
		return 1;
	for (i = 0; i < (ELF_NFPREG - 1) ; i++)
		task->thread.TS_CKFPR(i) = buf[i];
	task->thread.ckfp_state.fpscr = buf[i];

	return 0;
}

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Paul Mackerras
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1
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Cyril Bur
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Anton Blanchard
1
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unsigned long copy_ckvsx_to_user(void __user *to,
				  struct task_struct *task)
{
	u64 buf[ELF_NVSRHALFREG];
	int i;

	/* save FPR copy to local buffer then write to the thread_struct */
	for (i = 0; i < ELF_NVSRHALFREG; i++)
		buf[i] = task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
	return __copy_to_user(to, buf, ELF_NVSRHALFREG * sizeof(double));
}

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unsigned long copy_ckvsx_from_user(struct task_struct *task,
					  void __user *from)
{
	u64 buf[ELF_NVSRHALFREG];
	int i;

	if (__copy_from_user(buf, from, ELF_NVSRHALFREG * sizeof(double)))
		return 1;
	for (i = 0; i < ELF_NVSRHALFREG ; i++)
		task->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
	return 0;
}
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#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
#else


inline unsigned long copy_fpr_to_user(void __user *to,
				      struct task_struct *task)
{
	return __copy_to_user(to, task->thread.fp_state.fpr,
			      ELF_NFPREG * sizeof(double));
}

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inline unsigned long copy_fpr_from_user(struct task_struct *task,
					void __user *from)
{
	return __copy_from_user(task->thread.fp_state.fpr, from,
			      ELF_NFPREG * sizeof(double));
}

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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM


inline unsigned long copy_ckfpr_to_user(void __user *to,
					 struct task_struct *task)
{
	return __copy_to_user(to, task->thread.ckfp_state.fpr,
			      ELF_NFPREG * sizeof(double));
}

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inline unsigned long copy_ckfpr_from_user(struct task_struct *task,
						 void __user *from)
{
	return __copy_from_user(task->thread.ckfp_state.fpr, from,
				ELF_NFPREG * sizeof(double));
}
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#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
#endif

/*
 * Save the current user registers on the user stack.
 * We only save the altivec/spe registers if the process has used
 * altivec/spe instructions at some point.
 */


static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
			  struct mcontext __user *tm_frame, int sigret,
			  int ctx_has_vsx_region)
{
	unsigned long msr = regs->msr;

	/* Make sure floating point registers are stored in regs */
	flush_fp_to_thread(current);

	/* save general registers */
	if (save_general_regs(regs, frame))
		return 1;

#ifdef CONFIG_ALTIVEC
	/* save altivec registers */
	if (current->thread.used_vr) {
		flush_altivec_to_thread(current);
		if (__copy_to_user(&frame->mc_vregs, &current->thread.vr_state,
				   ELF_NVRREG * sizeof(vector128)))
			return 1;
		/* set MSR_VEC in the saved MSR value to indicate that
                   frame->mc_vregs contains valid data */
		msr |= MSR_VEC;
	}
	/* else assert((regs->msr & MSR_VEC) == 0) */

	/* We always copy to/from vrsave, it's 0 if we don't have or don't
         * use altivec. Since VSCR only contains 32 bits saved in the least
         * significant bits of a vector, we "cheat" and stuff VRSAVE in the
         * most significant bits of that same vector. --BenH
         * Note that the current VRSAVE value is in the SPR at this point.
         */
	if (cpu_has_feature(CPU_FTR_ALTIVEC))
		current->thread.vrsave = mfspr(SPRN_VRSAVE);
	if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
		return 1;
#endif /* CONFIG_ALTIVEC */
	if (copy_fpr_to_user(&frame->mc_fregs, current))
		return 1;

	/*
         * Clear the MSR VSX bit to indicate there is no valid state attached
         * to this context, except in the specific case below where we set it.
         */
	msr &= ~MSR_VSX;
#ifdef CONFIG_VSX
	/*
         * Copy VSR 0-31 upper half from thread_struct to local
         * buffer, then write that to userspace.  Also set MSR_VSX in
         * the saved MSR value to indicate that frame->mc_vregs
         * contains valid data
         */
	if (current->thread.used_vsr && ctx_has_vsx_region) {
		flush_vsx_to_thread(current);
		if (copy_vsx_to_user(&frame->mc_vsregs, current))
			return 1;
		msr |= MSR_VSX;
	}
#endif /* CONFIG_VSX */
#ifdef CONFIG_SPE
	/* save spe registers */
	if (current->thread.used_spe) {
		flush_spe_to_thread(current);
		if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
				   ELF_NEVRREG * sizeof(u32)))
			return 1;
		/* set MSR_SPE in the saved MSR value to indicate that
                   frame->mc_vregs contains valid data */
		msr |= MSR_SPE;
	}
	/* else assert((regs->msr & MSR_SPE) == 0) */

	/* We always copy to/from spefscr */
	if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
		return 1;
#endif /* CONFIG_SPE */

	if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
		return 1;
	/* We need to write 0 the MSR top 32 bits in the tm frame so that we
         * can check it on the restore to see if TM is active
         */
	if (tm_frame && __put_user(0, &tm_frame->mc_gregs[PT_MSR]))
		return 1;

	if (sigret) {
		/* Set up the sigreturn trampoline: li r0,sigret; sc */
		if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
		    || __put_user(0x44000002UL, &frame->tramp[1]))
			return 1;
		flush_icache_range((unsigned long) &frame->tramp[0],
				   (unsigned long) &frame->tramp[2]);
	}

	return 0;
}

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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/*
 * Save the current user registers on the user stack.
 * We only save the altivec/spe registers if the process has used
 * altivec/spe instructions at some point.
 * We also save the transactional registers to a second ucontext in the
 * frame.
 *
 * See save_user_regs() and signal_64.c:setup_tm_sigcontexts().
 */


static int save_tm_user_regs(struct pt_regs *regs,
			     struct mcontext __user *frame,
			     struct mcontext __user *tm_frame, int sigret)
{
	unsigned long msr = regs->msr;

	/* Remove TM bits from thread's MSR.  The MSR in the sigcontext
         * just indicates to userland that we were doing a transaction, but we
         * don't want to return in transactional state.  This also ensures
         * that flush_fp_to_thread won't set TIF_RESTORE_TM again.
         */
	regs->msr &= ~MSR_TS_MASK;

	/* Save both sets of general registers */
	if (save_general_regs(&current->thread.ckpt_regs, frame)
	    || save_general_regs(regs, tm_frame))
		return 1;

	/* Stash the top half of the 64bit MSR into the 32bit MSR word
         * of the transactional mcontext.  This way we have a backward-compatible
         * MSR in the 'normal' (checkpointed) mcontext and additionally one can
         * also look at what type of transaction (T or S) was active at the
         * time of the signal.
         */
	if (__put_user((msr >> 32), &tm_frame->mc_gregs[PT_MSR]))
		return 1;

#ifdef CONFIG_ALTIVEC
	/* save altivec registers */
	if (current->thread.used_vr) {
		if (__copy_to_user(&frame->mc_vregs, &current->thread.ckvr_state,
				   ELF_NVRREG * sizeof(vector128)))
			return 1;
		if (msr & MSR_VEC) {
			if (__copy_to_user(&tm_frame->mc_vregs,
					   &current->thread.vr_state,
					   ELF_NVRREG * sizeof(vector128)))
				return 1;
		} else {
			if (__copy_to_user(&tm_frame->mc_vregs,
					   &current->thread.ckvr_state,
					   ELF_NVRREG * sizeof(vector128)))
				return 1;
		}

		/* set MSR_VEC in the saved MSR value to indicate that
                 * frame->mc_vregs contains valid data
                 */
		msr |= MSR_VEC;
	}

	/* We always copy to/from vrsave, it's 0 if we don't have or don't
         * use altivec. Since VSCR only contains 32 bits saved in the least
         * significant bits of a vector, we "cheat" and stuff VRSAVE in the
         * most significant bits of that same vector. --BenH
         */
	if (cpu_has_feature(CPU_FTR_ALTIVEC))
		current->thread.ckvrsave = mfspr(SPRN_VRSAVE);
	if (__put_user(current->thread.ckvrsave,
		       (u32 __user *)&frame->mc_vregs[32]))
		return 1;
	if (msr & MSR_VEC) {
		if (__put_user(current->thread.vrsave,
			       (u32 __user *)&tm_frame->mc_vregs[32]))
			return 1;
	} else {
		if (__put_user(current->thread.ckvrsave,
			       (u32 __user *)&tm_frame->mc_vregs[32]))
			return 1;
	}
#endif /* CONFIG_ALTIVEC */

	if (copy_ckfpr_to_user(&frame->mc_fregs, current))
		return 1;
	if (msr & MSR_FP) {
		if (copy_fpr_to_user(&tm_frame->mc_fregs, current))
			return 1;
	} else {
		if (copy_ckfpr_to_user(&tm_frame->mc_fregs, current))
			return 1;
	}

#ifdef CONFIG_VSX
	/*
         * Copy VSR 0-31 upper half from thread_struct to local
         * buffer, then write that to userspace.  Also set MSR_VSX in
         * the saved MSR value to indicate that frame->mc_vregs
         * contains valid data
         */
	if (current->thread.used_vsr) {
		if (copy_ckvsx_to_user(&frame->mc_vsregs, current))
			return 1;
		if (msr & MSR_VSX) {
			if (copy_vsx_to_user(&tm_frame->mc_vsregs,
						      current))
				return 1;
		} else {
			if (copy_ckvsx_to_user(&tm_frame->mc_vsregs, current))
				return 1;
		}

		msr |= MSR_VSX;
	}
#endif /* CONFIG_VSX */
#ifdef CONFIG_SPE
	/* SPE regs are not checkpointed with TM, so this section is
         * simply the same as in save_user_regs().
         */
	if (current->thread.used_spe) {
		flush_spe_to_thread(current);
		if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
				   ELF_NEVRREG * sizeof(u32)))
			return 1;
		/* set MSR_SPE in the saved MSR value to indicate that
                 * frame->mc_vregs contains valid data */
		msr |= MSR_SPE;
	}

	/* We always copy to/from spefscr */
	if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
		return 1;
#endif /* CONFIG_SPE */

	if (__put_user(msr, &frame->mc_gregs[PT_MSR]))
		return 1;
	if (sigret) {
		/* Set up the sigreturn trampoline: li r0,sigret; sc */
		if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
		    || __put_user(0x44000002UL, &frame->tramp[1]))
			return 1;
		flush_icache_range((unsigned long) &frame->