[mirror_ubuntu-jammy-kernel.git] / arch / mips / kernel / signal-common.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1991, 1992  Linus Torvalds
 * Copyright (C) 1994 - 2000  Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */

#include <linux/config.h>

static inline int
setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
{
	int err = 0;

	err |= __put_user(regs->cp0_epc, &sc->sc_pc);

#define save_gp_reg(i) do {						\
	err |= __put_user(regs->regs[i], &sc->sc_regs[i]);		\
} while(0)
	__put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
	save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
	save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
	save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
	save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
	save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
	save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
	save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
	save_gp_reg(31);
#undef save_gp_reg

#ifdef CONFIG_32BIT
	err |= __put_user(regs->hi, &sc->sc_mdhi);
	err |= __put_user(regs->lo, &sc->sc_mdlo);
	if (cpu_has_dsp) {
		err |= __put_user(mfhi1(), &sc->sc_hi1);
		err |= __put_user(mflo1(), &sc->sc_lo1);
		err |= __put_user(mfhi2(), &sc->sc_hi2);
		err |= __put_user(mflo2(), &sc->sc_lo2);
		err |= __put_user(mfhi3(), &sc->sc_hi3);
		err |= __put_user(mflo3(), &sc->sc_lo3);
		err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
	}
#endif
#ifdef CONFIG_64BIT
	err |= __put_user(regs->hi, &sc->sc_hi[0]);
	err |= __put_user(regs->lo, &sc->sc_lo[0]);
	if (cpu_has_dsp) {
		err |= __put_user(mfhi1(), &sc->sc_hi[1]);
		err |= __put_user(mflo1(), &sc->sc_lo[1]);
		err |= __put_user(mfhi2(), &sc->sc_hi[2]);
		err |= __put_user(mflo2(), &sc->sc_lo[2]);
		err |= __put_user(mfhi3(), &sc->sc_hi[3]);
		err |= __put_user(mflo3(), &sc->sc_lo[3]);
		err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
	}
#endif

	err |= __put_user(!!used_math(), &sc->sc_used_math);

	if (!used_math())
		goto out;

	/*
	 * Save FPU state to signal context.  Signal handler will "inherit"
	 * current FPU state.
	 */
	preempt_disable();

	if (!is_fpu_owner()) {
		own_fpu();
		restore_fp(current);
	}
	err |= save_fp_context(sc);

	preempt_enable();

out:
	return err;
}

static inline int
restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
{
	unsigned int used_math;
	unsigned long treg;
	int err = 0;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	err |= __get_user(regs->cp0_epc, &sc->sc_pc);
#ifdef CONFIG_32BIT
	err |= __get_user(regs->hi, &sc->sc_mdhi);
	err |= __get_user(regs->lo, &sc->sc_mdlo);
	if (cpu_has_dsp) {
		err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
		err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
		err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
		err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
		err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
		err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
		err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
	}
#endif
#ifdef CONFIG_64BIT
	err |= __get_user(regs->hi, &sc->sc_hi[0]);
	err |= __get_user(regs->lo, &sc->sc_lo[0]);
	if (cpu_has_dsp) {
		err |= __get_user(treg, &sc->sc_hi[1]); mthi1(treg);
		err |= __get_user(treg, &sc->sc_lo[1]); mthi1(treg);
		err |= __get_user(treg, &sc->sc_hi[2]); mthi2(treg);
		err |= __get_user(treg, &sc->sc_lo[2]); mthi2(treg);
		err |= __get_user(treg, &sc->sc_hi[3]); mthi3(treg);
		err |= __get_user(treg, &sc->sc_lo[3]); mthi3(treg);
		err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
	}
#endif

#define restore_gp_reg(i) do {						\
	err |= __get_user(regs->regs[i], &sc->sc_regs[i]);		\
} while(0)
	restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
	restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
	restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
	restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
	restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
	restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
	restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
	restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
	restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
	restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
	restore_gp_reg(31);
#undef restore_gp_reg

	err |= __get_user(used_math, &sc->sc_used_math);
	conditional_used_math(used_math);

	preempt_disable();

	if (used_math()) {
		/* restore fpu context if we have used it before */
		own_fpu();
		err |= restore_fp_context(sc);
	} else {
		/* signal handler may have used FPU.  Give it up. */
		lose_fpu();
	}

	preempt_enable();

	return err;
}

/*
 * Determine which stack to use..
 */
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size)
{
	unsigned long sp;

	/* Default to using normal stack */
	sp = regs->regs[29];

	/*
 	 * FPU emulator may have it's own trampoline active just
 	 * above the user stack, 16-bytes before the next lowest
 	 * 16 byte boundary.  Try to avoid trashing it.
 	 */
 	sp -= 32;

	/* This is the X/Open sanctioned signal stack switching.  */
	if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
		sp = current->sas_ss_sp + current->sas_ss_size;

	return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
}

static inline int install_sigtramp(unsigned int __user *tramp,
	unsigned int syscall)
{
	int err;

	/*
	 * Set up the return code ...
	 *
	 *         li      v0, __NR__foo_sigreturn
	 *         syscall
	 */

	err = __put_user(0x24020000 + syscall, tramp + 0);
	err |= __put_user(0x0000000c          , tramp + 1);
	if (ICACHE_REFILLS_WORKAROUND_WAR) {
		err |= __put_user(0, tramp + 2);
		err |= __put_user(0, tramp + 3);
		err |= __put_user(0, tramp + 4);
		err |= __put_user(0, tramp + 5);
		err |= __put_user(0, tramp + 6);
		err |= __put_user(0, tramp + 7);
	}
	flush_cache_sigtramp((unsigned long) tramp);

	return err;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1991, 1992 Linus Torvalds
	7	* Copyright (C) 1994 - 2000 Ralf Baechle
	8	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	9	*/
	10
e50c0a8f RB	11	#include <linux/config.h>
e50c0a8f RB	12
1da177e4	13	static inline int
9bbf28a3	14	setup_sigcontext(struct pt_regs regs, struct sigcontext __user sc)
1da177e4 LT	15	{
	16	int err = 0;
	17
	18	err \|= __put_user(regs->cp0_epc, &sc->sc_pc);
1da177e4 LT	19
	20	#define save_gp_reg(i) do { \
	21	err \|= __put_user(regs->regs[i], &sc->sc_regs[i]); \
	22	} while(0)
	23	__put_user(0, &sc->sc_regs[0]); save_gp_reg(1); save_gp_reg(2);
	24	save_gp_reg(3); save_gp_reg(4); save_gp_reg(5); save_gp_reg(6);
	25	save_gp_reg(7); save_gp_reg(8); save_gp_reg(9); save_gp_reg(10);
	26	save_gp_reg(11); save_gp_reg(12); save_gp_reg(13); save_gp_reg(14);
	27	save_gp_reg(15); save_gp_reg(16); save_gp_reg(17); save_gp_reg(18);
	28	save_gp_reg(19); save_gp_reg(20); save_gp_reg(21); save_gp_reg(22);
	29	save_gp_reg(23); save_gp_reg(24); save_gp_reg(25); save_gp_reg(26);
	30	save_gp_reg(27); save_gp_reg(28); save_gp_reg(29); save_gp_reg(30);
	31	save_gp_reg(31);
	32	#undef save_gp_reg
	33
e50c0a8f	34	#ifdef CONFIG_32BIT
1da177e4 LT	35	err \|= __put_user(regs->hi, &sc->sc_mdhi);
1da177e4 LT	36	err \|= __put_user(regs->lo, &sc->sc_mdlo);
e50c0a8f RB	37	if (cpu_has_dsp) {
	38	err \|= __put_user(mfhi1(), &sc->sc_hi1);
	39	err \|= __put_user(mflo1(), &sc->sc_lo1);
	40	err \|= __put_user(mfhi2(), &sc->sc_hi2);
	41	err \|= __put_user(mflo2(), &sc->sc_lo2);
	42	err \|= __put_user(mfhi3(), &sc->sc_hi3);
	43	err \|= __put_user(mflo3(), &sc->sc_lo3);
	44	err \|= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
	45	}
	46	#endif
	47	#ifdef CONFIG_64BIT
	48	err \|= __put_user(regs->hi, &sc->sc_hi[0]);
	49	err \|= __put_user(regs->lo, &sc->sc_lo[0]);
	50	if (cpu_has_dsp) {
	51	err \|= __put_user(mfhi1(), &sc->sc_hi[1]);
	52	err \|= __put_user(mflo1(), &sc->sc_lo[1]);
	53	err \|= __put_user(mfhi2(), &sc->sc_hi[2]);
	54	err \|= __put_user(mflo2(), &sc->sc_lo[2]);
	55	err \|= __put_user(mfhi3(), &sc->sc_hi[3]);
	56	err \|= __put_user(mflo3(), &sc->sc_lo[3]);
	57	err \|= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
	58	}
	59	#endif
1da177e4 LT	60
	61	err \|= __put_user(!!used_math(), &sc->sc_used_math);
	62
	63	if (!used_math())
	64	goto out;
	65
	66	/*
	67	* Save FPU state to signal context. Signal handler will "inherit"
	68	* current FPU state.
	69	*/
	70	preempt_disable();
	71
	72	if (!is_fpu_owner()) {
	73	own_fpu();
	74	restore_fp(current);
	75	}
	76	err \|= save_fp_context(sc);
	77
	78	preempt_enable();
	79
	80	out:
	81	return err;
	82	}
	83
	84	static inline int
9bbf28a3	85	restore_sigcontext(struct pt_regs regs, struct sigcontext __user sc)
1da177e4	86	{
1da177e4	87	unsigned int used_math;
e50c0a8f RB	88	unsigned long treg;
e50c0a8f RB	89	int err = 0;
1da177e4 LT	90
	91	/* Always make any pending restarted system calls return -EINTR */
	92	current_thread_info()->restart_block.fn = do_no_restart_syscall;
	93
	94	err \|= __get_user(regs->cp0_epc, &sc->sc_pc);
e50c0a8f	95	#ifdef CONFIG_32BIT
1da177e4 LT	96	err \|= __get_user(regs->hi, &sc->sc_mdhi);
1da177e4 LT	97	err \|= __get_user(regs->lo, &sc->sc_mdlo);
e50c0a8f RB	98	if (cpu_has_dsp) {
	99	err \|= __get_user(treg, &sc->sc_hi1); mthi1(treg);
	100	err \|= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
	101	err \|= __get_user(treg, &sc->sc_hi2); mthi2(treg);
	102	err \|= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
	103	err \|= __get_user(treg, &sc->sc_hi3); mthi3(treg);
	104	err \|= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
	105	err \|= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
	106	}
	107	#endif
	108	#ifdef CONFIG_64BIT
	109	err \|= __get_user(regs->hi, &sc->sc_hi[0]);
	110	err \|= __get_user(regs->lo, &sc->sc_lo[0]);
	111	if (cpu_has_dsp) {
	112	err \|= __get_user(treg, &sc->sc_hi[1]); mthi1(treg);
	113	err \|= __get_user(treg, &sc->sc_lo[1]); mthi1(treg);
	114	err \|= __get_user(treg, &sc->sc_hi[2]); mthi2(treg);
	115	err \|= __get_user(treg, &sc->sc_lo[2]); mthi2(treg);
	116	err \|= __get_user(treg, &sc->sc_hi[3]); mthi3(treg);
	117	err \|= __get_user(treg, &sc->sc_lo[3]); mthi3(treg);
	118	err \|= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
	119	}
	120	#endif
1da177e4 LT	121
	122	#define restore_gp_reg(i) do { \
	123	err \|= __get_user(regs->regs[i], &sc->sc_regs[i]); \
	124	} while(0)
	125	restore_gp_reg( 1); restore_gp_reg( 2); restore_gp_reg( 3);
	126	restore_gp_reg( 4); restore_gp_reg( 5); restore_gp_reg( 6);
	127	restore_gp_reg( 7); restore_gp_reg( 8); restore_gp_reg( 9);
	128	restore_gp_reg(10); restore_gp_reg(11); restore_gp_reg(12);
	129	restore_gp_reg(13); restore_gp_reg(14); restore_gp_reg(15);
	130	restore_gp_reg(16); restore_gp_reg(17); restore_gp_reg(18);
	131	restore_gp_reg(19); restore_gp_reg(20); restore_gp_reg(21);
	132	restore_gp_reg(22); restore_gp_reg(23); restore_gp_reg(24);
	133	restore_gp_reg(25); restore_gp_reg(26); restore_gp_reg(27);
	134	restore_gp_reg(28); restore_gp_reg(29); restore_gp_reg(30);
	135	restore_gp_reg(31);
	136	#undef restore_gp_reg
	137
	138	err \|= __get_user(used_math, &sc->sc_used_math);
	139	conditional_used_math(used_math);
	140
	141	preempt_disable();
	142
	143	if (used_math()) {
	144	/* restore fpu context if we have used it before */
	145	own_fpu();
	146	err \|= restore_fp_context(sc);
	147	} else {
	148	/* signal handler may have used FPU. Give it up. */
	149	lose_fpu();
	150	}
	151
	152	preempt_enable();
	153
	154	return err;
	155	}
	156
	157	/*
	158	* Determine which stack to use..
	159	*/
9bbf28a3	160	static inline void __user *
1da177e4 LT	161	get_sigframe(struct k_sigaction ka, struct pt_regs regs, size_t frame_size)
1da177e4 LT	162	{
02416dcf	163	unsigned long sp;
1da177e4 LT	164
	165	/* Default to using normal stack */
	166	sp = regs->regs[29];
	167
	168	/*
	169	* FPU emulator may have it's own trampoline active just
	170	* above the user stack, 16-bytes before the next lowest
	171	* 16 byte boundary. Try to avoid trashing it.
	172	*/
	173	sp -= 32;
	174
	175	/* This is the X/Open sanctioned signal stack switching. */
	176	if ((ka->sa.sa_flags & SA_ONSTACK) && (sas_ss_flags (sp) == 0))
	177	sp = current->sas_ss_sp + current->sas_ss_size;
	178
387a154d	179	return (void __user *)((sp - frame_size) & (ICACHE_REFILLS_WORKAROUND_WAR ? ~(cpu_icache_line_size()-1) : ALMASK));
02416dcf RB	180	}
	181
	182	static inline int install_sigtramp(unsigned int __user *tramp,
	183	unsigned int syscall)
	184	{
	185	int err;
1da177e4	186
02416dcf RB	187	/*
	188	* Set up the return code ...
	189	*
	190	* li v0, __NR__foo_sigreturn
	191	* syscall
	192	*/
	193
	194	err = __put_user(0x24020000 + syscall, tramp + 0);
	195	err \|= __put_user(0x0000000c , tramp + 1);
	196	if (ICACHE_REFILLS_WORKAROUND_WAR) {
	197	err \|= __put_user(0, tramp + 2);
	198	err \|= __put_user(0, tramp + 3);
	199	err \|= __put_user(0, tramp + 4);
	200	err \|= __put_user(0, tramp + 5);
	201	err \|= __put_user(0, tramp + 6);
	202	err \|= __put_user(0, tramp + 7);
	203	}
	204	flush_cache_sigtramp((unsigned long) tramp);
	205
	206	return err;
1da177e4	207	}