1/* Copyright (C) 2009-2022 Free Software Foundation, Inc.
2   This file is part of the GNU C Library.
3
4   The GNU C Library is free software; you can redistribute it and/or
5   modify it under the terms of the GNU Lesser General Public
6   License as published by the Free Software Foundation; either
7   version 2.1 of the License, or (at your option) any later version.
8
9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library; if not, see
16   <https://www.gnu.org/licenses/>.  */
17
18/* longjmp is implemented in terms of the setcontext trap on Linux/Sparc64.  */
19
20#include <sysdep.h>
21
22/* Offsets into the jmp_buf structure.  */
23
24#define O_mask_was_saved	512
25#define O_gregs			32
26#define O_g1			(O_gregs + 4*8)
27#define O_sp			(O_gregs + 17*8)
28
29.section .rodata.str1.1,"aMS",@progbits,1
30	.type	longjmp_msg,@object
31longjmp_msg:
32	.string "longjmp causes uninitialized stack frame"
33	.size	longjmp_msg, .-longjmp_msg
34
35	.text
36ENTRY (____longjmp_chk)
37	ldx	[%o0 + O_sp], %o2
38	cmp	%sp, %o2
39	bleu,pt	%xcc, .Lok
40	 nop
41
42	save	%sp, -208, %sp
43	cfi_remember_state
44	cfi_def_cfa_register(%fp)
45	cfi_window_save
46	cfi_register(%o7, %i7)
47	add	%fp, 2023, %o1
48	clr	%o0
49	LOADSYSCALL(sigaltstack)
50	ta	0x6d
51	bcs,pn	%xcc, .Lok2
52	 lduw	[%fp + 2031], %l2
53	andcc	%l2, 0x1, %g0
54	be,pn	%xcc, .Lfail
55	 ldx	[%fp + 2023], %l0
56	ldx	[%fp + 2039], %l1
57	sub	%l0, STACK_BIAS, %l0
58	add	%l0, %l1, %l0
59	sub	%l0, %i2, %l0
60	cmp	%l0, %l1
61	bgeu,pt	%xcc, .Lok2
62	 nop
63
64.Lfail:
65#ifndef PIC
66	sethi	%hi(longjmp_msg), %o0
67	or	%o0, %lo(longjmp_msg), %o0
68#else
69	SETUP_PIC_REG(l7)
70	sethi	%gdop_hix22(longjmp_msg), %o0
71	xor	%o0, %gdop_lox10(longjmp_msg), %o0
72	ldx	[%l7 + %o0], %o0, %gdop(longjmp_msg)
73#endif
74	call	HIDDEN_JUMPTARGET(__fortify_fail)
75	 nop
76
77.Lok2:	restore
78	cfi_restore_state
79
80.Lok:
81	/* Modify the context with the value we want to return.  */
82	movre	%o1, 1, %o1
83	stx	%o1, [%o0 + O_g1]
84
85	/* Let setcontext know if we want to modify the current sigmask. */
86	ld	[%o0 + O_mask_was_saved], %o1
87
88	/* And bamf back to where we belong!  */
89	ta	0x6f
90END(____longjmp_chk)
91