1/* Copyright (C) 1999-2022 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   In addition to the permissions in the GNU Lesser General Public
10   License, the Free Software Foundation gives you unlimited
11   permission to link the compiled version of this file with other
12   programs, and to distribute those programs without any restriction
13   coming from the use of this file. (The GNU Lesser General Public
14   License restrictions do apply in other respects; for example, they
15   cover modification of the file, and distribution when not linked
16   into another program.)
17
18   Note that people who make modified versions of this file are not
19   obligated to grant this special exception for their modified
20   versions; it is their choice whether to do so. The GNU Lesser
21   General Public License gives permission to release a modified
22   version without this exception; this exception also makes it
23   possible to release a modified version which carries forward this
24   exception.
25
26   The GNU C Library is distributed in the hope that it will be useful,
27   but WITHOUT ANY WARRANTY; without even the implied warranty of
28   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
29   Lesser General Public License for more details.
30
31   You should have received a copy of the GNU Lesser General Public
32   License along with the GNU C Library; if not, see
33   <https://www.gnu.org/licenses/>.  */
34
35#include <sysdep.h>
36
37#include <asm/fpu.h>
38
39/*
40 * Arguments for __libc_start_main:
41 *	out0:	main
42 *	out1:	argc
43 *	out2:	argv
44 *	out3:	init
45 *	out4:	fini
46 *	out5:	rtld_fini
47 *	out6:	stack_end
48 */
49
50	.align 32
51	.global _start
52
53	.proc _start
54	.type _start,@function
55_start:
56	.prologue
57	.save rp, r0
58	.body
59	.prologue
60	{ .mlx
61	  alloc r2 = ar.pfs,0,0,7,0
62	  movl r3 = FPSR_DEFAULT
63	}
64	{ .mlx
65	  adds out2 = 16, sp	/* get address of argc value */
66	  movl gp = @gprel(0f)
67	  ;;
68	}
690:	{ .mmi
70	  ld8 out1 = [out2], 8	/* load argc and move out2 to become argv */
71	  mov.m r10 = ar.bsp	/* fetch rbs base address */
72	  mov r9 = ip
73	  ;;
74	}
75	{ .mii
76	  mov ar.fpsr = r3
77	  sub gp = r9, gp	/* back-compute gp value */
78	  adds out6 = 16, sp	/* highest non-environment stack address */
79	  ;;
80	}
81	{
82	  addl r11 = @ltoff(__libc_ia64_register_backing_store_base), gp
83	  addl out0 = @ltoff(@fptr(main)), gp
84	  mov out3 = r0		/* Used to be init.  */
85	  ;;
86	}
87	{ .mmi
88	  ld8 r3 = [r11]	/* pointer to __libc_ia64_register_backing_store_base */
89	  ld8 out0 = [out0]	/* pointer to `main' function descriptor */
90	  mov out4 = r0		/* Used to be fini.  */
91	  ;;
92	}
93	.body
94	{ .mib
95	  st8 [r3] = r10
96	  mov out5 = ret0	/* dynamic linker destructor */
97	  br.call.sptk.few rp = __libc_start_main
98	}
99	{ .mib
100	  break 0	/* break miserably if we ever return */
101	}
102	.endp _start
103
104/* Define a symbol for the first piece of initialized data.  */
105	.data
106	.globl __data_start
107__data_start:
108	.long 0
109	.weak data_start
110	data_start = __data_start
111
112	.common __libc_ia64_register_backing_store_base, 8, 8
113