1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/* Copyright (C) 1997-2017 Free Software Foundation, Inc.
Contributed by Richard Henderson <richard@gnu.ai.mit.edu>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _LINUX_SPARC64_SYSDEP_H
#define _LINUX_SPARC64_SYSDEP_H 1
#include <common/sysdep.h>
#undef SYS_ify
#define SYS_ify(syscall_name) __NR_##syscall_name
#ifdef __ASSEMBLER__
#define SPARC_PIC_THUNK(reg) \
.ifndef __sparc_get_pc_thunk.reg; \
.section .text.__sparc_get_pc_thunk.reg,"axG",@progbits,__sparc_get_pc_thunk.reg,comdat; \
.align 32; \
.weak __sparc_get_pc_thunk.reg; \
.hidden __sparc_get_pc_thunk.reg; \
.type __sparc_get_pc_thunk.reg, #function; \
__sparc_get_pc_thunk.reg: \
jmp %o7 + 8; \
add %o7, %reg, %##reg; \
.previous; \
.endif;
/* The "-4" and "+4" offsets against _GLOBAL_OFFSET_TABLE_ are
critical since they represent the offset from the thunk call to the
instruction containing the _GLOBAL_OFFSET_TABLE_ reference.
Therefore these instructions cannot be moved around without
appropriate adjustments to those offsets.
Furthermore, these expressions are special in another regard. When
the assembler sees a reference to _GLOBAL_OFFSET_TABLE_ inside of
a %hi() or %lo(), it emits a PC-relative relocation. This causes
R_SPARC_HI22 to turn into R_SPARC_PC22, and R_SPARC_LO10 to turn into
R_SPARC_PC10, respectively.
Even when v9 we use a call sequence instead of using "rd %pc" because
RDPC is extremely expensive and incurs a full pipeline flush. */
#define SPARC_PIC_THUNK_CALL(reg) \
sethi %hi(_GLOBAL_OFFSET_TABLE_-4), %##reg; \
call __sparc_get_pc_thunk.reg; \
or %##reg, %lo(_GLOBAL_OFFSET_TABLE_+4), %##reg;
#define SETUP_PIC_REG(reg) \
SPARC_PIC_THUNK(reg) \
SPARC_PIC_THUNK_CALL(reg)
#define SETUP_PIC_REG_LEAF(reg, tmp) \
SPARC_PIC_THUNK(reg) \
mov %o7, %##tmp; \
SPARC_PIC_THUNK_CALL(reg); \
mov %##tmp, %o7;
#define LOADSYSCALL(x) mov __NR_##x, %g1
#define ENTRY(name) \
.align 4; \
.global C_SYMBOL_NAME(name); \
.type name, @function; \
C_LABEL(name) \
cfi_startproc;
#undef END
#define END(name) \
cfi_endproc; \
.size name, . - name
#define LOC(name) .L##name
#undef PSEUDO
#define PSEUDO(name, syscall_name, args) \
.text; \
ENTRY(name); \
LOADSYSCALL(syscall_name); \
ta 0x6d; \
bcc,pt %xcc, 1f; \
nop; \
SYSCALL_ERROR_HANDLER \
1:
#undef PSEUDO_NOERRNO
#define PSEUDO_NOERRNO(name, syscall_name, args)\
.text; \
ENTRY(name); \
LOADSYSCALL(syscall_name); \
ta 0x6d;
#undef PSEUDO_ERRVAL
#define PSEUDO_ERRVAL(name, syscall_name, args) \
.text; \
ENTRY(name); \
LOADSYSCALL(syscall_name); \
ta 0x6d;
#undef PSEUDO_END
#define PSEUDO_END(name) \
END(name)
#ifndef __PIC__
# define SYSCALL_ERROR_HANDLER \
mov %o7, %g1; \
call __syscall_error; \
mov %g1, %o7;
#else
# define SYSCALL_ERROR_HANDLER \
0: SETUP_PIC_REG_LEAF(o2,g1) \
sethi %gdop_hix22(errno), %g1;\
xor %g1, %gdop_lox10(errno), %g1;\
ldx [%o2 + %g1], %g1, %gdop(errno);\
st %o0, [%g1]; \
jmp %o7 + 8; \
mov -1, %o0;
#endif /* PIC */
#endif /* __ASSEMBLER__ */
/* This is the offset from the %sp to the backing store above the
register windows. So if you poke stack memory directly you add this. */
#define STACK_BIAS 2047
#endif
|
