1/* $FreeBSD: stable/10/sys/i386/linux/linux_locore.s 187948 2009-01-31 11:37:21Z obrien $ */
| 1/* $FreeBSD: stable/10/sys/i386/linux/linux_locore.s 293514 2016-01-09 15:44:38Z dchagin $ */
|
2
3#include "linux_assym.h" /* system definitions */
4#include <machine/asmacros.h> /* miscellaneous asm macros */
5
6#include <i386/linux/linux_syscall.h> /* system call numbers */
7
| 2
3#include "linux_assym.h" /* system definitions */
4#include <machine/asmacros.h> /* miscellaneous asm macros */
5
6#include <i386/linux/linux_syscall.h> /* system call numbers */
7
|
| 8#include "assym.s"
9
10/*
11 * To avoid excess stack frame the signal trampoline code emulates
12 * the 'call' instruction.
13 */
|
8NON_GPROF_ENTRY(linux_sigcode)
| 14NON_GPROF_ENTRY(linux_sigcode)
|
9 call *LINUX_SIGF_HANDLER(%esp)
10 leal LINUX_SIGF_SC(%esp),%ebx /* linux scp */
11 mov LINUX_SC_GS(%ebx),%gs
12 movl %esp, %ebx /* pass sigframe */
13 push %eax /* fake ret addr */
| 15 movl %esp, %ebx /* preserve sigframe */
16 call .getip0
17.getip0:
18 popl %eax
19 add $.startsigcode-.getip0, %eax /* ret address */
20 push %eax
21 jmp *LINUX_SIGF_HANDLER(%ebx)
22.startsigcode:
23 popl %eax /* gcc unwind code need this */
|
14 movl $LINUX_SYS_linux_sigreturn,%eax /* linux_sigreturn() */
15 int $0x80 /* enter kernel with args */
| 24 movl $LINUX_SYS_linux_sigreturn,%eax /* linux_sigreturn() */
25 int $0x80 /* enter kernel with args */
|
| 26.endsigcode:
|
160: jmp 0b
| 270: jmp 0b
|
17 ALIGN_TEXT
18/* XXXXX */
19linux_rt_sigcode:
20 call *LINUX_RT_SIGF_HANDLER(%esp)
| 28
29NON_GPROF_ENTRY(linux_rt_sigcode)
|
21 leal LINUX_RT_SIGF_UC(%esp),%ebx /* linux ucp */
22 leal LINUX_RT_SIGF_SC(%ebx),%ecx /* linux sigcontext */
| 30 leal LINUX_RT_SIGF_UC(%esp),%ebx /* linux ucp */
31 leal LINUX_RT_SIGF_SC(%ebx),%ecx /* linux sigcontext */
|
23 mov LINUX_SC_GS(%ecx),%gs
24 push %eax /* fake ret addr */
| 32 movl %esp, %edi
33 call .getip1
34.getip1:
35 popl %eax
36 add $.startrtsigcode-.getip1, %eax /* ret address */
37 push %eax
38 jmp *LINUX_RT_SIGF_HANDLER(%edi)
39.startrtsigcode:
|
25 movl $LINUX_SYS_linux_rt_sigreturn,%eax /* linux_rt_sigreturn() */
26 int $0x80 /* enter kernel with args */
| 40 movl $LINUX_SYS_linux_rt_sigreturn,%eax /* linux_rt_sigreturn() */
41 int $0x80 /* enter kernel with args */
|
| 42.endrtsigcode:
|
270: jmp 0b
| 430: jmp 0b
|
28 ALIGN_TEXT
29/* XXXXX */
30linux_esigcode:
| |
31
| 44
|
32 .data
33 .globl linux_szsigcode, linux_sznonrtsigcode
34linux_szsigcode:
35 .long linux_esigcode-linux_sigcode
36linux_sznonrtsigcode:
37 .long linux_rt_sigcode-linux_sigcode
| 45NON_GPROF_ENTRY(linux_vsyscall)
46.startvsyscall:
47 int $0x80
48 ret
49.endvsyscall:
50
51
52 .section .note.Linux, "a",@note
53 .long 2f - 1f /* namesz */
54 .balign 4
55 .long 4f - 3f /* descsz */
56 .long 0
571:
58 .asciz "Linux"
592:
60 .balign 4
613:
62 .long LINUX_VERSION_CODE
634:
64 .balign 4
65 .previous
66
67
68#define do_cfa_expr(offset) \
69 .byte 0x0f; /* DW_CFA_def_cfa_expression */ \
70 .uleb128 11f-10f; /* length */ \
7110: .byte 0x74; /* DW_OP_breg4 */ \
72 .sleb128 offset; /* offset */ \
73 .byte 0x06; /* DW_OP_deref */ \
7411:
75
76
77 /* CIE */
78 .section .eh_frame,"a",@progbits
79.LSTARTFRAMEDLSI1:
80 .long .LENDCIEDLSI1-.LSTARTCIEDLSI1
81.LSTARTCIEDLSI1:
82 .long 0 /* CIE ID */
83 .byte 1 /* Version number */
84 .string "zRS" /* NULL-terminated
85 * augmentation string
86 */
87 .uleb128 1 /* Code alignment factor */
88 .sleb128 -4 /* Data alignment factor */
89 .byte 8 /* Return address
90 * register column
91 */
92 .uleb128 1 /* Augmentation value length */
93 .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
94 .byte 0 /* DW_CFA_nop */
95 .align 4
96.LENDCIEDLSI1:
97
98 /* FDE */
99 .long .LENDFDEDLSI1-.LSTARTFDEDLSI1 /* Length FDE */
100.LSTARTFDEDLSI1:
101 .long .LSTARTFDEDLSI1-.LSTARTFRAMEDLSI1 /* CIE pointer */
102 .long .startsigcode-. /* PC-relative start address */
103 .long .endsigcode-.startsigcode
104 .uleb128 0 /* Augmentation */
105 do_cfa_expr(LINUX_SIGF_SC-8)
106 .align 4
107.LENDFDEDLSI1:
108
109 .long .LENDFDEDLSI2-.LSTARTFDEDLSI2 /* Length FDE */
110.LSTARTFDEDLSI2:
111 .long .LSTARTFDEDLSI2-.LSTARTFRAMEDLSI1 /* CIE pointer */
112 .long .startrtsigcode-. /* PC-relative start address */
113 .long .endrtsigcode-.startrtsigcode
114 .uleb128 0 /* Augmentation */
115 do_cfa_expr(LINUX_RT_SIGF_SC-4+LINUX_SC_ESP)
116 .align 4
117.LENDFDEDLSI2:
118 .previous
119
120 .section .eh_frame,"a",@progbits
121.LSTARTFRAMEDLSI2:
122 .long .LENDCIEDLSI2-.LSTARTCIEDLSI2
123.LSTARTCIEDLSI2:
124 .long 0 /* CIE ID */
125 .byte 1 /* Version number */
126 .string "zR" /* NULL-terminated
127 * augmentation string
128 */
129 .uleb128 1 /* Code alignment factor */
130 .sleb128 -4 /* Data alignment factor */
131 .byte 8 /* Return address register column */
132 .uleb128 1 /* Augmentation value length */
133 .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
134 .byte 0x0c /* DW_CFA_def_cfa */
135 .uleb128 4
136 .uleb128 4
137 .byte 0x88 /* DW_CFA_offset, column 0x8 */
138 .uleb128 1
139 .align 4
140.LENDCIEDLSI2:
141 .long .LENDFDEDLSI3-.LSTARTFDEDLSI3 /* Length FDE */
142.LSTARTFDEDLSI3:
143 .long .LSTARTFDEDLSI3-.LSTARTFRAMEDLSI2 /* CIE pointer */
144 .long .startvsyscall-. /* PC-relative start address */
145 .long .endvsyscall-.startvsyscall
146 .uleb128 0
147 .align 4
148.LENDFDEDLSI3:
149 .previous
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