1 /* $FreeBSD$ */
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 */
14 NON_GPROF_ENTRY(linux_sigcode)
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 */
24 movl $LINUX_SYS_linux_sigreturn,%eax /* linux_sigreturn() */
25 int $0x80 /* enter kernel with args */
26 .endsigcode:
27 0: jmp 0b
28
29 NON_GPROF_ENTRY(linux_rt_sigcode)
30 leal LINUX_RT_SIGF_UC(%esp),%ebx /* linux ucp */
31 leal LINUX_RT_SIGF_SC(%ebx),%ecx /* linux sigcontext */
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:
40 movl $LINUX_SYS_linux_rt_sigreturn,%eax /* linux_rt_sigreturn() */
41 int $0x80 /* enter kernel with args */
42 .endrtsigcode:
43 0: jmp 0b
44
45 NON_GPROF_ENTRY(linux_vsyscall)
46 .startvsyscall:
47 int $0x80
48 ret
49 .endvsyscall:
50
51 #if 0
52 .section .note.Linux, "a",@note
53 .long 2f - 1f /* namesz */
54 .balign 4
55 .long 4f - 3f /* descsz */
56 .long 0
57 1:
58 .asciz "Linux"
59 2:
60 .balign 4
61 3:
62 .long LINUX_VERSION_CODE
63 4:
64 .balign 4
65 .previous
66 #endif
67
68 #define do_cfa_expr(offset) \
69 .byte 0x0f; /* DW_CFA_def_cfa_expression */ \
70 .uleb128 11f-10f; /* length */ \
71 10: .byte 0x74; /* DW_OP_breg4 */ \
72 .sleb128 offset; /* offset */ \
73 .byte 0x06; /* DW_OP_deref */ \
74 11:
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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