linux32_locore.s revision 293514 
1/* $FreeBSD: stable/10/sys/amd64/linux32/linux32_locore.s 293514 2016-01-09 15:44:38Z dchagin $ */
2
3#include "linux32_assym.h"			/* system definitions */
4#include <machine/asmacros.h>			/* miscellaneous asm macros */
5
6#include <amd64/linux32/linux32_syscall.h>	/* system call numbers */
7
8.text
9.code32
10
11/*
12 * To avoid excess stack frame the signal trampoline code emulates
13 * the 'call' instruction.
14 */
15NON_GPROF_ENTRY(linux32_sigcode)
16	movl	%esp, %ebx			/* preserve sigframe */
17	call .getip0
18.getip0:
19	popl	%eax
20	add	$.startsigcode-.getip0, %eax	/* ret address */
21	push	%eax
22	jmp	*LINUX_SIGF_HANDLER(%ebx)
23.startsigcode:
24	popl	%eax
25	movl	$LINUX_SYS_linux_sigreturn,%eax	/* linux_sigreturn() */
26	int	$0x80				/* enter kernel with args */
27.endsigcode:
280:	jmp	0b
29
30NON_GPROF_ENTRY(linux32_rt_sigcode)
31	leal	LINUX_RT_SIGF_UC(%esp),%ebx	/* linux ucp */
32	leal	LINUX_RT_SIGF_SC(%ebx),%ecx	/* linux sigcontext */
33	movl	%esp, %edi
34	call	.getip1
35.getip1:
36	popl	%eax
37	add	$.startrtsigcode-.getip1, %eax	/* ret address */
38	push	%eax
39	jmp	*LINUX_RT_SIGF_HANDLER(%edi)
40.startrtsigcode:
41	movl	$LINUX_SYS_linux_rt_sigreturn,%eax   /* linux_rt_sigreturn() */
42	int	$0x80				/* enter kernel with args */
43.endrtsigcode:
440:	jmp	0b
45
46NON_GPROF_ENTRY(linux32_vsyscall)
47.startvsyscall:
48	int $0x80
49	ret
50.endvsyscall:
51
52
53	.section .note.Linux, "a",@note
54	.long 2f - 1f		/* namesz */
55	.balign 4
56	.long 4f - 3f		/* descsz */
57	.long 0
581:
59	.asciz "Linux"
602:
61	.balign 4
623:
63	.long LINUX_VERSION_CODE
644:
65	.balign 4
66	.previous
67
68
69#define do_cfa_expr(offset)                                             \
70	.byte 0x0f;			/* DW_CFA_def_cfa_expression */ \
71	.uleb128 11f-10f;		/*   length */                  \
7210:	.byte 0x74;			/*     DW_OP_breg4 */           \
73	.sleb128 offset;		/*      offset */               \
74	.byte 0x06;			/*     DW_OP_deref */           \
7511:
76
77
78	/* CIE */
79	.section .eh_frame,"a",@progbits
80.LSTARTFRAMEDLSI1:
81	.long .LENDCIEDLSI1-.LSTARTCIEDLSI1
82.LSTARTCIEDLSI1:
83	.long 0					/* CIE ID */
84	.byte 1					/* Version number */
85	.string "zRS"				/* NULL-terminated
86						 * augmentation string
87						 */
88	.uleb128 1				/* Code alignment factor */
89	.sleb128 -4				/* Data alignment factor */
90	.byte 8					/* Return address
91						 * register column
92						 */
93	.uleb128 1				/* Augmentation value length */
94	.byte 0x1b				/* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
95	.byte 0					/* DW_CFA_nop */
96	.align 4
97.LENDCIEDLSI1:
98
99	/* FDE */
100	.long .LENDFDEDLSI1-.LSTARTFDEDLSI1	/* Length FDE */
101.LSTARTFDEDLSI1:
102	.long .LSTARTFDEDLSI1-.LSTARTFRAMEDLSI1 /* CIE pointer */
103	.long .startsigcode-.			/* PC-relative start address */
104	.long .endsigcode-.startsigcode
105	.uleb128 0				/* Augmentation */
106	do_cfa_expr(LINUX_SIGF_SC-8)
107	.align 4
108.LENDFDEDLSI1:
109
110	.long .LENDFDEDLSI2-.LSTARTFDEDLSI2	/* Length FDE */
111.LSTARTFDEDLSI2:
112	.long .LSTARTFDEDLSI2-.LSTARTFRAMEDLSI1	/* CIE pointer */
113	.long .startrtsigcode-.			/* PC-relative start address */
114	.long .endrtsigcode-.startrtsigcode
115	.uleb128 0				/* Augmentation */
116	do_cfa_expr(LINUX_RT_SIGF_SC-4+LINUX_SC_ESP)
117	.align 4
118.LENDFDEDLSI2:
119	.previous
120
121	.section .eh_frame,"a",@progbits
122.LSTARTFRAMEDLSI2:
123	.long .LENDCIEDLSI2-.LSTARTCIEDLSI2
124.LSTARTCIEDLSI2:
125	.long 0					/* CIE ID */
126	.byte 1					/* Version number */
127	.string "zR"				/* NULL-terminated
128						 * augmentation string
129						 */
130	.uleb128 1				/* Code alignment factor */
131	.sleb128 -4				/* Data alignment factor */
132	.byte 8					/* Return address register column */
133	.uleb128 1				/* Augmentation value length */
134	.byte 0x1b				/* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
135	.byte 0x0c				/* DW_CFA_def_cfa */
136	.uleb128 4
137	.uleb128 4
138	.byte 0x88				/* DW_CFA_offset, column 0x8 */
139	.uleb128 1
140	.align 4
141.LENDCIEDLSI2:
142	.long .LENDFDEDLSI3-.LSTARTFDEDLSI3 /* Length FDE */
143.LSTARTFDEDLSI3:
144	.long .LSTARTFDEDLSI3-.LSTARTFRAMEDLSI2 /* CIE pointer */
145	.long .startvsyscall-.			/* PC-relative start address */
146	.long .endvsyscall-.startvsyscall
147	.uleb128 0
148	.align 4
149.LENDFDEDLSI3:
150	.previous
151