ia64/xen-unstable

view linux-2.6-xen-sparse/arch/x86_64/ia32/vsyscall-sigreturn.S @ 13647:057c4c2991fa

32-on-64: Fix an one-off error in compat_addr_ok().
Signed-off-by: Jan Beulich <jbeulich@novell.com>
author kaf24@localhost.localdomain
date Fri Jan 26 13:36:52 2007 +0000 (2007-01-26)
parents 4fad820a2233
children
line source
1 /*
2 * Common code for the sigreturn entry points on the vsyscall page.
3 * This code uses SYSCALL_ENTER_KERNEL (either syscall or int $0x80)
4 * to enter the kernel.
5 * This file is #include'd by vsyscall-*.S to define them after the
6 * vsyscall entry point. The addresses we get for these entry points
7 * by doing ".balign 32" must match in both versions of the page.
8 */
10 .code32
11 .section .text.sigreturn,"ax"
12 .balign 32
13 .globl __kernel_sigreturn
14 .type __kernel_sigreturn,@function
15 __kernel_sigreturn:
16 .LSTART_sigreturn:
17 popl %eax
18 movl $__NR_ia32_sigreturn, %eax
19 SYSCALL_ENTER_KERNEL
20 .LEND_sigreturn:
21 .size __kernel_sigreturn,.-.LSTART_sigreturn
23 .section .text.rtsigreturn,"ax"
24 .balign 32
25 .globl __kernel_rt_sigreturn
26 .type __kernel_rt_sigreturn,@function
27 __kernel_rt_sigreturn:
28 .LSTART_rt_sigreturn:
29 movl $__NR_ia32_rt_sigreturn, %eax
30 SYSCALL_ENTER_KERNEL
31 .LEND_rt_sigreturn:
32 .size __kernel_rt_sigreturn,.-.LSTART_rt_sigreturn
34 .section .eh_frame,"a",@progbits
35 .LSTARTFRAMES:
36 .long .LENDCIES-.LSTARTCIES
37 .LSTARTCIES:
38 .long 0 /* CIE ID */
39 .byte 1 /* Version number */
40 .string "zRS" /* NUL-terminated augmentation string */
41 .uleb128 1 /* Code alignment factor */
42 .sleb128 -4 /* Data alignment factor */
43 .byte 8 /* Return address register column */
44 .uleb128 1 /* Augmentation value length */
45 .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
46 .byte 0x0c /* DW_CFA_def_cfa */
47 .uleb128 4
48 .uleb128 4
49 .byte 0x88 /* DW_CFA_offset, column 0x8 */
50 .uleb128 1
51 .align 4
52 .LENDCIES:
54 .long .LENDFDE2-.LSTARTFDE2 /* Length FDE */
55 .LSTARTFDE2:
56 .long .LSTARTFDE2-.LSTARTFRAMES /* CIE pointer */
57 /* HACK: The dwarf2 unwind routines will subtract 1 from the
58 return address to get an address in the middle of the
59 presumed call instruction. Since we didn't get here via
60 a call, we need to include the nop before the real start
61 to make up for it. */
62 .long .LSTART_sigreturn-1-. /* PC-relative start address */
63 .long .LEND_sigreturn-.LSTART_sigreturn+1
64 .uleb128 0 /* Augmentation length */
65 /* What follows are the instructions for the table generation.
66 We record the locations of each register saved. This is
67 complicated by the fact that the "CFA" is always assumed to
68 be the value of the stack pointer in the caller. This means
69 that we must define the CFA of this body of code to be the
70 saved value of the stack pointer in the sigcontext. Which
71 also means that there is no fixed relation to the other
72 saved registers, which means that we must use DW_CFA_expression
73 to compute their addresses. It also means that when we
74 adjust the stack with the popl, we have to do it all over again. */
76 #define do_cfa_expr(offset) \
77 .byte 0x0f; /* DW_CFA_def_cfa_expression */ \
78 .uleb128 1f-0f; /* length */ \
79 0: .byte 0x74; /* DW_OP_breg4 */ \
80 .sleb128 offset; /* offset */ \
81 .byte 0x06; /* DW_OP_deref */ \
82 1:
84 #define do_expr(regno, offset) \
85 .byte 0x10; /* DW_CFA_expression */ \
86 .uleb128 regno; /* regno */ \
87 .uleb128 1f-0f; /* length */ \
88 0: .byte 0x74; /* DW_OP_breg4 */ \
89 .sleb128 offset; /* offset */ \
90 1:
92 do_cfa_expr(IA32_SIGCONTEXT_esp+4)
93 do_expr(0, IA32_SIGCONTEXT_eax+4)
94 do_expr(1, IA32_SIGCONTEXT_ecx+4)
95 do_expr(2, IA32_SIGCONTEXT_edx+4)
96 do_expr(3, IA32_SIGCONTEXT_ebx+4)
97 do_expr(5, IA32_SIGCONTEXT_ebp+4)
98 do_expr(6, IA32_SIGCONTEXT_esi+4)
99 do_expr(7, IA32_SIGCONTEXT_edi+4)
100 do_expr(8, IA32_SIGCONTEXT_eip+4)
102 .byte 0x42 /* DW_CFA_advance_loc 2 -- nop; popl eax. */
104 do_cfa_expr(IA32_SIGCONTEXT_esp)
105 do_expr(0, IA32_SIGCONTEXT_eax)
106 do_expr(1, IA32_SIGCONTEXT_ecx)
107 do_expr(2, IA32_SIGCONTEXT_edx)
108 do_expr(3, IA32_SIGCONTEXT_ebx)
109 do_expr(5, IA32_SIGCONTEXT_ebp)
110 do_expr(6, IA32_SIGCONTEXT_esi)
111 do_expr(7, IA32_SIGCONTEXT_edi)
112 do_expr(8, IA32_SIGCONTEXT_eip)
114 .align 4
115 .LENDFDE2:
117 .long .LENDFDE3-.LSTARTFDE3 /* Length FDE */
118 .LSTARTFDE3:
119 .long .LSTARTFDE3-.LSTARTFRAMES /* CIE pointer */
120 /* HACK: See above wrt unwind library assumptions. */
121 .long .LSTART_rt_sigreturn-1-. /* PC-relative start address */
122 .long .LEND_rt_sigreturn-.LSTART_rt_sigreturn+1
123 .uleb128 0 /* Augmentation */
124 /* What follows are the instructions for the table generation.
125 We record the locations of each register saved. This is
126 slightly less complicated than the above, since we don't
127 modify the stack pointer in the process. */
129 do_cfa_expr(IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_esp)
130 do_expr(0, IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_eax)
131 do_expr(1, IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_ecx)
132 do_expr(2, IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_edx)
133 do_expr(3, IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_ebx)
134 do_expr(5, IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_ebp)
135 do_expr(6, IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_esi)
136 do_expr(7, IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_edi)
137 do_expr(8, IA32_RT_SIGFRAME_sigcontext-4 + IA32_SIGCONTEXT_eip)
139 .align 4
140 .LENDFDE3:
142 #include <vsyscall-note.S>