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authorRoland McGrath <roland@redhat.com>2008-01-30 07:30:44 -0500
committerIngo Molnar <mingo@elte.hu>2008-01-30 07:30:44 -0500
commit16f4bc738d616962a844e80f7b1fcb52c626542a (patch)
tree15e26944661e9597f9d7ec2579494a0651f6585a /arch/x86/ia32
parentaf65d64845a90c8f2fc90b97e2148ff74672e979 (diff)
x86 vDSO: ia32 vsyscall removal
This removes all the old vsyscall code from arch/x86/ia32/ that is no longer used because arch/x86/vdso/ code has replaced it. Signed-off-by: Roland McGrath <roland@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/ia32')
-rw-r--r--arch/x86/ia32/Makefile37
-rw-r--r--arch/x86/ia32/syscall32.c90
-rw-r--r--arch/x86/ia32/syscall32_syscall.S17
-rw-r--r--arch/x86/ia32/vsyscall-sigreturn.S142
-rw-r--r--arch/x86/ia32/vsyscall-syscall.S69
-rw-r--r--arch/x86/ia32/vsyscall-sysenter.S95
-rw-r--r--arch/x86/ia32/vsyscall.lds80
7 files changed, 0 insertions, 530 deletions
diff --git a/arch/x86/ia32/Makefile b/arch/x86/ia32/Makefile
index 1f58a21a41dc..8c19b763b2fb 100644
--- a/arch/x86/ia32/Makefile
+++ b/arch/x86/ia32/Makefile
@@ -12,40 +12,3 @@ obj-$(CONFIG_IA32_AOUT) += ia32_aout.o
12 12
13audit-class-$(CONFIG_AUDIT) := audit.o 13audit-class-$(CONFIG_AUDIT) := audit.o
14obj-$(CONFIG_IA32_EMULATION) += $(audit-class-y) 14obj-$(CONFIG_IA32_EMULATION) += $(audit-class-y)
15
16$(obj)/syscall32_syscall.o: \
17 $(foreach F,sysenter syscall,$(obj)/vsyscall-$F.so)
18
19# Teach kbuild about targets
20targets := $(foreach F,$(addprefix vsyscall-,sysenter syscall),\
21 $F.o $F.so $F.so.dbg)
22
23# The DSO images are built using a special linker script
24quiet_cmd_syscall = SYSCALL $@
25 cmd_syscall = $(CC) -m32 -nostdlib -shared \
26 $(call ld-option, -Wl$(comma)--hash-style=sysv) \
27 -Wl,-soname=linux-gate.so.1 -o $@ \
28 -Wl,-T,$(filter-out FORCE,$^)
29
30$(obj)/%.so: OBJCOPYFLAGS := -S
31$(obj)/%.so: $(obj)/%.so.dbg FORCE
32 $(call if_changed,objcopy)
33
34$(obj)/vsyscall-sysenter.so.dbg $(obj)/vsyscall-syscall.so.dbg: \
35$(obj)/vsyscall-%.so.dbg: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE
36 $(call if_changed,syscall)
37
38AFLAGS_vsyscall-sysenter.o = -m32 -Wa,-32
39AFLAGS_vsyscall-syscall.o = -m32 -Wa,-32
40
41vdsos := vdso32-sysenter.so vdso32-syscall.so
42
43quiet_cmd_vdso_install = INSTALL $@
44 cmd_vdso_install = cp $(@:vdso32-%.so=$(obj)/vsyscall-%.so.dbg) \
45 $(MODLIB)/vdso/$@
46
47$(vdsos):
48 @mkdir -p $(MODLIB)/vdso
49 $(call cmd,vdso_install)
50
51vdso_install: $(vdsos)
diff --git a/arch/x86/ia32/syscall32.c b/arch/x86/ia32/syscall32.c
deleted file mode 100644
index 98ff99f5b59a..000000000000
--- a/arch/x86/ia32/syscall32.c
+++ /dev/null
@@ -1,90 +0,0 @@
1/*
2 * Copyright 2002,2003 Andi Kleen, SuSE Labs
3 *
4 * vsyscall handling for 32bit processes. Map a stub page into it on
5 * demand because 32bit cannot reach the kernel's fixmaps
6 */
7#include <linux/mm.h>
8#include <linux/string.h>
9#include <linux/kernel.h>
10#include <linux/gfp.h>
11#include <linux/init.h>
12#include <linux/stringify.h>
13#include <linux/security.h>
14#include <asm/proto.h>
15#include <asm/tlbflush.h>
16#include <asm/ia32_unistd.h>
17#include <asm/vsyscall32.h>
18
19extern unsigned char syscall32_syscall[], syscall32_syscall_end[];
20extern unsigned char syscall32_sysenter[], syscall32_sysenter_end[];
21extern int sysctl_vsyscall32;
22
23static struct page *syscall32_pages[1];
24static int use_sysenter = -1;
25
26struct linux_binprm;
27
28/* Setup a VMA at program startup for the vsyscall page */
29int syscall32_setup_pages(struct linux_binprm *bprm, int exstack)
30{
31 struct mm_struct *mm = current->mm;
32 int ret;
33
34 down_write(&mm->mmap_sem);
35 /*
36 * MAYWRITE to allow gdb to COW and set breakpoints
37 *
38 * Make sure the vDSO gets into every core dump.
39 * Dumping its contents makes post-mortem fully interpretable later
40 * without matching up the same kernel and hardware config to see
41 * what PC values meant.
42 */
43 /* Could randomize here */
44 ret = install_special_mapping(mm, VSYSCALL32_BASE, PAGE_SIZE,
45 VM_READ|VM_EXEC|
46 VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
47 VM_ALWAYSDUMP,
48 syscall32_pages);
49 if (ret == 0) {
50 current->mm->context.vdso = (void __user *)VSYSCALL32_BASE;
51 current_thread_info()->sysenter_return = VSYSCALL32_SYSEXIT;
52 }
53 up_write(&mm->mmap_sem);
54 return ret;
55}
56
57static int __init init_syscall32(void)
58{
59 char *syscall32_page = (void *)get_zeroed_page(GFP_KERNEL);
60
61 if (!syscall32_page)
62 panic("Cannot allocate syscall32 page");
63 syscall32_pages[0] = virt_to_page(syscall32_page);
64 if (use_sysenter > 0) {
65 memcpy(syscall32_page, syscall32_sysenter,
66 syscall32_sysenter_end - syscall32_sysenter);
67 } else {
68 memcpy(syscall32_page, syscall32_syscall,
69 syscall32_syscall_end - syscall32_syscall);
70 }
71 return 0;
72}
73__initcall(init_syscall32);
74
75/* May not be __init: called during resume */
76void syscall32_cpu_init(void)
77{
78 if (use_sysenter < 0)
79 use_sysenter = (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL);
80
81 /*
82 * Load these always in case some future AMD CPU supports
83 * SYSENTER from compat mode too.
84 */
85 checking_wrmsrl(MSR_IA32_SYSENTER_CS, (u64)__KERNEL_CS);
86 checking_wrmsrl(MSR_IA32_SYSENTER_ESP, 0ULL);
87 checking_wrmsrl(MSR_IA32_SYSENTER_EIP, (u64)ia32_sysenter_target);
88
89 wrmsrl(MSR_CSTAR, ia32_cstar_target);
90}
diff --git a/arch/x86/ia32/syscall32_syscall.S b/arch/x86/ia32/syscall32_syscall.S
deleted file mode 100644
index 933f0f08b1cf..000000000000
--- a/arch/x86/ia32/syscall32_syscall.S
+++ /dev/null
@@ -1,17 +0,0 @@
1/* 32bit VDSOs mapped into user space. */
2
3 .section ".init.data","aw"
4
5 .globl syscall32_syscall
6 .globl syscall32_syscall_end
7
8syscall32_syscall:
9 .incbin "arch/x86/ia32/vsyscall-syscall.so"
10syscall32_syscall_end:
11
12 .globl syscall32_sysenter
13 .globl syscall32_sysenter_end
14
15syscall32_sysenter:
16 .incbin "arch/x86/ia32/vsyscall-sysenter.so"
17syscall32_sysenter_end:
diff --git a/arch/x86/ia32/vsyscall-sigreturn.S b/arch/x86/ia32/vsyscall-sigreturn.S
deleted file mode 100644
index 295eecf91f17..000000000000
--- a/arch/x86/ia32/vsyscall-sigreturn.S
+++ /dev/null
@@ -1,142 +0,0 @@
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 */
9
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
22
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
33
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:
53
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. */
75
76#define do_cfa_expr(offset) \
77 .byte 0x0f; /* DW_CFA_def_cfa_expression */ \
78 .uleb128 1f-0f; /* length */ \
790: .byte 0x74; /* DW_OP_breg4 */ \
80 .sleb128 offset; /* offset */ \
81 .byte 0x06; /* DW_OP_deref */ \
821:
83
84#define do_expr(regno, offset) \
85 .byte 0x10; /* DW_CFA_expression */ \
86 .uleb128 regno; /* regno */ \
87 .uleb128 1f-0f; /* length */ \
880: .byte 0x74; /* DW_OP_breg4 */ \
89 .sleb128 offset; /* offset */ \
901:
91
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)
101
102 .byte 0x42 /* DW_CFA_advance_loc 2 -- nop; popl eax. */
103
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)
113
114 .align 4
115.LENDFDE2:
116
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. */
128
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)
138
139 .align 4
140.LENDFDE3:
141
142#include "../vdso/vdso32/note.S"
diff --git a/arch/x86/ia32/vsyscall-syscall.S b/arch/x86/ia32/vsyscall-syscall.S
deleted file mode 100644
index cf9ef678de3e..000000000000
--- a/arch/x86/ia32/vsyscall-syscall.S
+++ /dev/null
@@ -1,69 +0,0 @@
1/*
2 * Code for the vsyscall page. This version uses the syscall instruction.
3 */
4
5#include <asm/ia32_unistd.h>
6#include <asm/asm-offsets.h>
7#include <asm/segment.h>
8
9 .code32
10 .text
11 .section .text.vsyscall,"ax"
12 .globl __kernel_vsyscall
13 .type __kernel_vsyscall,@function
14__kernel_vsyscall:
15.LSTART_vsyscall:
16 push %ebp
17.Lpush_ebp:
18 movl %ecx, %ebp
19 syscall
20 movl $__USER32_DS, %ecx
21 movl %ecx, %ss
22 movl %ebp, %ecx
23 popl %ebp
24.Lpop_ebp:
25 ret
26.LEND_vsyscall:
27 .size __kernel_vsyscall,.-.LSTART_vsyscall
28
29 .section .eh_frame,"a",@progbits
30.LSTARTFRAME:
31 .long .LENDCIE-.LSTARTCIE
32.LSTARTCIE:
33 .long 0 /* CIE ID */
34 .byte 1 /* Version number */
35 .string "zR" /* NUL-terminated augmentation string */
36 .uleb128 1 /* Code alignment factor */
37 .sleb128 -4 /* Data alignment factor */
38 .byte 8 /* Return address register column */
39 .uleb128 1 /* Augmentation value length */
40 .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
41 .byte 0x0c /* DW_CFA_def_cfa */
42 .uleb128 4
43 .uleb128 4
44 .byte 0x88 /* DW_CFA_offset, column 0x8 */
45 .uleb128 1
46 .align 4
47.LENDCIE:
48
49 .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */
50.LSTARTFDE1:
51 .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */
52 .long .LSTART_vsyscall-. /* PC-relative start address */
53 .long .LEND_vsyscall-.LSTART_vsyscall
54 .uleb128 0 /* Augmentation length */
55 /* What follows are the instructions for the table generation.
56 We have to record all changes of the stack pointer. */
57 .byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */
58 .byte 0x0e /* DW_CFA_def_cfa_offset */
59 .uleb128 8
60 .byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */
61 .byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */
62 .byte 0xc5 /* DW_CFA_restore %ebp */
63 .byte 0x0e /* DW_CFA_def_cfa_offset */
64 .uleb128 4
65 .align 4
66.LENDFDE1:
67
68#define SYSCALL_ENTER_KERNEL syscall
69#include "vsyscall-sigreturn.S"
diff --git a/arch/x86/ia32/vsyscall-sysenter.S b/arch/x86/ia32/vsyscall-sysenter.S
deleted file mode 100644
index ae056e553d13..000000000000
--- a/arch/x86/ia32/vsyscall-sysenter.S
+++ /dev/null
@@ -1,95 +0,0 @@
1/*
2 * Code for the vsyscall page. This version uses the sysenter instruction.
3 */
4
5#include <asm/ia32_unistd.h>
6#include <asm/asm-offsets.h>
7
8 .code32
9 .text
10 .section .text.vsyscall,"ax"
11 .globl __kernel_vsyscall
12 .type __kernel_vsyscall,@function
13__kernel_vsyscall:
14.LSTART_vsyscall:
15 push %ecx
16.Lpush_ecx:
17 push %edx
18.Lpush_edx:
19 push %ebp
20.Lenter_kernel:
21 movl %esp,%ebp
22 sysenter
23 .space 7,0x90
24 jmp .Lenter_kernel
25 /* 16: System call normal return point is here! */
26 pop %ebp
27.Lpop_ebp:
28 pop %edx
29.Lpop_edx:
30 pop %ecx
31.Lpop_ecx:
32 ret
33.LEND_vsyscall:
34 .size __kernel_vsyscall,.-.LSTART_vsyscall
35
36 .section .eh_frame,"a",@progbits
37.LSTARTFRAME:
38 .long .LENDCIE-.LSTARTCIE
39.LSTARTCIE:
40 .long 0 /* CIE ID */
41 .byte 1 /* Version number */
42 .string "zR" /* NUL-terminated augmentation string */
43 .uleb128 1 /* Code alignment factor */
44 .sleb128 -4 /* Data alignment factor */
45 .byte 8 /* Return address register column */
46 .uleb128 1 /* Augmentation value length */
47 .byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
48 .byte 0x0c /* DW_CFA_def_cfa */
49 .uleb128 4
50 .uleb128 4
51 .byte 0x88 /* DW_CFA_offset, column 0x8 */
52 .uleb128 1
53 .align 4
54.LENDCIE:
55
56 .long .LENDFDE1-.LSTARTFDE1 /* Length FDE */
57.LSTARTFDE1:
58 .long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */
59 .long .LSTART_vsyscall-. /* PC-relative start address */
60 .long .LEND_vsyscall-.LSTART_vsyscall
61 .uleb128 0 /* Augmentation length */
62 /* What follows are the instructions for the table generation.
63 We have to record all changes of the stack pointer. */
64 .byte 0x04 /* DW_CFA_advance_loc4 */
65 .long .Lpush_ecx-.LSTART_vsyscall
66 .byte 0x0e /* DW_CFA_def_cfa_offset */
67 .byte 0x08 /* RA at offset 8 now */
68 .byte 0x04 /* DW_CFA_advance_loc4 */
69 .long .Lpush_edx-.Lpush_ecx
70 .byte 0x0e /* DW_CFA_def_cfa_offset */
71 .byte 0x0c /* RA at offset 12 now */
72 .byte 0x04 /* DW_CFA_advance_loc4 */
73 .long .Lenter_kernel-.Lpush_edx
74 .byte 0x0e /* DW_CFA_def_cfa_offset */
75 .byte 0x10 /* RA at offset 16 now */
76 .byte 0x85, 0x04 /* DW_CFA_offset %ebp -16 */
77 /* Finally the epilogue. */
78 .byte 0x04 /* DW_CFA_advance_loc4 */
79 .long .Lpop_ebp-.Lenter_kernel
80 .byte 0x0e /* DW_CFA_def_cfa_offset */
81 .byte 0x12 /* RA at offset 12 now */
82 .byte 0xc5 /* DW_CFA_restore %ebp */
83 .byte 0x04 /* DW_CFA_advance_loc4 */
84 .long .Lpop_edx-.Lpop_ebp
85 .byte 0x0e /* DW_CFA_def_cfa_offset */
86 .byte 0x08 /* RA at offset 8 now */
87 .byte 0x04 /* DW_CFA_advance_loc4 */
88 .long .Lpop_ecx-.Lpop_edx
89 .byte 0x0e /* DW_CFA_def_cfa_offset */
90 .byte 0x04 /* RA at offset 4 now */
91 .align 4
92.LENDFDE1:
93
94#define SYSCALL_ENTER_KERNEL int $0x80
95#include "vsyscall-sigreturn.S"
diff --git a/arch/x86/ia32/vsyscall.lds b/arch/x86/ia32/vsyscall.lds
deleted file mode 100644
index 1dc86ff5bcb9..000000000000
--- a/arch/x86/ia32/vsyscall.lds
+++ /dev/null
@@ -1,80 +0,0 @@
1/*
2 * Linker script for vsyscall DSO. The vsyscall page is an ELF shared
3 * object prelinked to its virtual address. This script controls its layout.
4 */
5
6/* This must match <asm/fixmap.h>. */
7VSYSCALL_BASE = 0xffffe000;
8
9SECTIONS
10{
11 . = VSYSCALL_BASE + SIZEOF_HEADERS;
12
13 .hash : { *(.hash) } :text
14 .gnu.hash : { *(.gnu.hash) }
15 .dynsym : { *(.dynsym) }
16 .dynstr : { *(.dynstr) }
17 .gnu.version : { *(.gnu.version) }
18 .gnu.version_d : { *(.gnu.version_d) }
19 .gnu.version_r : { *(.gnu.version_r) }
20
21 /* This linker script is used both with -r and with -shared.
22 For the layouts to match, we need to skip more than enough
23 space for the dynamic symbol table et al. If this amount
24 is insufficient, ld -shared will barf. Just increase it here. */
25 . = VSYSCALL_BASE + 0x400;
26
27 .text.vsyscall : { *(.text.vsyscall) } :text =0x90909090
28
29 /* This is an 32bit object and we cannot easily get the offsets
30 into the 64bit kernel. Just hardcode them here. This assumes
31 that all the stubs don't need more than 0x100 bytes. */
32 . = VSYSCALL_BASE + 0x500;
33
34 .text.sigreturn : { *(.text.sigreturn) } :text =0x90909090
35
36 . = VSYSCALL_BASE + 0x600;
37
38 .text.rtsigreturn : { *(.text.rtsigreturn) } :text =0x90909090
39
40 .note : { *(.note.*) } :text :note
41 .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
42 .eh_frame : { KEEP (*(.eh_frame)) } :text
43 .dynamic : { *(.dynamic) } :text :dynamic
44 .useless : {
45 *(.got.plt) *(.got)
46 *(.data .data.* .gnu.linkonce.d.*)
47 *(.dynbss)
48 *(.bss .bss.* .gnu.linkonce.b.*)
49 } :text
50}
51
52/*
53 * We must supply the ELF program headers explicitly to get just one
54 * PT_LOAD segment, and set the flags explicitly to make segments read-only.
55 */
56PHDRS
57{
58 text PT_LOAD FILEHDR PHDRS FLAGS(5); /* PF_R|PF_X */
59 dynamic PT_DYNAMIC FLAGS(4); /* PF_R */
60 note PT_NOTE FLAGS(4); /* PF_R */
61 eh_frame_hdr 0x6474e550; /* PT_GNU_EH_FRAME, but ld doesn't match the name */
62}
63
64/*
65 * This controls what symbols we export from the DSO.
66 */
67VERSION
68{
69 LINUX_2.5 {
70 global:
71 __kernel_vsyscall;
72 __kernel_sigreturn;
73 __kernel_rt_sigreturn;
74
75 local: *;
76 };
77}
78
79/* The ELF entry point can be used to set the AT_SYSINFO value. */
80ENTRY(__kernel_vsyscall);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-25 11:19:48 -0500