mirror of
https://github.com/torvalds/linux.git
synced 2024-12-10 05:01:26 +00:00
x86 vDSO: ia32 vdso32-syscall build
This puts the syscall version of the 32-bit vDSO in arch/x86/vdso/vdso32/ for 64-bit IA32 support. This is not used yet, but it paves the way for consolidating the 32-bit vDSO source and build logic all in one place. 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>
This commit is contained in:
parent
36197c92a2
commit
00f8b1bc0e
@ -71,6 +71,7 @@ $(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE
|
||||
#
|
||||
obj-$(VDSO32-y) += vdso32-syms.lds
|
||||
vdso32.so-$(CONFIG_X86_32) += int80
|
||||
vdso32.so-$(CONFIG_COMPAT) += syscall
|
||||
vdso32.so-$(VDSO32-y) += sysenter
|
||||
|
||||
CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
|
||||
|
@ -6,9 +6,12 @@
|
||||
* routines are constant for all vsyscall implementations.
|
||||
*/
|
||||
|
||||
#include <asm/unistd.h>
|
||||
#include <asm/unistd_32.h>
|
||||
#include <asm/asm-offsets.h>
|
||||
|
||||
#ifndef SYSCALL_ENTER_KERNEL
|
||||
#define SYSCALL_ENTER_KERNEL int $0x80
|
||||
#endif
|
||||
|
||||
/* XXX
|
||||
Should these be named "_sigtramp" or something?
|
||||
@ -22,7 +25,7 @@ __kernel_sigreturn:
|
||||
.LSTART_sigreturn:
|
||||
popl %eax /* XXX does this mean it needs unwind info? */
|
||||
movl $__NR_sigreturn, %eax
|
||||
int $0x80
|
||||
SYSCALL_ENTER_KERNEL
|
||||
.LEND_sigreturn:
|
||||
.size __kernel_sigreturn,.-.LSTART_sigreturn
|
||||
|
||||
@ -32,7 +35,7 @@ __kernel_sigreturn:
|
||||
__kernel_rt_sigreturn:
|
||||
.LSTART_rt_sigreturn:
|
||||
movl $__NR_rt_sigreturn, %eax
|
||||
int $0x80
|
||||
SYSCALL_ENTER_KERNEL
|
||||
.LEND_rt_sigreturn:
|
||||
.size __kernel_rt_sigreturn,.-.LSTART_rt_sigreturn
|
||||
.balign 32
|
||||
|
69
arch/x86/vdso/vdso32/syscall.S
Normal file
69
arch/x86/vdso/vdso32/syscall.S
Normal file
@ -0,0 +1,69 @@
|
||||
/*
|
||||
* Code for the vsyscall page. This version uses the syscall instruction.
|
||||
*/
|
||||
|
||||
#include <asm/asm-offsets.h>
|
||||
#include <asm/segment.h>
|
||||
|
||||
.text
|
||||
.globl __kernel_vsyscall
|
||||
.type __kernel_vsyscall,@function
|
||||
__kernel_vsyscall:
|
||||
.LSTART_vsyscall:
|
||||
push %ebp
|
||||
.Lpush_ebp:
|
||||
movl %ecx, %ebp
|
||||
syscall
|
||||
movl $__USER32_DS, %ecx
|
||||
movl %ecx, %ss
|
||||
movl %ebp, %ecx
|
||||
popl %ebp
|
||||
.Lpop_ebp:
|
||||
ret
|
||||
.LEND_vsyscall:
|
||||
.size __kernel_vsyscall,.-.LSTART_vsyscall
|
||||
|
||||
.section .eh_frame,"a",@progbits
|
||||
.LSTARTFRAME:
|
||||
.long .LENDCIE-.LSTARTCIE
|
||||
.LSTARTCIE:
|
||||
.long 0 /* CIE ID */
|
||||
.byte 1 /* Version number */
|
||||
.string "zR" /* NUL-terminated augmentation string */
|
||||
.uleb128 1 /* Code alignment factor */
|
||||
.sleb128 -4 /* Data alignment factor */
|
||||
.byte 8 /* Return address register column */
|
||||
.uleb128 1 /* Augmentation value length */
|
||||
.byte 0x1b /* DW_EH_PE_pcrel|DW_EH_PE_sdata4. */
|
||||
.byte 0x0c /* DW_CFA_def_cfa */
|
||||
.uleb128 4
|
||||
.uleb128 4
|
||||
.byte 0x88 /* DW_CFA_offset, column 0x8 */
|
||||
.uleb128 1
|
||||
.align 4
|
||||
.LENDCIE:
|
||||
|
||||
.long .LENDFDE1-.LSTARTFDE1 /* Length FDE */
|
||||
.LSTARTFDE1:
|
||||
.long .LSTARTFDE1-.LSTARTFRAME /* CIE pointer */
|
||||
.long .LSTART_vsyscall-. /* PC-relative start address */
|
||||
.long .LEND_vsyscall-.LSTART_vsyscall
|
||||
.uleb128 0 /* Augmentation length */
|
||||
/* What follows are the instructions for the table generation.
|
||||
We have to record all changes of the stack pointer. */
|
||||
.byte 0x40 + .Lpush_ebp-.LSTART_vsyscall /* DW_CFA_advance_loc */
|
||||
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
||||
.uleb128 8
|
||||
.byte 0x85, 0x02 /* DW_CFA_offset %ebp -8 */
|
||||
.byte 0x40 + .Lpop_ebp-.Lpush_ebp /* DW_CFA_advance_loc */
|
||||
.byte 0xc5 /* DW_CFA_restore %ebp */
|
||||
.byte 0x0e /* DW_CFA_def_cfa_offset */
|
||||
.uleb128 4
|
||||
.align 4
|
||||
.LENDFDE1:
|
||||
|
||||
/*
|
||||
* Get the common code for the sigreturn entry points.
|
||||
*/
|
||||
#define SYSCALL_ENTER_KERNEL syscall
|
||||
#include "sigreturn.S"
|
Loading…
Reference in New Issue
Block a user