x86/asm/entry/32: Improve code readability
Make the 64-bit compat 32-bit syscall entry code a bit more readable: - eliminate whitespace noise - use consistent vertical spacing - use consistent assembly coding style similar to entry_64.S - fix various comments No code changed: arch/x86/entry/ia32entry.o: text data bss dec hex filename 1391 0 0 1391 56f ia32entry.o.before 1391 0 0 1391 56f ia32entry.o.after md5: f28501dcc366e68b557313942c6496d6 ia32entry.o.before.asm f28501dcc366e68b557313942c6496d6 ia32entry.o.after.asm Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar
parent
53e9accf0f
commit
54ad726c51
@ -1,15 +1,14 @@
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/*
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* Compatibility mode system call entry point for x86-64.
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*
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* Compatibility mode system call entry point for x86-64.
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*
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* Copyright 2000-2002 Andi Kleen, SuSE Labs.
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*/
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*/
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#include "calling.h"
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#include <asm/asm-offsets.h>
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#include <asm/current.h>
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#include <asm/errno.h>
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#include <asm/ia32_unistd.h>
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#include <asm/thread_info.h>
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#include <asm/ia32_unistd.h>
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#include <asm/thread_info.h>
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#include <asm/segment.h>
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#include <asm/irqflags.h>
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#include <asm/asm.h>
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@ -20,11 +19,11 @@
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/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
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#include <linux/elf-em.h>
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#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
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#define __AUDIT_ARCH_LE 0x40000000
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#define __AUDIT_ARCH_LE 0x40000000
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#ifndef CONFIG_AUDITSYSCALL
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#define sysexit_audit ia32_ret_from_sys_call
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#define sysretl_audit ia32_ret_from_sys_call
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# define sysexit_audit ia32_ret_from_sys_call
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# define sysretl_audit ia32_ret_from_sys_call
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#endif
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.section .entry.text, "ax"
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@ -37,7 +36,7 @@ ENDPROC(native_usergs_sysret32)
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#endif
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/*
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* 32bit SYSENTER instruction entry.
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* 32-bit SYSENTER instruction entry.
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*
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* SYSENTER loads ss, rsp, cs, and rip from previously programmed MSRs.
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* IF and VM in rflags are cleared (IOW: interrupts are off).
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@ -79,7 +78,7 @@ ENTRY(ia32_sysenter_target)
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pushq %rbp /* pt_regs->sp */
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pushfq /* pt_regs->flags */
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pushq $__USER32_CS /* pt_regs->cs */
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pushq %r10 /* pt_regs->ip = thread_info->sysenter_return */
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pushq %r10 /* pt_regs->ip = thread_info->sysenter_return */
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pushq %rax /* pt_regs->orig_ax */
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pushq %rdi /* pt_regs->di */
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pushq %rsi /* pt_regs->si */
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@ -87,15 +86,15 @@ ENTRY(ia32_sysenter_target)
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pushq %rcx /* pt_regs->cx */
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pushq $-ENOSYS /* pt_regs->ax */
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cld
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sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */
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sub $(10*8), %rsp /* pt_regs->r8-11, bp, bx, r12-15 not saved */
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/*
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* no need to do an access_ok check here because rbp has been
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* 32bit zero extended
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* 32-bit zero extended
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*/
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ASM_STAC
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1: movl (%rbp),%ebp
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_ASM_EXTABLE(1b,ia32_badarg)
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1: movl (%rbp), %ebp
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_ASM_EXTABLE(1b, ia32_badarg)
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ASM_CLAC
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/*
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@ -103,26 +102,26 @@ ENTRY(ia32_sysenter_target)
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* ourselves. To save a few cycles, we can check whether
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* NT was set instead of doing an unconditional popfq.
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*/
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testl $X86_EFLAGS_NT,EFLAGS(%rsp)
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jnz sysenter_fix_flags
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testl $X86_EFLAGS_NT, EFLAGS(%rsp)
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jnz sysenter_fix_flags
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sysenter_flags_fixed:
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orl $TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
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testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
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jnz sysenter_tracesys
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jnz sysenter_tracesys
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sysenter_do_call:
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/* 32bit syscall -> 64bit C ABI argument conversion */
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movl %edi,%r8d /* arg5 */
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movl %ebp,%r9d /* arg6 */
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xchg %ecx,%esi /* rsi:arg2, rcx:arg4 */
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movl %ebx,%edi /* arg1 */
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movl %edx,%edx /* arg3 (zero extension) */
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/* 32-bit syscall -> 64-bit C ABI argument conversion */
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movl %edi, %r8d /* arg5 */
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movl %ebp, %r9d /* arg6 */
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xchg %ecx, %esi /* rsi:arg2, rcx:arg4 */
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movl %ebx, %edi /* arg1 */
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movl %edx, %edx /* arg3 (zero extension) */
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sysenter_dispatch:
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cmpq $(IA32_NR_syscalls-1),%rax
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cmpq $(IA32_NR_syscalls-1), %rax
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ja 1f
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call *ia32_sys_call_table(,%rax,8)
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movq %rax,RAX(%rsp)
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call *ia32_sys_call_table(, %rax, 8)
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movq %rax, RAX(%rsp)
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1:
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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@ -139,21 +138,21 @@ sysexit_from_sys_call:
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* This code path is still called 'sysexit' because it pairs
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* with 'sysenter' and it uses the SYSENTER calling convention.
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*/
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andl $~TS_COMPAT,ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
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movl RIP(%rsp),%ecx /* User %eip */
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andl $~TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
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movl RIP(%rsp), %ecx /* User %eip */
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RESTORE_RSI_RDI
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xorl %edx,%edx /* avoid info leaks */
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xorq %r8,%r8
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xorq %r9,%r9
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xorq %r10,%r10
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movl EFLAGS(%rsp),%r11d /* User eflags */
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xorl %edx, %edx /* Do not leak kernel information */
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xorq %r8, %r8
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xorq %r9, %r9
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xorq %r10, %r10
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movl EFLAGS(%rsp), %r11d /* User eflags */
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TRACE_IRQS_ON
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/*
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* SYSRETL works even on Intel CPUs. Use it in preference to SYSEXIT,
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* since it avoids a dicey window with interrupts enabled.
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*/
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movl RSP(%rsp),%esp
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movl RSP(%rsp), %esp
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/*
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* USERGS_SYSRET32 does:
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@ -179,51 +178,51 @@ sysexit_from_sys_call:
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#ifdef CONFIG_AUDITSYSCALL
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.macro auditsys_entry_common
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movl %esi,%r8d /* 5th arg: 4th syscall arg */
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movl %ecx,%r9d /*swap with edx*/
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movl %edx,%ecx /* 4th arg: 3rd syscall arg */
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movl %r9d,%edx /* 3rd arg: 2nd syscall arg */
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movl %ebx,%esi /* 2nd arg: 1st syscall arg */
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movl %eax,%edi /* 1st arg: syscall number */
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call __audit_syscall_entry
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movl ORIG_RAX(%rsp),%eax /* reload syscall number */
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movl %ebx,%edi /* reload 1st syscall arg */
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movl RCX(%rsp),%esi /* reload 2nd syscall arg */
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movl RDX(%rsp),%edx /* reload 3rd syscall arg */
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movl RSI(%rsp),%ecx /* reload 4th syscall arg */
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movl RDI(%rsp),%r8d /* reload 5th syscall arg */
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movl %esi, %r8d /* 5th arg: 4th syscall arg */
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movl %ecx, %r9d /* swap with edx */
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movl %edx, %ecx /* 4th arg: 3rd syscall arg */
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movl %r9d, %edx /* 3rd arg: 2nd syscall arg */
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movl %ebx, %esi /* 2nd arg: 1st syscall arg */
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movl %eax, %edi /* 1st arg: syscall number */
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call __audit_syscall_entry
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movl ORIG_RAX(%rsp), %eax /* reload syscall number */
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movl %ebx, %edi /* reload 1st syscall arg */
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movl RCX(%rsp), %esi /* reload 2nd syscall arg */
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movl RDX(%rsp), %edx /* reload 3rd syscall arg */
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movl RSI(%rsp), %ecx /* reload 4th syscall arg */
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movl RDI(%rsp), %r8d /* reload 5th syscall arg */
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.endm
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.macro auditsys_exit exit
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testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
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jnz ia32_ret_from_sys_call
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testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
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jnz ia32_ret_from_sys_call
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TRACE_IRQS_ON
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ENABLE_INTERRUPTS(CLBR_NONE)
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movl %eax,%esi /* second arg, syscall return value */
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cmpl $-MAX_ERRNO,%eax /* is it an error ? */
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jbe 1f
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movslq %eax, %rsi /* if error sign extend to 64 bits */
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1: setbe %al /* 1 if error, 0 if not */
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movzbl %al,%edi /* zero-extend that into %edi */
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call __audit_syscall_exit
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movq RAX(%rsp),%rax /* reload syscall return value */
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movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
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movl %eax, %esi /* second arg, syscall return value */
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cmpl $-MAX_ERRNO, %eax /* is it an error ? */
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jbe 1f
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movslq %eax, %rsi /* if error sign extend to 64 bits */
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1: setbe %al /* 1 if error, 0 if not */
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movzbl %al, %edi /* zero-extend that into %edi */
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call __audit_syscall_exit
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movq RAX(%rsp), %rax /* reload syscall return value */
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movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %edi
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl %edi, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
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jz \exit
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xorl %eax, %eax /* do not leak kernel information */
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testl %edi, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
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jz \exit
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xorl %eax, %eax /* Do not leak kernel information */
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movq %rax, R11(%rsp)
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movq %rax, R10(%rsp)
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movq %rax, R9(%rsp)
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movq %rax, R8(%rsp)
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jmp int_with_check
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jmp int_with_check
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.endm
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sysenter_auditsys:
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auditsys_entry_common
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movl %ebp,%r9d /* reload 6th syscall arg */
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jmp sysenter_dispatch
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movl %ebp, %r9d /* reload 6th syscall arg */
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jmp sysenter_dispatch
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sysexit_audit:
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auditsys_exit sysexit_from_sys_call
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@ -232,7 +231,7 @@ sysexit_audit:
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sysenter_fix_flags:
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pushq $(X86_EFLAGS_IF|X86_EFLAGS_FIXED)
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popfq
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jmp sysenter_flags_fixed
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jmp sysenter_flags_fixed
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sysenter_tracesys:
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#ifdef CONFIG_AUDITSYSCALL
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@ -240,12 +239,12 @@ sysenter_tracesys:
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jz sysenter_auditsys
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#endif
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SAVE_EXTRA_REGS
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xorl %eax, %eax /* do not leak kernel information */
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xorl %eax, %eax /* Do not leak kernel information */
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movq %rax, R11(%rsp)
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movq %rax, R10(%rsp)
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movq %rax, R9(%rsp)
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movq %rax, R8(%rsp)
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movq %rsp,%rdi /* &pt_regs -> arg1 */
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movq %rsp, %rdi /* &pt_regs -> arg1 */
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call syscall_trace_enter
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/* Reload arg registers from stack. (see sysenter_tracesys) */
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@ -253,23 +252,23 @@ sysenter_tracesys:
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movl RDX(%rsp), %edx
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movl RSI(%rsp), %esi
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movl RDI(%rsp), %edi
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movl %eax, %eax /* zero extension */
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movl %eax, %eax /* zero extension */
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RESTORE_EXTRA_REGS
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jmp sysenter_do_call
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ENDPROC(ia32_sysenter_target)
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/*
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* 32bit SYSCALL instruction entry.
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* 32-bit SYSCALL instruction entry.
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*
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* 32bit SYSCALL saves rip to rcx, clears rflags.RF, then saves rflags to r11,
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* 32-bit SYSCALL saves rip to rcx, clears rflags.RF, then saves rflags to r11,
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* then loads new ss, cs, and rip from previously programmed MSRs.
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* rflags gets masked by a value from another MSR (so CLD and CLAC
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* are not needed). SYSCALL does not save anything on the stack
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* and does not change rsp.
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*
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* Note: rflags saving+masking-with-MSR happens only in Long mode
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* (in legacy 32bit mode, IF, RF and VM bits are cleared and that's it).
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* (in legacy 32-bit mode, IF, RF and VM bits are cleared and that's it).
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* Don't get confused: rflags saving+masking depends on Long Mode Active bit
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* (EFER.LMA=1), NOT on bitness of userspace where SYSCALL executes
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* or target CS descriptor's L bit (SYSCALL does not read segment descriptors).
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@ -296,12 +295,12 @@ ENTRY(ia32_cstar_target)
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* it is too small to ever cause noticeable irq latency.
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*/
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SWAPGS_UNSAFE_STACK
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movl %esp,%r8d
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movq PER_CPU_VAR(cpu_current_top_of_stack),%rsp
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movl %esp, %r8d
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movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp
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ENABLE_INTERRUPTS(CLBR_NONE)
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/* Zero-extending 32-bit regs, do not remove */
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movl %eax,%eax
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movl %eax, %eax
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/* Construct struct pt_regs on stack */
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pushq $__USER32_DS /* pt_regs->ss */
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@ -314,55 +313,58 @@ ENTRY(ia32_cstar_target)
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pushq %rsi /* pt_regs->si */
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pushq %rdx /* pt_regs->dx */
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pushq %rbp /* pt_regs->cx */
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movl %ebp,%ecx
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movl %ebp, %ecx
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pushq $-ENOSYS /* pt_regs->ax */
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sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */
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sub $(10*8), %rsp /* pt_regs->r8-11, bp, bx, r12-15 not saved */
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/*
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* no need to do an access_ok check here because r8 has been
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* 32bit zero extended
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* No need to do an access_ok check here because r8 has been
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* 32-bit zero extended:
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*/
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ASM_STAC
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1: movl (%r8),%ebp
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_ASM_EXTABLE(1b,ia32_badarg)
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1: movl (%r8), %ebp
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_ASM_EXTABLE(1b, ia32_badarg)
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ASM_CLAC
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orl $TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
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testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
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jnz cstar_tracesys
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cstar_do_call:
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/* 32bit syscall -> 64bit C ABI argument conversion */
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movl %edi,%r8d /* arg5 */
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movl %ebp,%r9d /* arg6 */
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xchg %ecx,%esi /* rsi:arg2, rcx:arg4 */
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movl %ebx,%edi /* arg1 */
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movl %edx,%edx /* arg3 (zero extension) */
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/* 32-bit syscall -> 64-bit C ABI argument conversion */
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movl %edi, %r8d /* arg5 */
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movl %ebp, %r9d /* arg6 */
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xchg %ecx, %esi /* rsi:arg2, rcx:arg4 */
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movl %ebx, %edi /* arg1 */
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movl %edx, %edx /* arg3 (zero extension) */
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cstar_dispatch:
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cmpq $(IA32_NR_syscalls-1),%rax
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cmpq $(IA32_NR_syscalls-1), %rax
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ja 1f
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call *ia32_sys_call_table(,%rax,8)
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movq %rax,RAX(%rsp)
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call *ia32_sys_call_table(, %rax, 8)
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movq %rax, RAX(%rsp)
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1:
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DISABLE_INTERRUPTS(CLBR_NONE)
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TRACE_IRQS_OFF
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testl $_TIF_ALLWORK_MASK, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
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jnz sysretl_audit
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testl $_TIF_ALLWORK_MASK, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
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jnz sysretl_audit
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sysretl_from_sys_call:
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andl $~TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
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andl $~TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
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movl RCX(%rsp), %ebp
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RESTORE_RSI_RDI_RDX
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movl RIP(%rsp),%ecx
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movl EFLAGS(%rsp),%r11d
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xorq %r10,%r10
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xorq %r9,%r9
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xorq %r8,%r8
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movl RIP(%rsp), %ecx
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movl EFLAGS(%rsp), %r11d
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xorq %r10, %r10
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xorq %r9, %r9
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xorq %r8, %r8
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TRACE_IRQS_ON
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movl RSP(%rsp),%esp
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movl RSP(%rsp), %esp
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/*
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* 64bit->32bit SYSRET restores eip from ecx,
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* 64-bit->32-bit SYSRET restores eip from ecx,
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* eflags from r11 (but RF and VM bits are forced to 0),
|
||||
* cs and ss are loaded from MSRs.
|
||||
* (Note: 32bit->32bit SYSRET is different: since r11
|
||||
* (Note: 32-bit->32-bit SYSRET is different: since r11
|
||||
* does not exist, it merely sets eflags.IF=1).
|
||||
*
|
||||
* NB: On AMD CPUs with the X86_BUG_SYSRET_SS_ATTRS bug, the ss
|
||||
@ -377,8 +379,8 @@ sysretl_from_sys_call:
|
||||
#ifdef CONFIG_AUDITSYSCALL
|
||||
cstar_auditsys:
|
||||
auditsys_entry_common
|
||||
movl %ebp, %r9d /* reload 6th syscall arg */
|
||||
jmp cstar_dispatch
|
||||
movl %ebp, %r9d /* reload 6th syscall arg */
|
||||
jmp cstar_dispatch
|
||||
|
||||
sysretl_audit:
|
||||
auditsys_exit sysretl_from_sys_call
|
||||
@ -386,16 +388,16 @@ sysretl_audit:
|
||||
|
||||
cstar_tracesys:
|
||||
#ifdef CONFIG_AUDITSYSCALL
|
||||
testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
|
||||
jz cstar_auditsys
|
||||
testl $(_TIF_WORK_SYSCALL_ENTRY & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
|
||||
jz cstar_auditsys
|
||||
#endif
|
||||
SAVE_EXTRA_REGS
|
||||
xorl %eax, %eax /* do not leak kernel information */
|
||||
xorl %eax, %eax /* Do not leak kernel information */
|
||||
movq %rax, R11(%rsp)
|
||||
movq %rax, R10(%rsp)
|
||||
movq %rax, R9(%rsp)
|
||||
movq %rax, R8(%rsp)
|
||||
movq %rsp, %rdi /* &pt_regs -> arg1 */
|
||||
movq %rsp, %rdi /* &pt_regs -> arg1 */
|
||||
call syscall_trace_enter
|
||||
|
||||
/* Reload arg registers from stack. (see sysenter_tracesys) */
|
||||
@ -403,24 +405,24 @@ cstar_tracesys:
|
||||
movl RDX(%rsp), %edx
|
||||
movl RSI(%rsp), %esi
|
||||
movl RDI(%rsp), %edi
|
||||
movl %eax, %eax /* zero extension */
|
||||
movl %eax, %eax /* zero extension */
|
||||
|
||||
RESTORE_EXTRA_REGS
|
||||
jmp cstar_do_call
|
||||
END(ia32_cstar_target)
|
||||
|
||||
|
||||
ia32_badarg:
|
||||
ASM_CLAC
|
||||
movq $-EFAULT,%rax
|
||||
jmp ia32_sysret
|
||||
movq $-EFAULT, %rax
|
||||
jmp ia32_sysret
|
||||
|
||||
ia32_ret_from_sys_call:
|
||||
xorl %eax, %eax /* do not leak kernel information */
|
||||
xorl %eax, %eax /* Do not leak kernel information */
|
||||
movq %rax, R11(%rsp)
|
||||
movq %rax, R10(%rsp)
|
||||
movq %rax, R9(%rsp)
|
||||
movq %rax, R8(%rsp)
|
||||
jmp int_ret_from_sys_call
|
||||
jmp int_ret_from_sys_call
|
||||
|
||||
/*
|
||||
* Emulated IA32 system calls via int 0x80.
|
||||
@ -454,7 +456,7 @@ ENTRY(ia32_syscall)
|
||||
ENABLE_INTERRUPTS(CLBR_NONE)
|
||||
|
||||
/* Zero-extending 32-bit regs, do not remove */
|
||||
movl %eax,%eax
|
||||
movl %eax, %eax
|
||||
|
||||
/* Construct struct pt_regs on stack (iret frame is already on stack) */
|
||||
pushq %rax /* pt_regs->orig_ax */
|
||||
@ -468,30 +470,33 @@ ENTRY(ia32_syscall)
|
||||
pushq $0 /* pt_regs->r10 */
|
||||
pushq $0 /* pt_regs->r11 */
|
||||
cld
|
||||
sub $(6*8),%rsp /* pt_regs->bp,bx,r12-15 not saved */
|
||||
sub $(6*8), %rsp /* pt_regs->bp, bx, r12-15 not saved */
|
||||
|
||||
orl $TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
|
||||
testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
|
||||
jnz ia32_tracesys
|
||||
|
||||
orl $TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
|
||||
testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
|
||||
jnz ia32_tracesys
|
||||
ia32_do_call:
|
||||
/* 32bit syscall -> 64bit C ABI argument conversion */
|
||||
movl %edi,%r8d /* arg5 */
|
||||
movl %ebp,%r9d /* arg6 */
|
||||
xchg %ecx,%esi /* rsi:arg2, rcx:arg4 */
|
||||
movl %ebx,%edi /* arg1 */
|
||||
movl %edx,%edx /* arg3 (zero extension) */
|
||||
cmpq $(IA32_NR_syscalls-1),%rax
|
||||
/* 32-bit syscall -> 64-bit C ABI argument conversion */
|
||||
movl %edi, %r8d /* arg5 */
|
||||
movl %ebp, %r9d /* arg6 */
|
||||
xchg %ecx, %esi /* rsi:arg2, rcx:arg4 */
|
||||
movl %ebx, %edi /* arg1 */
|
||||
movl %edx, %edx /* arg3 (zero extension) */
|
||||
cmpq $(IA32_NR_syscalls-1), %rax
|
||||
ja 1f
|
||||
call *ia32_sys_call_table(,%rax,8) # xxx: rip relative
|
||||
|
||||
call *ia32_sys_call_table(, %rax, 8) /* RIP relative */
|
||||
|
||||
ia32_sysret:
|
||||
movq %rax,RAX(%rsp)
|
||||
movq %rax, RAX(%rsp)
|
||||
1:
|
||||
jmp int_ret_from_sys_call
|
||||
jmp int_ret_from_sys_call
|
||||
|
||||
ia32_tracesys:
|
||||
SAVE_EXTRA_REGS
|
||||
movq %rsp,%rdi /* &pt_regs -> arg1 */
|
||||
call syscall_trace_enter
|
||||
movq %rsp, %rdi /* &pt_regs -> arg1 */
|
||||
call syscall_trace_enter
|
||||
/*
|
||||
* Reload arg registers from stack in case ptrace changed them.
|
||||
* Don't reload %eax because syscall_trace_enter() returned
|
||||
@ -503,33 +508,33 @@ ia32_tracesys:
|
||||
movl RDX(%rsp), %edx
|
||||
movl RSI(%rsp), %esi
|
||||
movl RDI(%rsp), %edi
|
||||
movl %eax, %eax /* zero extension */
|
||||
movl %eax, %eax /* zero extension */
|
||||
RESTORE_EXTRA_REGS
|
||||
jmp ia32_do_call
|
||||
jmp ia32_do_call
|
||||
END(ia32_syscall)
|
||||
|
||||
.macro PTREGSCALL label, func
|
||||
ALIGN
|
||||
GLOBAL(\label)
|
||||
leaq \func(%rip),%rax
|
||||
jmp ia32_ptregs_common
|
||||
leaq \func(%rip), %rax
|
||||
jmp ia32_ptregs_common
|
||||
.endm
|
||||
|
||||
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn
|
||||
PTREGSCALL stub32_sigreturn, sys32_sigreturn
|
||||
PTREGSCALL stub32_fork, sys_fork
|
||||
PTREGSCALL stub32_vfork, sys_vfork
|
||||
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn
|
||||
PTREGSCALL stub32_sigreturn, sys32_sigreturn
|
||||
PTREGSCALL stub32_fork, sys_fork
|
||||
PTREGSCALL stub32_vfork, sys_vfork
|
||||
|
||||
ALIGN
|
||||
GLOBAL(stub32_clone)
|
||||
leaq sys_clone(%rip),%rax
|
||||
leaq sys_clone(%rip), %rax
|
||||
mov %r8, %rcx
|
||||
jmp ia32_ptregs_common
|
||||
jmp ia32_ptregs_common
|
||||
|
||||
ALIGN
|
||||
ia32_ptregs_common:
|
||||
SAVE_EXTRA_REGS 8
|
||||
call *%rax
|
||||
call *%rax
|
||||
RESTORE_EXTRA_REGS 8
|
||||
ret
|
||||
END(ia32_ptregs_common)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user