/*
- * Compatibility mode system call entry point for x86-64.
- *
+ * Compatibility mode system call entry point for x86-64.
+ *
* Copyright 2000-2002 Andi Kleen, SuSE Labs.
- */
-
+ */
#include "calling.h"
#include <asm/asm-offsets.h>
#include <asm/current.h>
#include <asm/errno.h>
-#include <asm/ia32_unistd.h>
-#include <asm/thread_info.h>
+#include <asm/ia32_unistd.h>
+#include <asm/thread_info.h>
#include <asm/segment.h>
#include <asm/irqflags.h>
#include <asm/asm.h>
/* Avoid __ASSEMBLER__'ifying <linux/audit.h> just for this. */
#include <linux/elf-em.h>
#define AUDIT_ARCH_I386 (EM_386|__AUDIT_ARCH_LE)
-#define __AUDIT_ARCH_LE 0x40000000
+#define __AUDIT_ARCH_LE 0x40000000
#ifndef CONFIG_AUDITSYSCALL
-#define sysexit_audit ia32_ret_from_sys_call
-#define sysretl_audit ia32_ret_from_sys_call
+# define sysexit_audit ia32_ret_from_sys_call
+# define sysretl_audit ia32_ret_from_sys_call
#endif
.section .entry.text, "ax"
#endif
/*
- * 32bit SYSENTER instruction entry.
+ * 32-bit SYSENTER instruction entry.
*
* SYSENTER loads ss, rsp, cs, and rip from previously programmed MSRs.
* IF and VM in rflags are cleared (IOW: interrupts are off).
pushq %rbp /* pt_regs->sp */
pushfq /* pt_regs->flags */
pushq $__USER32_CS /* pt_regs->cs */
- pushq %r10 /* pt_regs->ip = thread_info->sysenter_return */
+ pushq %r10 /* pt_regs->ip = thread_info->sysenter_return */
pushq %rax /* pt_regs->orig_ax */
pushq %rdi /* pt_regs->di */
pushq %rsi /* pt_regs->si */
pushq %rcx /* pt_regs->cx */
pushq $-ENOSYS /* pt_regs->ax */
cld
- sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */
+ sub $(10*8), %rsp /* pt_regs->r8-11, bp, bx, r12-15 not saved */
/*
* no need to do an access_ok check here because rbp has been
- * 32bit zero extended
+ * 32-bit zero extended
*/
ASM_STAC
-1: movl (%rbp),%ebp
- _ASM_EXTABLE(1b,ia32_badarg)
+1: movl (%rbp), %ebp
+ _ASM_EXTABLE(1b, ia32_badarg)
ASM_CLAC
/*
* ourselves. To save a few cycles, we can check whether
* NT was set instead of doing an unconditional popfq.
*/
- testl $X86_EFLAGS_NT,EFLAGS(%rsp)
- jnz sysenter_fix_flags
+ testl $X86_EFLAGS_NT, EFLAGS(%rsp)
+ jnz sysenter_fix_flags
sysenter_flags_fixed:
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 sysenter_tracesys
+ jnz sysenter_tracesys
sysenter_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) */
+ /* 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) */
sysenter_dispatch:
- cmpq $(IA32_NR_syscalls-1),%rax
+ cmpq $(IA32_NR_syscalls-1), %rax
ja 1f
- call *ia32_sys_call_table(,%rax,8)
- movq %rax,RAX(%rsp)
+ call *ia32_sys_call_table(, %rax, 8)
+ movq %rax, RAX(%rsp)
1:
DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
* This code path is still called 'sysexit' because it pairs
* with 'sysenter' and it uses the SYSENTER calling convention.
*/
- andl $~TS_COMPAT,ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
- movl RIP(%rsp),%ecx /* User %eip */
+ andl $~TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
+ movl RIP(%rsp), %ecx /* User %eip */
RESTORE_RSI_RDI
- xorl %edx,%edx /* avoid info leaks */
- xorq %r8,%r8
- xorq %r9,%r9
- xorq %r10,%r10
- movl EFLAGS(%rsp),%r11d /* User eflags */
+ xorl %edx, %edx /* Do not leak kernel information */
+ xorq %r8, %r8
+ xorq %r9, %r9
+ xorq %r10, %r10
+ movl EFLAGS(%rsp), %r11d /* User eflags */
TRACE_IRQS_ON
/*
* SYSRETL works even on Intel CPUs. Use it in preference to SYSEXIT,
* since it avoids a dicey window with interrupts enabled.
*/
- movl RSP(%rsp),%esp
+ movl RSP(%rsp), %esp
/*
* USERGS_SYSRET32 does:
#ifdef CONFIG_AUDITSYSCALL
.macro auditsys_entry_common
- movl %esi,%r8d /* 5th arg: 4th syscall arg */
- movl %ecx,%r9d /*swap with edx*/
- movl %edx,%ecx /* 4th arg: 3rd syscall arg */
- movl %r9d,%edx /* 3rd arg: 2nd syscall arg */
- movl %ebx,%esi /* 2nd arg: 1st syscall arg */
- movl %eax,%edi /* 1st arg: syscall number */
- call __audit_syscall_entry
- movl ORIG_RAX(%rsp),%eax /* reload syscall number */
- movl %ebx,%edi /* reload 1st syscall arg */
- movl RCX(%rsp),%esi /* reload 2nd syscall arg */
- movl RDX(%rsp),%edx /* reload 3rd syscall arg */
- movl RSI(%rsp),%ecx /* reload 4th syscall arg */
- movl RDI(%rsp),%r8d /* reload 5th syscall arg */
+ movl %esi, %r8d /* 5th arg: 4th syscall arg */
+ movl %ecx, %r9d /* swap with edx */
+ movl %edx, %ecx /* 4th arg: 3rd syscall arg */
+ movl %r9d, %edx /* 3rd arg: 2nd syscall arg */
+ movl %ebx, %esi /* 2nd arg: 1st syscall arg */
+ movl %eax, %edi /* 1st arg: syscall number */
+ call __audit_syscall_entry
+ movl ORIG_RAX(%rsp), %eax /* reload syscall number */
+ movl %ebx, %edi /* reload 1st syscall arg */
+ movl RCX(%rsp), %esi /* reload 2nd syscall arg */
+ movl RDX(%rsp), %edx /* reload 3rd syscall arg */
+ movl RSI(%rsp), %ecx /* reload 4th syscall arg */
+ movl RDI(%rsp), %r8d /* reload 5th syscall arg */
.endm
.macro auditsys_exit exit
- testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
- jnz ia32_ret_from_sys_call
+ testl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
+ jnz ia32_ret_from_sys_call
TRACE_IRQS_ON
ENABLE_INTERRUPTS(CLBR_NONE)
- movl %eax,%esi /* second arg, syscall return value */
- cmpl $-MAX_ERRNO,%eax /* is it an error ? */
- jbe 1f
- movslq %eax, %rsi /* if error sign extend to 64 bits */
-1: setbe %al /* 1 if error, 0 if not */
- movzbl %al,%edi /* zero-extend that into %edi */
- call __audit_syscall_exit
- movq RAX(%rsp),%rax /* reload syscall return value */
- movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT),%edi
+ movl %eax, %esi /* second arg, syscall return value */
+ cmpl $-MAX_ERRNO, %eax /* is it an error ? */
+ jbe 1f
+ movslq %eax, %rsi /* if error sign extend to 64 bits */
+1: setbe %al /* 1 if error, 0 if not */
+ movzbl %al, %edi /* zero-extend that into %edi */
+ call __audit_syscall_exit
+ movq RAX(%rsp), %rax /* reload syscall return value */
+ movl $(_TIF_ALLWORK_MASK & ~_TIF_SYSCALL_AUDIT), %edi
DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
- testl %edi, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
- jz \exit
- xorl %eax, %eax /* do not leak kernel information */
+ testl %edi, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
+ jz \exit
+ 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_with_check
+ jmp int_with_check
.endm
sysenter_auditsys:
auditsys_entry_common
- movl %ebp,%r9d /* reload 6th syscall arg */
- jmp sysenter_dispatch
+ movl %ebp, %r9d /* reload 6th syscall arg */
+ jmp sysenter_dispatch
sysexit_audit:
auditsys_exit sysexit_from_sys_call
sysenter_fix_flags:
pushq $(X86_EFLAGS_IF|X86_EFLAGS_FIXED)
popfq
- jmp sysenter_flags_fixed
+ jmp sysenter_flags_fixed
sysenter_tracesys:
#ifdef CONFIG_AUDITSYSCALL
jz sysenter_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) */
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 sysenter_do_call
ENDPROC(ia32_sysenter_target)
/*
- * 32bit SYSCALL instruction entry.
+ * 32-bit SYSCALL instruction entry.
*
- * 32bit SYSCALL saves rip to rcx, clears rflags.RF, then saves rflags to r11,
+ * 32-bit SYSCALL saves rip to rcx, clears rflags.RF, then saves rflags to r11,
* then loads new ss, cs, and rip from previously programmed MSRs.
* rflags gets masked by a value from another MSR (so CLD and CLAC
* are not needed). SYSCALL does not save anything on the stack
* and does not change rsp.
*
* Note: rflags saving+masking-with-MSR happens only in Long mode
- * (in legacy 32bit mode, IF, RF and VM bits are cleared and that's it).
+ * (in legacy 32-bit mode, IF, RF and VM bits are cleared and that's it).
* Don't get confused: rflags saving+masking depends on Long Mode Active bit
* (EFER.LMA=1), NOT on bitness of userspace where SYSCALL executes
* or target CS descriptor's L bit (SYSCALL does not read segment descriptors).
* it is too small to ever cause noticeable irq latency.
*/
SWAPGS_UNSAFE_STACK
- movl %esp,%r8d
- movq PER_CPU_VAR(cpu_current_top_of_stack),%rsp
+ movl %esp, %r8d
+ movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp
ENABLE_INTERRUPTS(CLBR_NONE)
/* Zero-extending 32-bit regs, do not remove */
- movl %eax,%eax
+ movl %eax, %eax
/* Construct struct pt_regs on stack */
pushq $__USER32_DS /* pt_regs->ss */
pushq %rsi /* pt_regs->si */
pushq %rdx /* pt_regs->dx */
pushq %rbp /* pt_regs->cx */
- movl %ebp,%ecx
+ movl %ebp, %ecx
pushq $-ENOSYS /* pt_regs->ax */
- sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */
+ sub $(10*8), %rsp /* pt_regs->r8-11, bp, bx, r12-15 not saved */
/*
- * no need to do an access_ok check here because r8 has been
- * 32bit zero extended
+ * No need to do an access_ok check here because r8 has been
+ * 32-bit zero extended:
*/
ASM_STAC
-1: movl (%r8),%ebp
- _ASM_EXTABLE(1b,ia32_badarg)
+1: movl (%r8), %ebp
+ _ASM_EXTABLE(1b, ia32_badarg)
ASM_CLAC
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 cstar_tracesys
cstar_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) */
+ /* 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) */
+
cstar_dispatch:
- cmpq $(IA32_NR_syscalls-1),%rax
+ cmpq $(IA32_NR_syscalls-1), %rax
ja 1f
- call *ia32_sys_call_table(,%rax,8)
- movq %rax,RAX(%rsp)
+
+ call *ia32_sys_call_table(, %rax, 8)
+ movq %rax, RAX(%rsp)
1:
DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
- testl $_TIF_ALLWORK_MASK, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
- jnz sysretl_audit
+ testl $_TIF_ALLWORK_MASK, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
+ jnz sysretl_audit
+
sysretl_from_sys_call:
- andl $~TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
+ andl $~TS_COMPAT, ASM_THREAD_INFO(TI_status, %rsp, SIZEOF_PTREGS)
movl RCX(%rsp), %ebp
RESTORE_RSI_RDI_RDX
- movl RIP(%rsp),%ecx
- movl EFLAGS(%rsp),%r11d
- xorq %r10,%r10
- xorq %r9,%r9
- xorq %r8,%r8
+ movl RIP(%rsp), %ecx
+ movl EFLAGS(%rsp), %r11d
+ xorq %r10, %r10
+ xorq %r9, %r9
+ xorq %r8, %r8
TRACE_IRQS_ON
- movl RSP(%rsp),%esp
+ movl RSP(%rsp), %esp
/*
- * 64bit->32bit SYSRET restores eip from ecx,
+ * 64-bit->32-bit SYSRET restores eip from ecx,
* 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
#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
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) */
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.
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 */
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
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)
git.samba.org / sfrench / cifs-2.6.git / commitdiff