diff options
| -rw-r--r-- | arch/x86/ia32/ia32entry.S | 42 |
1 files changed, 14 insertions, 28 deletions
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S index 3cdb9ea..56fd6dd 100644 --- a/arch/x86/ia32/ia32entry.S +++ b/arch/x86/ia32/ia32entry.S @@ -136,7 +136,7 @@ ENTRY(ia32_sysenter_target) pushq_cfi_reg rsi /* pt_regs->si */ pushq_cfi_reg rdx /* pt_regs->dx */ pushq_cfi_reg rcx /* pt_regs->cx */ - pushq_cfi_reg rax /* pt_regs->ax */ + pushq_cfi $-ENOSYS /* pt_regs->ax */ cld sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */ CFI_ADJUST_CFA_OFFSET 10*8 @@ -163,8 +163,6 @@ sysenter_flags_fixed: testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) CFI_REMEMBER_STATE jnz sysenter_tracesys - cmpq $(IA32_NR_syscalls-1),%rax - ja ia32_badsys sysenter_do_call: /* 32bit syscall -> 64bit C ABI argument conversion */ movl %edi,%r8d /* arg5 */ @@ -173,8 +171,11 @@ sysenter_do_call: movl %ebx,%edi /* arg1 */ movl %edx,%edx /* arg3 (zero extension) */ sysenter_dispatch: + cmpq $(IA32_NR_syscalls-1),%rax + ja 1f 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) @@ -241,9 +242,7 @@ sysexit_from_sys_call: movl %ebx,%esi /* 2nd arg: 1st syscall arg */ movl %eax,%edi /* 1st arg: syscall number */ call __audit_syscall_entry - movl RAX(%rsp),%eax /* reload syscall number */ - cmpq $(IA32_NR_syscalls-1),%rax - ja ia32_badsys + 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 */ @@ -294,13 +293,10 @@ sysenter_tracesys: #endif SAVE_EXTRA_REGS CLEAR_RREGS - movq $-ENOSYS,RAX(%rsp)/* ptrace can change this for a bad syscall */ movq %rsp,%rdi /* &pt_regs -> arg1 */ call syscall_trace_enter LOAD_ARGS32 /* reload args from stack in case ptrace changed it */ RESTORE_EXTRA_REGS - cmpq $(IA32_NR_syscalls-1),%rax - ja int_ret_from_sys_call /* sysenter_tracesys has set RAX(%rsp) */ jmp sysenter_do_call CFI_ENDPROC ENDPROC(ia32_sysenter_target) @@ -370,7 +366,7 @@ ENTRY(ia32_cstar_target) pushq_cfi_reg rdx /* pt_regs->dx */ pushq_cfi_reg rbp /* pt_regs->cx */ movl %ebp,%ecx - pushq_cfi_reg rax /* pt_regs->ax */ + pushq_cfi $-ENOSYS /* pt_regs->ax */ sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */ CFI_ADJUST_CFA_OFFSET 10*8 @@ -386,8 +382,6 @@ ENTRY(ia32_cstar_target) testl $_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS) CFI_REMEMBER_STATE jnz cstar_tracesys - cmpq $IA32_NR_syscalls-1,%rax - ja ia32_badsys cstar_do_call: /* 32bit syscall -> 64bit C ABI argument conversion */ movl %edi,%r8d /* arg5 */ @@ -396,8 +390,11 @@ cstar_do_call: movl %ebx,%edi /* arg1 */ movl %edx,%edx /* arg3 (zero extension) */ cstar_dispatch: + cmpq $(IA32_NR_syscalls-1),%rax + ja 1f 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) @@ -444,14 +441,11 @@ cstar_tracesys: xchgl %r9d,%ebp SAVE_EXTRA_REGS CLEAR_RREGS r9 - movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */ movq %rsp,%rdi /* &pt_regs -> arg1 */ call syscall_trace_enter LOAD_ARGS32 1 /* reload args from stack in case ptrace changed it */ RESTORE_EXTRA_REGS xchgl %ebp,%r9d - cmpq $(IA32_NR_syscalls-1),%rax - ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */ jmp cstar_do_call END(ia32_cstar_target) @@ -510,7 +504,7 @@ ENTRY(ia32_syscall) pushq_cfi_reg rsi /* pt_regs->si */ pushq_cfi_reg rdx /* pt_regs->dx */ pushq_cfi_reg rcx /* pt_regs->cx */ - pushq_cfi_reg rax /* pt_regs->ax */ + pushq_cfi $-ENOSYS /* pt_regs->ax */ cld sub $(10*8),%rsp /* pt_regs->r8-11,bp,bx,r12-15 not saved */ CFI_ADJUST_CFA_OFFSET 10*8 @@ -518,8 +512,6 @@ ENTRY(ia32_syscall) 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 - cmpq $(IA32_NR_syscalls-1),%rax - ja ia32_badsys ia32_do_call: /* 32bit syscall -> 64bit C ABI argument conversion */ movl %edi,%r8d /* arg5 */ @@ -527,9 +519,12 @@ ia32_do_call: 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 ia32_sysret: movq %rax,RAX(%rsp) +1: ia32_ret_from_sys_call: CLEAR_RREGS jmp int_ret_from_sys_call @@ -537,23 +532,14 @@ ia32_ret_from_sys_call: ia32_tracesys: SAVE_EXTRA_REGS CLEAR_RREGS - movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */ movq %rsp,%rdi /* &pt_regs -> arg1 */ call syscall_trace_enter LOAD_ARGS32 /* reload args from stack in case ptrace changed it */ RESTORE_EXTRA_REGS - cmpq $(IA32_NR_syscalls-1),%rax - ja int_ret_from_sys_call /* ia32_tracesys has set RAX(%rsp) */ jmp ia32_do_call + CFI_ENDPROC END(ia32_syscall) -ia32_badsys: - movq $0,ORIG_RAX(%rsp) - movq $-ENOSYS,%rax - jmp ia32_sysret - - CFI_ENDPROC - .macro PTREGSCALL label, func ALIGN GLOBAL(\label) |
