x86: ia32 ptrace vs -ENOSYS sysenter/syscall

[sfrench/cifs-2.6.git] / arch / x86 / ia32 / ia32entry.S

diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index df588f0f76e1c9c3d8027a3baced0089de612832..ae7158bce4d62d6b0ec1bfec5c52ead3b3e48049 100644 (file)
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -12,7 +12,6 @@
 #include <asm/ia32_unistd.h>   
 #include <asm/thread_info.h>   
 #include <asm/segment.h>
-#include <asm/vsyscall32.h>
 #include <asm/irqflags.h>
 #include <linux/linkage.h>
 
@@ -104,7 +103,7 @@ ENTRY(ia32_sysenter_target)
        pushfq
        CFI_ADJUST_CFA_OFFSET 8
        /*CFI_REL_OFFSET rflags,0*/
-       movl    $VSYSCALL32_SYSEXIT, %r10d
+       movl    8*3-THREAD_SIZE+threadinfo_sysenter_return(%rsp), %r10d
        CFI_REGISTER rip,r10
        pushq   $__USER32_CS
        CFI_ADJUST_CFA_OFFSET 8
@@ -142,6 +141,8 @@ sysenter_do_call:
        andl    $~TS_COMPAT,threadinfo_status(%r10)
        /* clear IF, that popfq doesn't enable interrupts early */
        andl  $~0x200,EFLAGS-R11(%rsp) 
+       movl    RIP-R11(%rsp),%edx              /* User %eip */
+       CFI_REGISTER rip,rdx
        RESTORE_ARGS 1,24,1,1,1,1
        popfq
        CFI_ADJUST_CFA_OFFSET -8
@@ -149,8 +150,6 @@ sysenter_do_call:
        popq    %rcx                            /* User %esp */
        CFI_ADJUST_CFA_OFFSET -8
        CFI_REGISTER rsp,rcx
-       movl    $VSYSCALL32_SYSEXIT,%edx        /* User %eip */
-       CFI_REGISTER rip,rdx
        TRACE_IRQS_ON
        swapgs
        sti             /* sti only takes effect after the next instruction */
@@ -163,12 +162,14 @@ sysenter_tracesys:
        SAVE_REST
        CLEAR_RREGS
        movq    %r9,R9(%rsp)
-       movq    $-ENOSYS,RAX(%rsp)      /* really needed? */
+       movq    $-ENOSYS,RAX(%rsp)/* ptrace can change this for a bad syscall */
        movq    %rsp,%rdi        /* &pt_regs -> arg1 */
        call    syscall_trace_enter
        LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
        RESTORE_REST
        xchgl   %ebp,%r9d
+       cmpl    $(IA32_NR_syscalls-1),%eax
+       ja      int_ret_from_sys_call /* sysenter_tracesys has set RAX(%rsp) */
        jmp     sysenter_do_call
        CFI_ENDPROC
 ENDPROC(ia32_sysenter_target)
@@ -262,13 +263,15 @@ cstar_tracesys:
        SAVE_REST
        CLEAR_RREGS
        movq %r9,R9(%rsp)
-       movq $-ENOSYS,RAX(%rsp) /* really needed? */
+       movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
        movq %rsp,%rdi        /* &pt_regs -> arg1 */
        call syscall_trace_enter
        LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
        RESTORE_REST
        xchgl %ebp,%r9d
        movl RSP-ARGOFFSET(%rsp), %r8d
+       cmpl $(IA32_NR_syscalls-1),%eax
+       ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */
        jmp cstar_do_call
 END(ia32_cstar_target)
                                
@@ -326,7 +329,7 @@ ENTRY(ia32_syscall)
        jnz ia32_tracesys
 ia32_do_syscall:       
        cmpl $(IA32_NR_syscalls-1),%eax
-       ja  ia32_badsys
+       ja  int_ret_from_sys_call       /* ia32_tracesys has set RAX(%rsp) */
        IA32_ARG_FIXUP
        call *ia32_sys_call_table(,%rax,8) # xxx: rip relative
 ia32_sysret:
@@ -336,7 +339,7 @@ ia32_sysret:
 ia32_tracesys:                  
        SAVE_REST
        CLEAR_RREGS
-       movq $-ENOSYS,RAX(%rsp) /* really needed? */
+       movq $-ENOSYS,RAX(%rsp) /* ptrace can change this for a bad syscall */
        movq %rsp,%rdi        /* &pt_regs -> arg1 */
        call syscall_trace_enter
        LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
@@ -644,8 +647,8 @@ ia32_sys_call_table:
        .quad compat_sys_futex          /* 240 */
        .quad compat_sys_sched_setaffinity
        .quad compat_sys_sched_getaffinity
-       .quad sys32_set_thread_area
-       .quad sys32_get_thread_area
+       .quad sys_set_thread_area
+       .quad sys_get_thread_area
        .quad compat_sys_io_setup       /* 245 */
        .quad sys_io_destroy
        .quad compat_sys_io_getevents
@@ -723,7 +726,9 @@ ia32_sys_call_table:
        .quad sys_epoll_pwait
        .quad compat_sys_utimensat      /* 320 */
        .quad compat_sys_signalfd
-       .quad compat_sys_timerfd
+       .quad sys_timerfd_create
        .quad sys_eventfd
        .quad sys32_fallocate
+       .quad compat_sys_timerfd_settime        /* 325 */
+       .quad compat_sys_timerfd_gettime
 ia32_syscall_end: