x86_64: Zero extend all registers after ptrace in 32bit entry path.

[sfrench/cifs-2.6.git] / arch / x86_64 / ia32 / ia32entry.S

diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index 3f66e970d86fc692f4a4d1b205e87de279d76351..18b23181090808b953f91568d6183345b8028fd1 100644 (file)
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -38,6 +38,18 @@
        movq    %rax,R8(%rsp)
        .endm
 
+       .macro LOAD_ARGS32 offset
+       movl \offset(%rsp),%r11d
+       movl \offset+8(%rsp),%r10d
+       movl \offset+16(%rsp),%r9d
+       movl \offset+24(%rsp),%r8d
+       movl \offset+40(%rsp),%ecx
+       movl \offset+48(%rsp),%edx
+       movl \offset+56(%rsp),%esi
+       movl \offset+64(%rsp),%edi
+       movl \offset+72(%rsp),%eax
+       .endm
+       
        .macro CFI_STARTPROC32 simple
        CFI_STARTPROC   \simple
        CFI_UNDEFINED   r8
@@ -104,7 +116,7 @@ ENTRY(ia32_sysenter_target)
        pushq   %rax
        CFI_ADJUST_CFA_OFFSET 8
        cld
-       SAVE_ARGS 0,0,0
+       SAVE_ARGS 0,0,1
        /* no need to do an access_ok check here because rbp has been
           32bit zero extended */ 
 1:     movl    (%rbp),%r9d
@@ -152,7 +164,7 @@ sysenter_tracesys:
        movq    $-ENOSYS,RAX(%rsp)      /* really needed? */
        movq    %rsp,%rdi        /* &pt_regs -> arg1 */
        call    syscall_trace_enter
-       LOAD_ARGS ARGOFFSET  /* reload args from stack in case ptrace changed it */
+       LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
        RESTORE_REST
        movl    %ebp, %ebp
        /* no need to do an access_ok check here because rbp has been
@@ -255,7 +267,7 @@ cstar_tracesys:
        movq $-ENOSYS,RAX(%rsp) /* really needed? */
        movq %rsp,%rdi        /* &pt_regs -> arg1 */
        call syscall_trace_enter
-       LOAD_ARGS ARGOFFSET  /* reload args from stack in case ptrace changed it */
+       LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
        RESTORE_REST
        movl RSP-ARGOFFSET(%rsp), %r8d
        /* no need to do an access_ok check here because r8 has been
@@ -294,7 +306,7 @@ ia32_badarg:
  */                            
 
 ENTRY(ia32_syscall)
-       CFI_STARTPROC   simple
+       CFI_STARTPROC32 simple
        CFI_SIGNAL_FRAME
        CFI_DEF_CFA     rsp,SS+8-RIP
        /*CFI_REL_OFFSET        ss,SS-RIP*/
@@ -330,10 +342,11 @@ ia32_sysret:
 
 ia32_tracesys:                  
        SAVE_REST
+       CLEAR_RREGS
        movq $-ENOSYS,RAX(%rsp) /* really needed? */
        movq %rsp,%rdi        /* &pt_regs -> arg1 */
        call syscall_trace_enter
-       LOAD_ARGS ARGOFFSET  /* reload args from stack in case ptrace changed it */
+       LOAD_ARGS32 ARGOFFSET  /* reload args from stack in case ptrace changed it */
        RESTORE_REST
        jmp ia32_do_syscall
 END(ia32_syscall)