Reorder guest saved regs to match hyperall order

Move eax next to ebx/ecx/edx in struct lguest_regs on i386, so they
will be located together and allow it to map directly to a struct
hcall_ring entry (which will be renamed struct hcall_args as in a
subsequent patch).

This is in preparation for making the code hcall code architecture
independent.

Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

2 files changed, 3 insertions, 4 deletions

diff --git a/drivers/lguest/x86/switcher_32.S b/drivers/lguest/x86/switcher_32.S
index e66cec5ac240..1010b90b11fc 100644
--- a/drivers/lguest/x86/switcher_32.S
+++ b/drivers/lguest/x86/switcher_32.S
@@ -133,6 +133,7 @@ ENTRY(switch_to_guest)
         // The Guest's register page has been mapped
         // Writable onto our %esp (stack) --
         // We can simply pop off all Guest regs.
+        popl    %eax
         popl    %ebx
         popl    %ecx
         popl    %edx
@@ -140,7 +141,6 @@ ENTRY(switch_to_guest)
         popl    %edi
         popl    %ebp
         popl    %gs
-        popl    %eax
         popl    %fs
         popl    %ds
         popl    %es
@@ -168,7 +168,6 @@ ENTRY(switch_to_guest)
         pushl   %es;                                                    \
         pushl   %ds;                                                    \
         pushl   %fs;                                                    \
-        pushl   %eax;                                                   \
         pushl   %gs;                                                    \
         pushl   %ebp;                                                   \
         pushl   %edi;                                                   \
@@ -176,6 +175,7 @@ ENTRY(switch_to_guest)
         pushl   %edx;                                                   \
         pushl   %ecx;                                                   \
         pushl   %ebx;                                                   \
+        pushl   %eax;                                                   \
         /* Our stack and our code are using segments                    \
          * Set in the TSS and IDT                                       \
          * Yet if we were to touch data we'd use                        \
diff --git a/include/asm-x86/lguest.h b/include/asm-x86/lguest.h
index f10f1c6cc3d1..ccd338460811 100644
--- a/include/asm-x86/lguest.h
+++ b/include/asm-x86/lguest.h
@@ -26,10 +26,9 @@ extern unsigned long default_idt_entries[];
 struct lguest_regs
 {
         /* Manually saved part. */
-        unsigned long ebx, ecx, edx;
+        unsigned long eax, ebx, ecx, edx;
         unsigned long esi, edi, ebp;
         unsigned long gs;
-        unsigned long eax;
         unsigned long fs, ds, es;
         unsigned long trapnum, errcode;
         /* Trap pushed part */