[Xen-changelog] [xen master] xen: arm: select_user_reg support for 64-bit hypervisor

[patchbot@xxxxxxx]

commit 16636d9085c9840157be2c0c5f08a6282b642d27
Author:     Ian Campbell <ian.campbell@xxxxxxxxxx>
AuthorDate: Fri Feb 22 08:58:16 2013 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Fri Feb 22 12:14:55 2013 +0000

    xen: arm: select_user_reg support for 64-bit hypervisor
    
    Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Tim Deegan <tim@xxxxxxx>
---
 xen/arch/arm/traps.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 75d42ab..6be70fa 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -72,6 +72,7 @@ register_t *select_user_reg(struct cpu_user_regs *regs, int 
reg)
 {
     BUG_ON( !guest_mode(regs) );
 
+#ifdef CONFIG_ARM_32
     /*
      * We rely heavily on the layout of cpu_user_regs to avoid having
      * to handle all of the registers individually. Use BUILD_BUG_ON to
@@ -124,6 +125,15 @@ register_t *select_user_reg(struct cpu_user_regs *regs, 
int reg)
         BUG();
     }
 #undef REGOFFS
+#else
+    /* In 64 bit the syndrome register contains the AArch64 register
+     * number even if the trap was from AArch32 mode. Except that
+     * AArch32 R15 (PC) is encoded as 0b11111.
+     */
+    if ( reg == 0x1f /* && is aarch32 guest */)
+        return &regs->pc;
+    return &regs->x0 + reg;
+#endif
 }
 
 static const char *decode_fsc(uint32_t fsc, int *level)
--
generated by git-patchbot for /home/xen/git/xen.git#master

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