[Xen-devel] [PATCH 12/14] xen: arm: handle hypercalls from 64-bit guests

[Ian Campbell <ijc@xxxxxxxxxxxxxx>]

From: Ian Campbell <ian.campbell@xxxxxxxxxx>

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/traps.c            |   67 ++++++++++++++++++++++++++++-----------
 xen/include/asm-arm/processor.h |    7 ++--
 2 files changed, 54 insertions(+), 20 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index f1dd557..190d1e8 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -726,8 +726,8 @@ unsigned long do_arch_0(unsigned int cmd, unsigned long 
long value)
         return 0;
 }
 
-typedef unsigned long (*arm_hypercall_fn_t)(
-    unsigned int, unsigned int, unsigned int, unsigned int, unsigned int);
+typedef register_t (*arm_hypercall_fn_t)(
+    register_t, register_t, register_t, register_t, register_t);
 
 typedef struct {
     arm_hypercall_fn_t fn;
@@ -783,30 +783,49 @@ static void do_debug_trap(struct cpu_user_regs *regs, 
unsigned int code)
     }
 }
 
-static void do_trap_hypercall(struct cpu_user_regs *regs, unsigned long iss)
+#ifdef CONFIG_ARM_64
+#define HYPERCALL_RESULT_REG(r) (r)->x0
+#define HYPERCALL_ARG1(r) (r)->x0
+#define HYPERCALL_ARG2(r) (r)->x1
+#define HYPERCALL_ARG3(r) (r)->x2
+#define HYPERCALL_ARG4(r) (r)->x3
+#define HYPERCALL_ARG5(r) (r)->x4
+#define HYPERCALL_ARGS(r) (r)->x0, (r)->x1, (r)->x2, (r)->x3, (r)->x4
+#else
+#define HYPERCALL_RESULT_REG(r) (r)->r0
+#define HYPERCALL_ARG1(r) (r)->r0
+#define HYPERCALL_ARG2(r) (r)->r1
+#define HYPERCALL_ARG3(r) (r)->r2
+#define HYPERCALL_ARG4(r) (r)->r3
+#define HYPERCALL_ARG5(r) (r)->r4
+#define HYPERCALL_ARGS(r) (r)->r0, (r)->r1, (r)->r2, (r)->r3, (r)->r4
+#endif
+
+static void do_trap_hypercall(struct cpu_user_regs *regs, register_t *nr,
+                              unsigned long iss)
 {
     arm_hypercall_fn_t call = NULL;
 #ifndef NDEBUG
-    uint32_t orig_pc = regs->pc;
+    register_t orig_pc = regs->pc;
 #endif
 
     if ( iss != XEN_HYPERCALL_TAG )
         domain_crash_synchronous();
 
-    if ( regs->r12 >= ARRAY_SIZE(arm_hypercall_table) )
+    if ( *nr >= ARRAY_SIZE(arm_hypercall_table) )
     {
-        regs->r0 = -ENOSYS;
+        HYPERCALL_RESULT_REG(regs) = -ENOSYS;
         return;
     }
 
-    call = arm_hypercall_table[regs->r12].fn;
+    call = arm_hypercall_table[*nr].fn;
     if ( call == NULL )
     {
-        regs->r0 = -ENOSYS;
+        HYPERCALL_RESULT_REG(regs) = -ENOSYS;
         return;
     }
 
-    regs->r0 = call(regs->r0, regs->r1, regs->r2, regs->r3, regs->r4);
+    HYPERCALL_RESULT_REG(regs) = call(HYPERCALL_ARGS(regs));
 
 #ifndef NDEBUG
     /*
@@ -815,16 +834,16 @@ static void do_trap_hypercall(struct cpu_user_regs *regs, 
unsigned long iss)
      */
     if ( orig_pc == regs->pc )
     {
-        switch ( arm_hypercall_table[regs->r12].nr_args ) {
-        case 5: regs->r4 = 0xDEADBEEF;
-        case 4: regs->r3 = 0xDEADBEEF;
-        case 3: regs->r2 = 0xDEADBEEF;
-        case 2: regs->r1 = 0xDEADBEEF;
-        case 1: /* Don't clobber r0 -- it's the return value */
+        switch ( arm_hypercall_table[*nr].nr_args ) {
+        case 5: HYPERCALL_ARG5(regs) = 0xDEADBEEF;
+        case 4: HYPERCALL_ARG4(regs) = 0xDEADBEEF;
+        case 3: HYPERCALL_ARG3(regs) = 0xDEADBEEF;
+        case 2: HYPERCALL_ARG2(regs) = 0xDEADBEEF;
+        case 1: /* Don't clobber x0/r0 -- it's the return value */
             break;
         default: BUG();
         }
-        regs->r12 = 0xDEADBEEF;
+        *nr = 0xDEADBEEF;
     }
 #endif
 }
@@ -1079,11 +1098,23 @@ asmlinkage void do_trap_hypervisor(struct cpu_user_regs 
*regs)
             goto bad_trap;
         do_cp15_64(regs, hsr);
         break;
-    case HSR_EC_HVC:
+    case HSR_EC_HVC32:
+#ifndef NDEBUG
+        if ( (hsr.iss & 0xff00) == 0xff00 )
+            return do_debug_trap(regs, hsr.iss & 0x00ff);
+#endif
+        do_trap_hypercall(regs, (register_t *)&regs->r12, hsr.iss);
+        break;
+
+#ifdef CONFIG_ARM_64
+    case HSR_EC_HVC64:
+#ifndef NDEBUG
         if ( (hsr.iss & 0xff00) == 0xff00 )
             return do_debug_trap(regs, hsr.iss & 0x00ff);
-        do_trap_hypercall(regs, hsr.iss);
+#endif
+        do_trap_hypercall(regs, &regs->x16, hsr.iss);
         break;
+#endif
     case HSR_EC_DATA_ABORT_GUEST:
         do_trap_data_abort_guest(regs, hsr.dabt);
         break;
diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index 32c441b..17f5465 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -86,8 +86,11 @@
 #define HSR_EC_JAZELLE              0x09
 #define HSR_EC_BXJ                  0x0a
 #define HSR_EC_CP14_64              0x0c
-#define HSR_EC_SVC                  0x11
-#define HSR_EC_HVC                  0x12
+#define HSR_EC_SVC32                0x11
+#define HSR_EC_HVC32                0x12
+#ifdef CONFIG_ARM_64
+#define HSR_EC_HVC64                0x16
+#endif
 #define HSR_EC_INSTR_ABORT_GUEST    0x20
 #define HSR_EC_INSTR_ABORT_HYP      0x21
 #define HSR_EC_DATA_ABORT_GUEST     0x24
-- 
1.7.10.4


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