diff options
Diffstat (limited to 'ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S')
-rw-r--r-- | ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S b/ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S index a15ae03e0f..99a1d21ce7 100644 --- a/ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S +++ b/ArmPkg/Library/ArmHvcLib/AArch64/ArmHvc.S @@ -18,8 +18,8 @@ GCC_ASM_EXPORT(ArmCallHvc)
ASM_PFX(ArmCallHvc):
- // Push x0 on the stack
- str x0, [sp, #-8]!
+ // Push x0 on the stack - The stack must always be quad-word aligned
+ str x0, [sp, #-16]!
// Load the HVC arguments values into the appropriate registers
ldp x6, x7, [x0, #48]
@@ -30,9 +30,9 @@ ASM_PFX(ArmCallHvc): hvc #0
// Pop the ARM_HVC_ARGS structure address from the stack into x9
- ldr x9, [sp], #8
+ ldr x9, [sp], #16
- // Store the HVC returned values into the appropriate registers
+ // Store the HVC returned values into the ARM_HVC_ARGS structure.
// A HVC call can return up to 4 values
stp x2, x3, [x9, #16]
stp x0, x1, [x9, #0]
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