[xen master] xen/riscv: introduce reset_stack() function

[patchbot@xxxxxxx]

commit 3a07da55e63d110851c36b0dae32a5dcf00c54b9
Author:     Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
AuthorDate: Mon Jun 19 15:47:37 2023 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jun 19 15:47:37 2023 +0200

    xen/riscv: introduce reset_stack() function
    
    The reason for reset_stack() introduction is that stack should be
    reset twice:
    1. Before jumping to C world at the start of _start() function.
    2. After jumping from 1:1 mapping world.
    
    Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
    Reviewed-by: Alistair Francis <alistair.francis@xxxxxxx>
---
 xen/arch/riscv/riscv64/head.S | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/xen/arch/riscv/riscv64/head.S b/xen/arch/riscv/riscv64/head.S
index 8887f0cbd4..2c0304646a 100644
--- a/xen/arch/riscv/riscv64/head.S
+++ b/xen/arch/riscv/riscv64/head.S
@@ -27,8 +27,16 @@ ENTRY(start)
         add     t3, t3, __SIZEOF_POINTER__
         bltu    t3, t4, .L_clear_bss
 
+        jal     reset_stack
+
+        tail    start_xen
+
+        .section .text, "ax", %progbits
+
+ENTRY(reset_stack)
         la      sp, cpu0_boot_stack
         li      t0, STACK_SIZE
         add     sp, sp, t0
 
-        tail    start_xen
+        ret
+
--
generated by git-patchbot for /home/xen/git/xen.git#master