[newlib-cygwin/main] libgloss: riscv: Fix envp parameter for main

[newlib-cygwin/main] libgloss: riscv: Fix envp parameter for main

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=730703bdb8e1ae671517efaa0b9e273eef52d724

commit 730703bdb8e1ae671517efaa0b9e273eef52d724
Author:     Bernd Edlinger <bernd@edlinger-online.de>
AuthorDate: Thu Apr 11 14:57:11 2024 +0200
Commit:     Corinna Vinschen <corinna@vinschen.de>
CommitDate: Fri Apr 12 11:44:07 2024 +0200

    libgloss: riscv: Fix envp parameter for main
    
    The envp paramter is currently NULL when crt0.S calls main.
    With this patch the envp parameter should now be set correctly.
    Tested with riscv32 and riscv64: both gdb/sim and qemu do work.

Diff:
---
 libgloss/riscv/crt0.S | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libgloss/riscv/crt0.S b/libgloss/riscv/crt0.S
index f1c5419a5eb4..54443e4129dc 100644
--- a/libgloss/riscv/crt0.S
+++ b/libgloss/riscv/crt0.S
@@ -61,7 +61,9 @@ _start:
 
   lw      a0, 0(sp)                  # a0 = argc
   addi    a1, sp, __SIZEOF_POINTER__ # a1 = argv
-  li      a2, 0                      # a2 = envp = NULL
+  slli    a2, a0, 1 + __SIZEOF_POINTER__ >> 2
+  addi    a2, a2, __SIZEOF_POINTER__
+  add     a2, a2, a1                 # a2 = envp
   call    main
   tail    exit
   .size  _start, .-_start