From 35a8c8f9f6d9ba12bac93a127d024428c6fe3898 Mon Sep 17 00:00:00 2001
From: Dave Berkeley <via@rotwang.co.uk>
Date: Sun, 17 Apr 2022 11:22:19 +0100
Subject: [PATCH] Added init_array support for vexriscv to allow static C++
 ctors and C __attribute__((constructor, priority)) in gcc

---
 litex/soc/cores/cpu/vexriscv/crt0.S | 1 +
 litex/soc/software/bios/linker.ld   | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/litex/soc/cores/cpu/vexriscv/crt0.S b/litex/soc/cores/cpu/vexriscv/crt0.S
index 0496c84be..fa9ead4c3 100644
--- a/litex/soc/cores/cpu/vexriscv/crt0.S
+++ b/litex/soc/cores/cpu/vexriscv/crt0.S
@@ -84,6 +84,7 @@ bss_done:
   li a0, 0x880  //880 enable timer + external interrupt sources (until mstatus.MIE is set, they will never trigger an interrupt)
   csrw mie,a0
 
+  call __libc_init_array
   call main
 infinit_loop:
   j infinit_loop
diff --git a/litex/soc/software/bios/linker.ld b/litex/soc/software/bios/linker.ld
index 66f8b9aff..b18560ac0 100644
--- a/litex/soc/software/bios/linker.ld
+++ b/litex/soc/software/bios/linker.ld
@@ -51,6 +51,15 @@ SECTIONS
 		PROVIDE_HIDDEN (__bios_init_end = .);
 	} > rom
 
+	.init_array :
+	{
+		. = ALIGN(4);
+		__init_array_start = .;
+		KEEP(*(SORT(.init_array.*)))
+		KEEP(*(.init_array))
+		__init_array_end = .;
+	} > rom
+
 	.data :
 	{
 		. = ALIGN(8);