mips: stop backtraces at main()

Initialize ra=0 before calling main so backtraces don't walk
through the startup code.

Change-Id: Ia8796ce38b32d14025b47b3e00061267ee25cbaf

2 files changed, 2 insertions, 2 deletions

diff --git a/firmware/target/mips/ingenic_jz47xx/crt0.S b/firmware/target/mips/ingenic_jz47xx/crt0.S
index 258a5c02fc..1652bea8e5 100644
--- a/firmware/target/mips/ingenic_jz47xx/crt0.S
+++ b/firmware/target/mips/ingenic_jz47xx/crt0.S
@@ -185,7 +185,7 @@ _irq_stack_loop:
     jal     system_main  /* Init clocks etc first */
     ssnop
     j       main
-    ssnop
+    move    ra, zero     /* init backtrace root */
 
 
     /*
diff --git a/firmware/target/mips/ingenic_x1000/crt0.S b/firmware/target/mips/ingenic_x1000/crt0.S
index d079b01e2a..9d89ac1227 100644
--- a/firmware/target/mips/ingenic_x1000/crt0.S
+++ b/firmware/target/mips/ingenic_x1000/crt0.S
@@ -110,7 +110,7 @@ _realstart:
     jal     system_early_init
     nop
     j       main
-    nop
+    move    ra, zero     /* init backtrace root */
 
     /* copy(void* src, void* dst, void* dst_end) */
 _copy: