On 14.07.22 16:03, Daniel Cederman wrote:
diff --git a/bsps/riscv/shared/start/start.S b/bsps/riscv/shared/start/start.S
index 3702f8ac2f..21945a99f5 100644
--- a/bsps/riscv/shared/start/start.S
+++ b/bsps/riscv/shared/start/start.S
@@ -35,6 +35,16 @@
#include <bsp/linker-symbols.h>
#include <bspopts.h>
+#if __riscv_xlen == 32
+#define PTR_ALIGN 2
+#define PTR_SIZE 4
+#define PTR_VALUE .word
+#elif __riscv_xlen == 64
+#define PTR_ALIGN 3
+#define PTR_SIZE 8
+#define PTR_VALUE .dword
+#endif
Maybe this should move to asm.h.
+
PUBLIC(_start)
.section .bsp_start_text, "wax", @progbits
@@ -60,6 +70,9 @@ SYM(_start):
LADDR t0, _RISCV_Exception_handler
csrw mtvec, t0
+ /* Save stack pointer so it can mark end of work area later on */
+ mv t3, sp
+
/* Load stack pointer and branch to secondary processor start if
necessary */
#ifdef RTEMS_SMP
LADDR sp, _ISR_Stack_area_begin
@@ -75,6 +88,9 @@ SYM(_start):
LADDR sp, _ISR_Stack_area_end
#endif
+ LADDR t0, riscv_start_stack_pointer
+ SREG t3, 0(t0)
+
#ifdef BSP_START_COPY_FDT_FROM_U_BOOT
mv a0, a1
call bsp_fdt_copy
@@ -146,3 +162,12 @@ SYM(_start):
#endif
#endif /* RTEMS_SMP */
+
+ .section .data, "aw"
This should be .bsp_start_data
+ .align PTR_ALIGN
+
+ .globl riscv_start_stack_pointer
+ .type riscv_start_stack_pointer, @object
+ .size riscv_start_stack_pointer, PTR_SIZE
+riscv_start_stack_pointer:
+ PTR_VALUE 0
--
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