riscv: Enable interrupts during syscalls with M-Mode

When running is M-Mode (no MMU config), MPIE does not get set. This
results in all syscalls being executed with interrupts disabled as
handle_exception never sets SR_IE as it always sees SR_PIE being
cleared. Fix this by always force enabling interrupts in
handle_syscall when CONFIG_RISCV_M_MODE is enabled.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index d077630..48de316 100644 (file)
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -155,6 +155,15 @@ skip_context_tracking:
        tail do_trap_unknown
 
 handle_syscall:
+#ifdef CONFIG_RISCV_M_MODE
+       /*
+        * When running is M-Mode (no MMU config), MPIE does not get set.
+        * As a result, we need to force enable interrupts here because
+        * handle_exception did not do set SR_IE as it always sees SR_PIE
+        * being cleared.
+        */
+       csrs CSR_STATUS, SR_IE
+#endif
 #if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING)
        /* Recover a0 - a7 for system calls */
        REG_L a0, PT_A0(sp)