fix risc-v gp(global pointer register) problem

2019-09-24 10:19:57 +08:00
parent 1747cedc61
commit 8ef8fed56e
2 changed files with 5 additions and 1 deletions
--- a/arch/risc-v/common/tos_cpu.c
+++ b/arch/risc-v/common/tos_cpu.c
@@ -99,6 +99,10 @@ __KERNEL__ k_stack_t *cpu_task_stk_init(void *entry,
        #undef _V
    }

+    cpu_data_t gp;
+    asm("mv %0, gp"::"r"(gp));
+
+    regs->gp        = (cpu_data_t)gp;                           // gp: global pointer
    regs->a0        = (cpu_data_t)arg;                          // a0: argument
    regs->ra        = (cpu_data_t)0xACE00ACE;                   // ra: return address
    regs->mstatus   = (cpu_data_t)(MSTATUS_MPP | MSTATUS_MPIE); // return to machine mode and enable interrupt