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Project/Src/rt-thread/libcpu/nios/nios_ii/vector.S

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+.set noat
+
+.globl .Lexception_exit
+
+.section .exceptions.exit.label
+.Lexception_exit:
+.section .exceptions.exit, "xa"
+        ldw r5, 68(sp)
+
+        /* get exception back */
+        ldw ea, 72(sp)
+
+        /* if(rt_thread_switch_interrupt_flag == 0) goto no_need_context */
+        ldw r4,%gprel(rt_thread_switch_interrupt_flag)(gp)
+        beq r4,zero,no_need_context
+
+need_context:
+        movia ea, rt_hw_context_switch_interrupt_do
+        /* disable interrupt */
+        mov r5, zero
+
+no_need_context:
+        ldw ra,  0(sp)
+
+        wrctl estatus, r5
+
+        /*
+         * Leave a gap in the stack frame at 4(sp) for the muldiv handler to
+         * store zero into.
+         */
+
+        ldw   r1,   8(sp)
+        ldw   r2,  12(sp)
+        ldw   r3,  16(sp)
+        ldw   r4,  20(sp)
+        ldw   r5,  24(sp)
+        ldw   r6,  28(sp)
+        ldw   r7,  32(sp)
+        ldw   r8,  36(sp)
+        ldw   r9,  40(sp)
+        ldw   r10, 44(sp)
+        ldw   r11, 48(sp)
+        ldw   r12, 52(sp)
+        ldw   r13, 56(sp)
+        ldw   r14, 60(sp)
+        ldw   r15, 64(sp)
+
+        addi  sp, sp, 76
+
+        eret
+