riscv,*.S: use pesudo instruction call

* let the linker perform relaxation

am/src/riscv/nemu/start.S

@@ -5,6 +5,6 @@
 _start:
   mv s0, zero
   la sp, _stack_pointer
-  jal _trm_init
+  call _trm_init
 
 .size _start, . - _start

am/src/riscv/nemu/trap.S

@@ -58,7 +58,7 @@ __am_asm_trap:
   csrw mstatus, t1
 
   mv a0, sp
-  jal __am_irq_handle
+  call __am_irq_handle
 
   LOAD t1, OFFSET_STATUS(sp)
   LOAD t2, OFFSET_EPC(sp)

am/src/riscv/npc/libgcc/div.S

@@ -40,7 +40,7 @@ FUNC_BEGIN (__udivsi3)
   sll    a0, a0, 32
   sll    a1, a1, 32
   move   t0, ra
-  jal    HIDDEN_JUMPTARGET(__udivdi3)
+  call    HIDDEN_JUMPTARGET(__udivdi3)
   sext.w a0, a0
   jr     t0
 FUNC_END (__udivsi3)
@@ -52,7 +52,7 @@ FUNC_BEGIN (__umodsi3)
   srl    a0, a0, 32
   srl    a1, a1, 32
   move   t0, ra
-  jal    HIDDEN_JUMPTARGET(__udivdi3)
+  call    HIDDEN_JUMPTARGET(__udivdi3)
   sext.w a0, a1
   jr     t0
 FUNC_END (__umodsi3)
@@ -100,7 +100,7 @@ HIDDEN_DEF (__udivdi3)
 FUNC_BEGIN (__umoddi3)
   /* Call __udivdi3(a0, a1), then return the remainder, which is in a1.  */
   move  t0, ra
-  jal   HIDDEN_JUMPTARGET(__udivdi3)
+  call   HIDDEN_JUMPTARGET(__udivdi3)
   move  a0, a1
   jr    t0
 FUNC_END (__umoddi3)
@@ -117,7 +117,7 @@ FUNC_END (__umoddi3)
   neg   a1, a1
 .L12:
   move  t0, ra
-  jal   HIDDEN_JUMPTARGET(__udivdi3)
+  call   HIDDEN_JUMPTARGET(__udivdi3)
   neg   a0, a0
   jr    t0
 FUNC_END (__divdi3)
@@ -127,7 +127,7 @@ FUNC_BEGIN (__moddi3)
   bltz   a1, .L31
   bltz   a0, .L32
 .L30:
-  jal    HIDDEN_JUMPTARGET(__udivdi3)    /* The dividend is not negative.  */
+  call    HIDDEN_JUMPTARGET(__udivdi3)    /* The dividend is not negative.  */
   move   a0, a1
   jr     t0
 .L31:
@@ -135,7 +135,7 @@ FUNC_BEGIN (__moddi3)
   bgez   a0, .L30
 .L32:
   neg    a0, a0
-  jal    HIDDEN_JUMPTARGET(__udivdi3)    /* The dividend is hella negative.  */
+  call    HIDDEN_JUMPTARGET(__udivdi3)    /* The dividend is hella negative.  */
   neg    a0, a1
   jr     t0
 FUNC_END (__moddi3)

am/src/riscv/npc/start.S

@@ -5,4 +5,4 @@
 _start:
   mv s0, zero
   la sp, _stack_pointer
-  jal _trm_init
+  call _trm_init