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26 Function Calls

The following pseudoinstructions are available to call subroutines far from the current position:

  • call \<symbol\>: call away subroutine

  • call \<rd\>, \<symbol\>: call away subroutine

  • tail \<symbol\>: tail call away subroutine

  • jump \<symbol\>, \<rt\>: jump to far-away label

The following example shows how these pseudoinstructions are used:

  call  func1
  tail  func2
  jump  func3, t0

Which generates the following assembler output and relocations as seen by objdump:

0000000000000000 \<.text>:
   0: 00000097            auipc ra,0x0
      0: R_RISCV_CALL func1
   4: 000080e7            jalr  ra # 0x0
   8: 00000317            auipc t1,0x0
      8: R_RISCV_CALL func2
   c: 00030067            jr  t1 # 0x8
  10: 00000297            auipc t0,0x0
      10: R_RISCV_CALL  func3
  14: 00028067            jr  t0 # 0x10