Subversion Repositories hf-risc

#=========================================================================

# crt0.S : Entry point for RISC-V user programs

#=========================================================================

  .text

  .global _start

_start:

  # Initialize global pointer

1:auipc gp, %pcrel_hi(_gp)

  addi  gp, gp, %pcrel_lo(1b)

# clear the bss segment

  la      t0, _fbss

  la      t1, _end

1:

#ifdef __riscv64

  sd      zero,0(t0)

  addi    t0, t0, 8

#else

  sw      zero,0(t0)

  addi    t0, t0, 4

#endif

  bltu    t0, t1, 1b

  la      a0, __libc_fini_array   # Register global termination functions

  call    atexit                  #  to be called upon exit

  call    __libc_init_array       # Run global initialization functions

  lw      a0, 0(sp)               # a0 = argc

  addi    a1, sp, _RISCV_SZPTR/8  # a1 = argv

  li      a2, 0                   # a2 = envp = NULL

  call    main

  tail    exit

  .global _init

  .global _fini

_init:

_fini:

  # These don't have to do anything since we use init_array/fini_array.

  ret