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Diffstat (limited to 'libgloss/riscv/crt0.S')
| -rw-r--r-- | libgloss/riscv/crt0.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/libgloss/riscv/crt0.S b/libgloss/riscv/crt0.S new file mode 100644 index 000000000..35195690c --- /dev/null +++ b/libgloss/riscv/crt0.S @@ -0,0 +1,54 @@ +/* Copyright (c) 2017 SiFive Inc. All rights reserved. + + This copyrighted material is made available to anyone wishing to use, + modify, copy, or redistribute it subject to the terms and conditions + of the BSD License. This program is distributed in the hope that + it will be useful, but WITHOUT ANY WARRANTY expressed or implied, + including the implied warranties of MERCHANTABILITY or FITNESS FOR + A PARTICULAR PURPOSE. A copy of this license is available at + http://www.opensource.org/licenses. +*/ + +#========================================================================= +# crt0.S : Entry point for RISC-V user programs +#========================================================================= + + .text + .global _start + .type _start, @function +_start: + # Initialize global pointer +.option push +.option norelax +1:auipc gp, %pcrel_hi(__global_pointer$) + addi gp, gp, %pcrel_lo(1b) +.option pop + + # Clear the bss segment + la a0, _edata + la a2, _end + sub a2, a2, a0 + li a1, 0 + call memset + + 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, __SIZEOF_POINTER__ # a1 = argv + li a2, 0 # a2 = envp = NULL + call main + tail exit + .size _start, .-_start + + .global _init + .type _init, @function + .global _fini + .type _fini, @function +_init: +_fini: + # These don't have to do anything since we use init_array/fini_array. + ret + .size _init, .-_init + .size _fini, .-_fini |