code -> fw

1 files changed, 0 insertions, 246 deletions

diff --git a/code/fe310/bsp/gloss/crt0.S b/code/fe310/bsp/gloss/crt0.S
deleted file mode 100644
index 920ee4b..0000000
--- a/code/fe310/bsp/gloss/crt0.S
+++ /dev/null
@@ -1,246 +0,0 @@
-/* Copyright (c) 2017-2018  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 FreeBSD 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 METAL programs. */
-
-.section .text.libgloss.start
-.global _start
-.type   _start, @function
-
-  /* _start is defined by the METAL to have been called with the following
-   * arguments:
-   *   a0: the hart ID of the currently executing hart.  Harts can start at
-   *       any arbitrary point, it's the C library's job to ensure the code is
-   *       safe.
-   *   a1: a pointer to a description of the machine on which this code is
-   *       currently executing.  This is probably 0 on an embedded system
-   *       because they tend to not be dynamically portable.  As such, newlib
-   *       ignores this argument.
-   *   a2: a pointer to a function that must be run after the envirnoment has
-   *       been initialized, but before user code can be expected to be run.
-   *       If this is 0 then there is no function to be run. */
-_start:
-.cfi_startproc
-.cfi_undefined ra
-
-  /* This is a bit funky: it's not usually sane for _start to return, but in
-   * this case we actually want to in order to signal an error to the METAL. */
-  mv s0, ra
-
-  /* Before doing anything we must initialize the global pointer, as we cannot
-   * safely perform any access that may be relaxed without GP being set.  This
-   * is done with relaxation disabled to avoid relaxing the address calculation
-   * to just "addi gp, gp, 0". */
-.option push
-.option norelax
-  la gp, __global_pointer$
-.option pop
-
-  /* The METAL is designed for a bare-metal environment and therefor is expected
-   * to define its own stack pointer.  We also align the stack pointer here
-   * because the only RISC-V ABI that's currently defined mandates 16-byte
-   * stack alignment. */
-  la sp, _sp
-
-  /* Increment by hartid number of stack sizes */
-  li t0, 0
-  la t1, __stack_size
-1:
-  beq t0, a0, 1f
-  add sp, sp, t1
-  addi t0, t0, 1
-  j 1b
-1:
-  andi sp, sp, -16
-
-  /* If we're not hart 0, skip the initialization work */
-  la t0, __metal_boot_hart
-  bne a0, t0, _skip_init
-
-  /* Embedded systems frequently require relocating the data segment before C
-   * code can be run -- for example, the data segment may exist in flash upon
-   * boot and then need to get relocated into a non-persistant writable memory
-   * before C code can execute.  If this is the case we do so here.  This step
-   * is optional: if the METAL provides an environment in which this relocation
-   * is not necessary then it must simply set metal_segment_data_source_start to
-   * be equal to metal_segment_data_target_start. */
-  la t0, metal_segment_data_source_start
-  la t1, metal_segment_data_target_start
-  la t2, metal_segment_data_target_end
-
-  beq t0, t1, 2f
-  bge t1, t2, 2f
-
-1:
-#if __riscv_xlen == 32
-  lw   a0, 0(t0)
-  addi t0, t0, 4
-  sw   a0, 0(t1)
-  addi t1, t1, 4
-  blt  t1, t2, 1b
-#else
-  ld   a0, 0(t0)
-  addi t0, t0, 8
-  sd   a0, 0(t1)
-  addi t1, t1, 8
-  blt  t1, t2, 1b
-#endif
-2:
-
-  /* Copy the ITIM section */
-  la t0, metal_segment_itim_source_start
-  la t1, metal_segment_itim_target_start
-  la t2, metal_segment_itim_target_end
-
-  beq t0, t1, 2f
-  bge t1, t2, 2f
-
-1:
-#if __riscv_xlen == 32
-  lw   a0, 0(t0)
-  addi t0, t0, 4
-  sw   a0, 0(t1)
-  addi t1, t1, 4
-  blt  t1, t2, 1b
-#else
-  ld   a0, 0(t0)
-  addi t0, t0, 8
-  sd   a0, 0(t1)
-  addi t1, t1, 8
-  blt  t1, t2, 1b
-#endif
-2:
-
-  /* Fence all subsequent instruction fetches until after the ITIM writes
-     complete */
-  fence.i
-
-  /* Zero the BSS segment. */
-  la t1, metal_segment_bss_target_start
-  la t2, metal_segment_bss_target_end
-
-  bge t1, t2, 2f
-
-1:
-#if __riscv_xlen == 32
-  sw   x0, 0(t1)
-  addi t1, t1, 4
-  blt  t1, t2, 1b
-#else
-  sd   x0, 0(t1)
-  addi t1, t1, 8
-  blt  t1, t2, 1b
-#endif
-2:
-
-  /* At this point we're in an environment that can execute C code.  The first
-   * thing to do is to make the callback to the parent environment if it's been
-   * requested to do so. */
-  beqz a2, 1f
-  jalr a2
-1:
-
-  /* The RISC-V port only uses new-style constructors and destructors. */
-  la a0, __libc_fini_array
-  call atexit
-  call __libc_init_array
-
-_skip_init:
-
-  /* Synchronize harts so that secondary harts wait until hart 0 finishes
-     initializing */
-  call __metal_synchronize_harts
-
-  /* Check RISC-V isa and enable FS bits if Floating Point architecture. */
-  csrr a5, misa
-  li   a4, 0x10028
-  and  a5, a5, a4
-  beqz a5, 1f
-  csrr a5, mstatus
-  lui  a4, 0x2
-  or   a5, a5, a4
-  csrw mstatus, a5
-  csrwi fcsr, 0
-1:
-
-  /* This is a C runtime, so main() is defined to have some arguments.  Since
-   * there's nothing sane the METAL can pass we don't bother with that but
-   * instead just setup as close to a NOP as we can. */
-  li a0, 1     /* argc=1 */
-  la a1, argv  /* argv = {"libgloss", NULL} */
-  la a2, envp  /* envp = {NULL} */
-  call secondary_main
-
-  /* Call exit to handle libc's cleanup routines.  Under normal contains this
-   * shouldn't even get called, but I'm still not using a tail call here
-   * because returning to the METAL is the right thing to do in pathological
-   * situations. */
-  call exit
-
-  /* And here's where we return.  Again, it's a bit odd but the METAL defines
-   * this as a bad idea (ie, as opposed to leaving it undefined) and at this
-   * point it's really the only thing left to do. */
-  mv ra, s0
-  ret
-
-.cfi_endproc
-
-/* RISC-V systems always use __libc_{init,fini}_array, but for compatibility we
- * define _{init,fini} to do nothing. */
-.global _init
-.type   _init, @function
-.global _fini
-.type   _fini, @function
-_init:
-_fini:
-  ret
-.size _init, .-_init
-.size _fini, .-_fini
-
-/* By default, secondary_main will cause secondary harts to spin forever.
- * Users can redefine secondary_main themselves to run code on secondary harts */
-.weak   secondary_main
-.global secondary_main
-.type   secondary_main, @function
-
-secondary_main:
-  addi sp, sp, -16
-#if __riscv_xlen == 32
-  sw ra, 4(sp)
-#else
-  sd ra, 8(sp)
-#endif
-  csrr t0, mhartid
-  la t1, __metal_boot_hart
-  beq t0, t1, 2f
-1:
-  wfi
-  j 1b
-2:
-  call main
-#if __riscv_xlen == 32
-  lw ra, 4(sp)
-#else
-  ld ra, 8(sp)
-#endif
-  addi sp, sp, 16
-  ret
-
-/* This shim allows main() to be passed a set of arguments that can satisfy the
- * requirements of the C API. */
-.section .rodata.libgloss.start
-argv:
-.dc.a name
-envp:
-.dc.a 0
-name:
-.asciz "libgloss"
-