riscv/riscv-rt/link.x

PROVIDE(_stext = ORIGIN(REGION_TEXT));
PROVIDE(_stack_start = ORIGIN(REGION_STACK) + LENGTH(REGION_STACK));
PROVIDE(_max_hart_id = 0);
PROVIDE(_hart_stack_size = 2K);
PROVIDE(_heap_size = 0);

PROVIDE(trap_handler = default_trap_handler);

/* # Pre-initialization function */
/* If the user overrides this using the `#[pre_init]` attribute or by creating a `__pre_init` function,
   then the function this points to will be called before the RAM is initialized. */
PROVIDE(__pre_init = default_pre_init);

PHDRS
{
    load PT_LOAD;
    ram_load PT_LOAD;
    virtual PT_NULL;
}

SECTIONS
{
  .text.dummy ORIGIN(REGION_TEXT) :
  {
    /* This section is intended to make _stext address work */
  } > REGION_TEXT :virtual

  .text ALIGN(_stext,4) :
  {
    /* Put reset handler first in .text section so it ends up as the entry */
    /* point of the program. */
    KEEP(*(.init));
    KEEP(*(.init.rust));
    . = ALIGN(4);
    KEEP(*(.trap));
    KEEP(*(.trap.rust));

    *(.text .text.*);
  } > REGION_TEXT :load

  .rodata ALIGN(4) :
  {
    *(.rodata .rodata.*);
  } > REGION_RODATA :load

  .data ALIGN(4) :
  {
    _sidata = LOADADDR(.data);
    _sdata = .;
    /* Must be called __global_pointer$ for linker relaxations to work. */
    PROVIDE(__global_pointer$ = . + 0x800);
    *(.data .data.*);
    . = ALIGN(4);
    _edata = .;
  } > REGION_DATA AT > REGION_RODATA :ram_load

  .bss :
  {
    _sbss = .;
    *(.bss .bss.*);
    . = ALIGN(4);
    _ebss = .;
  } > REGION_BSS :virtual

  /* fictitious region that represents the memory available for the heap */
  .heap (INFO) :
  {
    _sheap = .;
    . += _heap_size;
    . = ALIGN(4);
    _eheap = .;
  } > REGION_HEAP :virtual

  /* fictitious region that represents the memory available for the stack */
  .stack (INFO) :
  {
    _estack = .;
    . = _stack_start;
    _sstack = .;
  } > REGION_STACK :virtual

  /* fake output .got section */
  /* Dynamic relocations are unsupported. This section is only used to detect
     relocatable code in the input files and raise an error if relocatable code
     is found */
  .got (INFO) :
  {
    KEEP(*(.got .got.*));
  }

  /* Discard .eh_frame, we are not doing unwind on panic so it is not needed */
  /DISCARD/ :
  {
    *(.eh_frame);
  }
}

/* Do not exceed this mark in the error messages above                                    | */
ASSERT(ORIGIN(REGION_TEXT) % 4 == 0, "
ERROR(riscv-rt): the start of the REGION_TEXT must be 4-byte aligned");

ASSERT(ORIGIN(REGION_RODATA) % 4 == 0, "
ERROR(riscv-rt): the start of the REGION_RODATA must be 4-byte aligned");

ASSERT(ORIGIN(REGION_DATA) % 4 == 0, "
ERROR(riscv-rt): the start of the REGION_DATA must be 4-byte aligned");

ASSERT(ORIGIN(REGION_HEAP) % 4 == 0, "
ERROR(riscv-rt): the start of the REGION_HEAP must be 4-byte aligned");

ASSERT(ORIGIN(REGION_TEXT) % 4 == 0, "
ERROR(riscv-rt): the start of the REGION_TEXT must be 4-byte aligned");

ASSERT(ORIGIN(REGION_STACK) % 4 == 0, "
ERROR(riscv-rt): the start of the REGION_STACK must be 4-byte aligned");

ASSERT(_stext % 4 == 0, "
ERROR(riscv-rt): `_stext` must be 4-byte aligned");

ASSERT(_sdata % 4 == 0 && _edata % 4 == 0, "
BUG(riscv-rt): .data is not 4-byte aligned");

ASSERT(_sidata % 4 == 0, "
BUG(riscv-rt): the LMA of .data is not 4-byte aligned");

ASSERT(_sbss % 4 == 0 && _ebss % 4 == 0, "
BUG(riscv-rt): .bss is not 4-byte aligned");

ASSERT(_sheap % 4 == 0, "
BUG(riscv-rt): start of .heap is not 4-byte aligned");

ASSERT(_stext + SIZEOF(.text) < ORIGIN(REGION_TEXT) + LENGTH(REGION_TEXT), "
ERROR(riscv-rt): The .text section must be placed inside the REGION_TEXT region.
Set _stext to an address smaller than 'ORIGIN(REGION_TEXT) + LENGTH(REGION_TEXT)'");

ASSERT(SIZEOF(.stack) > (_max_hart_id + 1) * _hart_stack_size, "
ERROR(riscv-rt): .stack section is too small for allocating stacks for all the harts.
Consider changing `_max_hart_id` or `_hart_stack_size`.");

ASSERT(SIZEOF(.got) == 0, "
.got section detected in the input files. Dynamic relocations are not
supported. If you are linking to C code compiled using the `gcc` crate
then modify your build script to compile the C code _without_ the
-fPIC flag. See the documentation of the `gcc::Config.fpic` method for
details.");

/* Do not exceed this mark in the error messages above                                    | */