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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use std.textio.all;
package rawfile_pack is
constant elf32_magic : unsigned := x"7F454C46"; -- 0x7f E L F
constant elf32_type_mach : unsigned := x"0002002a"; -- type 2, SuperH
constant elf32_hdr_off : integer := 16; -- skips the e_ident field
constant elf32_phentsize_off : integer := 42; -- size of the segment records
constant elf32_phnum_off : integer := 44; -- pointer to the segment records
constant elf32_pt_load : unsigned := "00000001";
alias byte is character;
type byte_vector is array (positive range <>) of byte;
type byte_f is file of byte;
type rom8_t is array (natural range <>) of std_logic_vector( 7 downto 0);
type rom8_p is access rom8_t;
type rom16_t is array (natural range <>) of std_logic_vector(15 downto 0);
type rom16_p is access rom16_t;
type rom32_t is array (natural range <>) of std_logic_vector(31 downto 0);
type rom32_p is access rom32_t;
type rawfile is record
fn : line;
offs : natural;
end record;
procedure fopen(file f : byte_f; r: inout rawfile; fn: string);
procedure fseek(file f : byte_f; r: inout rawfile; o: natural);
procedure fread(file f : byte_f; r: inout rawfile; b: inout byte);
procedure fread(file f : byte_f; r: inout rawfile; b: inout byte_vector; l: natural);
procedure fread(file f : byte_f; r: inout rawfile; n: inout natural; b: positive);
procedure fread(file f : byte_f; r: inout rawfile; n: inout natural);
procedure fread(file f : byte_f; r: inout rawfile; n: inout unsigned);
procedure fclose(file f: byte_f; r: inout rawfile);
impure function fread_bin(fn: string; l: positive) return rom8_t;
impure function fread_bin(fn: string; l: positive) return rom16_t;
impure function fread_bin(fn: string; l: positive) return rom32_t;
impure function fread_elf(fn: string; l: positive) return rom8_t;
impure function fread_elf(fn: string; l: positive) return rom16_t;
impure function fread_elf(fn: string; l: positive) return rom32_t;
end package;
package body rawfile_pack is
procedure fopen(file f: byte_f; r: inout rawfile; fn: string) is
begin
r.fn := new string'(fn);
r.offs := 0;
file_open(f, r.fn.all, read_mode);
end fopen;
procedure fseek(file f: byte_f; r: inout rawfile; o: natural) is
variable b: byte;
begin
if o < r.offs then
file_close(f);
r.offs := 0;
file_open(f, r.fn.all, read_mode);
end if;
for i in r.offs to o loop
if i /= o then read(f, b); end if;
end loop;
r.offs := o;
end fseek;
procedure fread(file f: byte_f; r: inout rawfile; b: inout byte) is
begin
read(f, b);
r.offs := r.offs + 1;
end fread;
procedure fread(file f: byte_f; r: inout rawfile; b: inout byte_vector; l: natural) is
begin
for i in 1 to l loop
read(f, b(i));
end loop;
r.offs := r.offs + l;
end fread;
procedure fread(file f : byte_f; r: inout rawfile; n: inout natural; b: positive) is
variable o : positive := b/8;
variable s : byte_vector(1 to o);
variable v : natural := 0;
begin
fread(f, r, s, o);
for i in 1 to o loop
v := v*256 + byte'pos(s(i));
end loop;
n := v;
end fread;
procedure fread(file f: byte_f; r: inout rawfile; n: inout natural) is
begin
fread(f, r, n, 32);
end fread;
procedure fread(file f : byte_f; r: inout rawfile; n: inout unsigned) is
variable o : positive := (n'length-1)/8 + 1;
variable s : byte_vector(1 to o);
variable v : unsigned(o*8-1 downto 0) := (others => '0');
begin
fread(f, r, s, o);
for i in 1 to o loop
v := v(o*8-9 downto 0) & to_unsigned(byte'pos(s(i)), 8);
end loop;
n := v((n'length-1) downto 0);
end fread;
procedure fclose(file f: byte_f; r: inout rawfile) is
begin
file_close(f);
deallocate(r.fn);
end fclose;
impure function fread_bin(fn: string; l: positive) return rom8_t is
file f : byte_f;
variable fd: rawfile;
variable r : rom8_p;
variable u : unsigned( 7 downto 0);
begin
r := new rom8_t(0 to l-1);
r.all := (others => (others => '0'));
fopen(f, fd, fn);
for i in 0 to l loop
exit when endfile(f);
assert i<l report "ROM contents overrun" severity warning;
fread(f, fd, u);
r.all(i) := std_logic_vector(u);
end loop;
fclose(f, fd);
return r.all;
end fread_bin;
impure function fread_bin(fn: string; l: positive) return rom16_t is
file f : byte_f;
variable fd: rawfile;
variable r : rom16_p;
variable u : unsigned(15 downto 0);
begin
r := new rom16_t(0 to l-1);
r.all := (others => (others => '0'));
fopen(f, fd, fn);
for i in 0 to l loop
exit when endfile(f);
assert i<l report "ROM contents overrun" severity warning;
fread(f, fd, u);
r.all(i) := std_logic_vector(u);
end loop;
fclose(f, fd);
return r.all;
end fread_bin;
impure function fread_bin(fn: string; l: positive) return rom32_t is
file f : byte_f;
variable fd: rawfile;
variable r : rom32_p;
variable u : unsigned(31 downto 0);
begin
r := new rom32_t(0 to l-1);
r.all := (others => (others => '0'));
fopen(f, fd, fn);
for i in 0 to l loop
exit when endfile(f);
assert i<l report "ROM contents overrun" severity warning;
fread(f, fd, u);
r.all(i) := std_logic_vector(u);
end loop;
fclose(f, fd);
return r.all;
end fread_bin;
impure function fread_elf(fn: string; l: positive) return rom8_t is
file f : byte_f;
variable fd : rawfile;
variable r : rom8_p;
variable v : natural;
variable u : unsigned(31 downto 0);
variable u8 : unsigned( 7 downto 0);
variable e_phoff : natural;
variable e_phsize : natural;
variable e_phnum : natural;
variable p_offset : natural;
variable p_paddr : natural;
variable p_filesz : natural;
begin
r := new rom8_t(0 to l-1);
r.all := (others => (others => '0'));
fopen(f, fd, fn);
fread(f, fd, u);
assert u=elf32_magic report "Not an ELF file" severity failure;
fseek(f, fd, elf32_hdr_off);
fread(f, fd, u);
assert u=elf32_type_mach report "ELF for unknown machine" severity warning;
fread(f, fd, v); -- ELF file version
fread(f, fd, u);
fread(f, fd, e_phoff); report "offset phdr: " & natural'image(e_phoff);
fseek(f, fd, elf32_phentsize_off);
fread(f, fd, e_phsize, 16); report "phdr size: " & natural'image(e_phsize);
fread(f, fd, e_phnum, 16); report "num segments: " & natural'image(e_phnum);
for i in 1 to e_phnum loop
fseek(f, fd, e_phoff + e_phsize*(i-1));
fread(f, fd, u);
if u = elf32_pt_load then
fread(f, fd, p_offset);
fread(f, fd, v); -- p_vaddr
assert v=0 report "Virtual segment addr " & natural'image(v) severity warning;
fread(f, fd, p_paddr);
fread(f, fd, p_filesz);
assert p_filesz < l report "ROM contents overrun" severity failure;
report "-LOAD segment addr " & natural'image(p_paddr) & " @offset " & natural'image(p_offset) & " size " & natural'image(p_filesz);
fseek(f, fd, p_offset);
for j in 0 to p_filesz-1 loop
fread(f, fd, u8);
r.all(j+p_paddr) := std_logic_vector(u8);
end loop;
else
-- report "-Segment type " & hex(u);
end if;
end loop;
fclose(f, fd);
return r.all;
end fread_elf;
impure function fread_elf(fn: string; l: positive) return rom16_t is
file f : byte_f;
variable fd : rawfile;
variable r : rom16_p;
variable v : natural;
variable u : unsigned(31 downto 0);
variable u16: unsigned(15 downto 0);
variable e_phoff : natural;
variable e_phsize : natural;
variable e_phnum : natural;
variable p_offset : natural;
variable p_paddr : natural;
variable p_filesz : natural;
begin
r := new rom16_t(0 to l-1);
r.all := (others => (others => '0'));
fopen(f, fd, fn);
fread(f, fd, u);
assert u=elf32_magic report "Not an ELF file" severity failure;
fseek(f, fd, elf32_hdr_off);
fread(f, fd, u);
assert u=elf32_type_mach report "ELF for unknown machine" severity warning;
fread(f, fd, v); -- ELF file version
fread(f, fd, u);
fread(f, fd, e_phoff); report "offset phdr: " & natural'image(e_phoff);
fseek(f, fd, elf32_phentsize_off);
fread(f, fd, e_phsize, 16); report "phdr size: " & natural'image(e_phsize);
fread(f, fd, e_phnum, 16); report "num segments: " & natural'image(e_phnum);
for i in 1 to e_phnum loop
fseek(f, fd, e_phoff + e_phsize*(i-1));
fread(f, fd, u);
if u = elf32_pt_load then
fread(f, fd, p_offset);
fread(f, fd, v); -- p_vaddr
assert v=0 report "Virtual segment addr " & natural'image(v) severity warning;
fread(f, fd, p_paddr);
fread(f, fd, p_filesz);
assert p_filesz < l*2 report "ROM contents overrun" severity failure;
report "-LOAD segment addr " & natural'image(p_paddr) & " @offset " & natural'image(p_offset) & " size " & natural'image(p_filesz);
fseek(f, fd, p_offset);
for j in 0 to (p_filesz+1)/2-1 loop
fread(f, fd, u16);
r.all(j+p_paddr/2) := std_logic_vector(u16);
end loop;
else
-- report "-Segment type " & hex(u);
end if;
end loop;
fclose(f, fd);
return r.all;
end fread_elf;
impure function fread_elf(fn: string; l: positive) return rom32_t is
file f : byte_f;
variable fd : rawfile;
variable r : rom32_p;
variable v : natural;
variable u : unsigned(31 downto 0);
variable u32: unsigned(31 downto 0);
variable e_phoff : natural;
variable e_phsize : natural;
variable e_phnum : natural;
variable p_offset : natural;
variable p_paddr : natural;
variable p_filesz : natural;
begin
r := new rom32_t(0 to l-1);
r.all := (others => (others => '0'));
fopen(f, fd, fn);
fread(f, fd, u);
assert u=elf32_magic report "Not an ELF file" severity failure;
fseek(f, fd, elf32_hdr_off);
fread(f, fd, u);
assert u=elf32_type_mach report "ELF for unknown machine" severity warning;
fread(f, fd, v); -- ELF file version
fread(f, fd, u);
fread(f, fd, e_phoff); report "offset phdr: " & natural'image(e_phoff);
fseek(f, fd, elf32_phentsize_off);
fread(f, fd, e_phsize, 16); report "phdr size: " & natural'image(e_phsize);
fread(f, fd, e_phnum, 16); report "num segments: " & natural'image(e_phnum);
for i in 1 to e_phnum loop
fseek(f, fd, e_phoff + e_phsize*(i-1));
fread(f, fd, u);
if u = elf32_pt_load then
fread(f, fd, p_offset);
fread(f, fd, v); -- p_vaddr
assert v=0 report "Virtual segment addr " & natural'image(v) severity warning;
fread(f, fd, p_paddr);
fread(f, fd, p_filesz);
assert p_filesz < l*4 report "ROM contents overrun" severity failure;
report "-LOAD segment addr " & natural'image(p_paddr) & " @offset " & natural'image(p_offset) & " size " & natural'image(p_filesz);
fseek(f, fd, p_offset);
for j in 0 to (p_filesz+3)/4-1 loop
fread(f, fd, u32);
r.all(j+p_paddr/4) := std_logic_vector(u32);
end loop;
else
-- report "-Segment type " & hex(u);
end if;
end loop;
fclose(f, fd);
return r.all;
end fread_elf;
end rawfile_pack;
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