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      1 #	$NetBSD: README,v 1.6 2023/05/14 16:13:05 phx Exp $
      2 
      3 BUILD INSTRUCTIONS
      4 
      5 Building LoadBSD isn't easy since several sources from the NetBSD repository
      6 are required. Compiling these sources under AmigaOS without clashes with the
      7 native GCC headers requires some knowledge. This document tries to describe
      8 the steps necessary to rebuild LoadBSD with a modern AmigaOS gcc, or vbcc
      9 with PosixLib.
     10 These instructions do only apply for LoadBSD versions using the loadfile()
     11 interface. Previous version do only require getopt.c and reboot.h.
     12 
     13 Note: It is not possible to build LoadBSD with the native NetBSD compiler!
     14       LoadBSD is an *AmigaOS* program and must be built with an AmigaOS
     15       compiler. Of course, a properly setup cross-compiler does work.
     16 
     17 Required sources from NetBSD (either HEAD or from a release branch)
     18 
     19    From src/sys/lib/libsa: loadfile.h,loadfile.c,loadfile_elf32.c,loadfile_aout.c
     20 
     21       place these files in the directory where you have loadbsd.c
     22 
     23    From src/sys/arch/m68k/include: aout_machdep.h,elf_machdep.h
     24 
     25       place these files in: <loadbsd directory>/include/m68k
     26 
     27    From src/sys/arch/amiga/include: aout_machdep.h,elf_machdep.h,loadfile_machdep.h
     28 
     29       place these files in: <loadbsd directory>/include/machine
     30 
     31    From src/sys/sys: exec.h,exec_elf.h,exec_aout.h,aout_mids.h,reboot.h
     32 
     33       place these files in: <loadbsd directory>/include/sys
     34 
     35    Additional headers (see below): inttypes.h,namespace.h,lib/libsa/stand.h,lib/libkern/libkern.h
     36 
     37       place these files in: <loadbsd directory>/include
     38 
     39 If all the mentioned files are placed at the correct place, loadfile_machdep.h
     40 must be modified. The patch is included below. Another small patch to
     41 loadfile_aout.c must be applied to fix an incompatibility for LoadBSD.
     42 However, that patch breaks loadfile() for other architectures using a.out!
     43 Note: This patch is required to be able to suppress loaded symbols when
     44       booting ancient a.out kernels that don't support them. Without the
     45       patch symbol suppressing doesn't work! That also means ELF isn't
     46       affected and LoadBSD could handle it differently but then it could
     47       probably break in other unpredictable ways...
     48 
     49 The headers inttypes.h, namespace.h, include/lib/libsa/stand.h and
     50 lib/libkern/libkern.h are listed completely below.
     51 
     52 Then it should be possible to recompile LoadBSD with gcc6 or newer by
     53 typing "make" (or "make -f vmakefile" with vbcc). If make fails, fix the
     54 problem and try again :-P
     55 
     56 Good luck!
     57 
     58 --- Missing files/patches ---
     59 
     60       include/machine/loadfile_machdep.h modification:
     61 --cut--
     62 --- include/machine/loadfile_machdep.h~     Sun Mar 26 15:46:55 2023
     63 +++ include/machine/loadfile_machdep.h  Sun Mar 26 15:47:17 2023
     64 @@ -38,7 +38,7 @@
     65  #define	LOAD_KERNEL		LOAD_ALL
     66  #define	COUNT_KERNEL		COUNT_ALL
     67  
     68 -#ifdef _STANDALONE
     69 +#if 0
     70  
     71  #define LOADADDR(a)		((a) + offset)
     72  #define ALIGNENTRY(a)		0
     73 --cut--
     74 
     75       loadfile_aout.c modification:
     76 --cut--
     77 --- loadfile_aout.c~	Mon Feb 11 21:25:56 2002
     78 +++ loadfile_aout.c	Thu Jan 23 10:43:27 2003
     79 @@ -217,8 +217,8 @@ loadfile_aout(fd, x, marks, flags)
     80  		BCOPY(&x->a_syms, maxp, sizeof(x->a_syms));
     81  
     82  	if (flags & (LOAD_SYM|COUNT_SYM)) {
     83 -		maxp += sizeof(x->a_syms);
     84  		aoutp = maxp;
     85 +		maxp += sizeof(x->a_syms);
     86  	}
     87  
     88  	if (x->a_syms > 0) {
     89 --cut--
     90 
     91       include/inttypes.h:
     92 --cut--
     93 #ifndef _INTTYPES_H
     94 #define _INTTYPES_H
     95 
     96 #include <sys/types.h>
     97 #include <sys/cdefs.h>
     98 
     99 #ifndef be32toh
    100 #define be32toh(x) (x)
    101 #endif
    102 
    103 #ifndef roundup
    104 #define roundup(x,y) ((((x)+((y)-1))/(y))*(y))
    105 #endif
    106 
    107 typedef unsigned long vaddr_t;
    108 typedef unsigned long paddr_t;
    109 
    110 #endif /* !_INTTYPES_H */
    111 --cut--
    112 
    113     include/namespace.h
    114 --cut--
    115 #define _DIAGASSERT(x) /**/
    116 
    117 extern char *program_name;
    118 #define getprogname() program_name
    119 
    120 #ifndef __UNCONST
    121 #define __UNCONST(a)   ((void *)(unsigned long)(const void *)(a))
    122 #endif
    123 --cut--
    124 
    125       include/lib/libsa/stand.h
    126 --cut--
    127 #include <stdio.h>
    128 #include <string.h>
    129 #include <errno.h>
    130 #include <stdlib.h>
    131 #include <unistd.h>
    132 #include <fcntl.h>
    133 #include "inttypes.h"
    134 --cut--
    135 
    136       include/lib/libkern/libkern.h
    137 --cut--
    138 /* nothing, must only exist! */
    139 --cut--
    140