powerpc: Make COFF zImages for old 32-bit powermacs

This adds code to build zImage.coff and/or zImage.initrd.coff when
CONFIG_PPC32 and CONFIG_PPC_PMAC are defined.  It also restructures
the OF client code and adds some workarounds for OF quirks on the
older machines.

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 243 insertions, 0 deletions

diff --git a/arch/powerpc/boot/rs6000.h b/arch/powerpc/boot/rs6000.h
new file mode 100644
index 000000000000..433f45084e41
--- /dev/null
+++ b/arch/powerpc/boot/rs6000.h
@@ -0,0 +1,243 @@
+/* IBM RS/6000 "XCOFF" file definitions for BFD.
+   Copyright (C) 1990, 1991 Free Software Foundation, Inc.
+   FIXME: Can someone provide a transliteration of this name into ASCII?
+   Using the following chars caused a compiler warning on HIUX (so I replaced
+   them with octal escapes), and isn't useful without an understanding of what
+   character set it is.
+   Written by Mimi Ph\373\364ng-Th\345o V\365 of IBM
+   and John Gilmore of Cygnus Support.  */
+
+/********************** FILE HEADER **********************/
+
+struct external_filehdr {
+        char f_magic[2];        /* magic number                 */
+        char f_nscns[2];        /* number of sections           */
+        char f_timdat[4];       /* time & date stamp            */
+        char f_symptr[4];       /* file pointer to symtab       */
+        char f_nsyms[4];        /* number of symtab entries     */
+        char f_opthdr[2];       /* sizeof(optional hdr)         */
+        char f_flags[2];        /* flags                        */
+};
+
+        /* IBM RS/6000 */
+#define U802WRMAGIC     0730    /* writeable text segments **chh**      */
+#define U802ROMAGIC     0735    /* readonly sharable text segments      */
+#define U802TOCMAGIC    0737    /* readonly text segments and TOC       */
+
+#define BADMAG(x)       \
+        ((x).f_magic != U802ROMAGIC && (x).f_magic != U802WRMAGIC && \
+         (x).f_magic != U802TOCMAGIC)
+
+#define FILHDR  struct external_filehdr
+#define FILHSZ  20
+
+
+/********************** AOUT "OPTIONAL HEADER" **********************/
+
+
+typedef struct
+{
+  unsigned char magic[2];       /* type of file                 */
+  unsigned char vstamp[2];      /* version stamp                */
+  unsigned char tsize[4];       /* text size in bytes, padded to FW bdry */
+  unsigned char dsize[4];       /* initialized data "  "        */
+  unsigned char bsize[4];       /* uninitialized data "   "     */
+  unsigned char entry[4];       /* entry pt.                    */
+  unsigned char text_start[4];  /* base of text used for this file */
+  unsigned char data_start[4];  /* base of data used for this file */
+  unsigned char o_toc[4];       /* address of TOC */
+  unsigned char o_snentry[2];   /* section number of entry point */
+  unsigned char o_sntext[2];    /* section number of .text section */
+  unsigned char o_sndata[2];    /* section number of .data section */
+  unsigned char o_sntoc[2];     /* section number of TOC */
+  unsigned char o_snloader[2];  /* section number of .loader section */
+  unsigned char o_snbss[2];     /* section number of .bss section */
+  unsigned char o_algntext[2];  /* .text alignment */
+  unsigned char o_algndata[2];  /* .data alignment */
+  unsigned char o_modtype[2];   /* module type (??) */
+  unsigned char o_cputype[2];   /* cpu type */
+  unsigned char o_maxstack[4];  /* max stack size (??) */
+  unsigned char o_maxdata[4];   /* max data size (??) */
+  unsigned char o_resv2[12];    /* reserved */
+}
+AOUTHDR;
+
+#define AOUTSZ 72
+#define SMALL_AOUTSZ (28)
+#define AOUTHDRSZ 72
+
+#define RS6K_AOUTHDR_OMAGIC     0x0107  /* old: text & data writeable */
+#define RS6K_AOUTHDR_NMAGIC     0x0108  /* new: text r/o, data r/w */
+#define RS6K_AOUTHDR_ZMAGIC     0x010B  /* paged: text r/o, both page-aligned */
+
+
+/********************** SECTION HEADER **********************/
+
+
+struct external_scnhdr {
+        char            s_name[8];      /* section name                 */
+        char            s_paddr[4];     /* physical address, aliased s_nlib */
+        char            s_vaddr[4];     /* virtual address              */
+        char            s_size[4];      /* section size                 */
+        char            s_scnptr[4];    /* file ptr to raw data for section */
+        char            s_relptr[4];    /* file ptr to relocation       */
+        char            s_lnnoptr[4];   /* file ptr to line numbers     */
+        char            s_nreloc[2];    /* number of relocation entries */
+        char            s_nlnno[2];     /* number of line number entries*/
+        char            s_flags[4];     /* flags                        */
+};
+
+/*
+ * names of "special" sections
+ */
+#define _TEXT   ".text"
+#define _DATA   ".data"
+#define _BSS    ".bss"
+#define _PAD    ".pad"
+#define _LOADER ".loader"
+
+#define SCNHDR  struct external_scnhdr
+#define SCNHSZ  40
+
+/* XCOFF uses a special .loader section with type STYP_LOADER.  */
+#define STYP_LOADER 0x1000
+
+/* XCOFF uses a special .debug section with type STYP_DEBUG.  */
+#define STYP_DEBUG 0x2000
+
+/* XCOFF handles line number or relocation overflow by creating
+   another section header with STYP_OVRFLO set.  */
+#define STYP_OVRFLO 0x8000
+
+/********************** LINE NUMBERS **********************/
+
+/* 1 line number entry for every "breakpointable" source line in a section.
+ * Line numbers are grouped on a per function basis; first entry in a function
+ * grouping will have l_lnno = 0 and in place of physical address will be the
+ * symbol table index of the function name.
+ */
+struct external_lineno {
+        union {
+                char l_symndx[4];       /* function name symbol index, iff l_lnno == 0*/
+                char l_paddr[4];        /* (physical) address of line number    */
+        } l_addr;
+        char l_lnno[2]; /* line number          */
+};
+
+
+#define LINENO  struct external_lineno
+#define LINESZ  6
+
+
+/********************** SYMBOLS **********************/
+
+#define E_SYMNMLEN      8       /* # characters in a symbol name        */
+#define E_FILNMLEN      14      /* # characters in a file name          */
+#define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
+
+struct external_syment
+{
+  union {
+    char e_name[E_SYMNMLEN];
+    struct {
+      char e_zeroes[4];
+      char e_offset[4];
+    } e;
+  } e;
+  char e_value[4];
+  char e_scnum[2];
+  char e_type[2];
+  char e_sclass[1];
+  char e_numaux[1];
+};
+
+
+
+#define N_BTMASK        (017)
+#define N_TMASK         (060)
+#define N_BTSHFT        (4)
+#define N_TSHIFT        (2)
+
+
+union external_auxent {
+        struct {
+                char x_tagndx[4];       /* str, un, or enum tag indx */
+                union {
+                        struct {
+                            char  x_lnno[2]; /* declaration line number */
+                            char  x_size[2]; /* str/union/array size */
+                        } x_lnsz;
+                        char x_fsize[4];        /* size of function */
+                } x_misc;
+                union {
+                        struct {                /* if ISFCN, tag, or .bb */
+                            char x_lnnoptr[4];  /* ptr to fcn line # */
+                            char x_endndx[4];   /* entry ndx past block end */
+                        } x_fcn;
+                        struct {                /* if ISARY, up to 4 dimen. */
+                            char x_dimen[E_DIMNUM][2];
+                        } x_ary;
+                } x_fcnary;
+                char x_tvndx[2];                /* tv index */
+        } x_sym;
+
+        union {
+                char x_fname[E_FILNMLEN];
+                struct {
+                        char x_zeroes[4];
+                        char x_offset[4];
+                } x_n;
+        } x_file;
+
+        struct {
+                char x_scnlen[4];                       /* section length */
+                char x_nreloc[2];       /* # relocation entries */
+                char x_nlinno[2];       /* # line numbers */
+        } x_scn;
+
+        struct {
+                char x_tvfill[4];       /* tv fill value */
+                char x_tvlen[2];        /* length of .tv */
+                char x_tvran[2][2];     /* tv range */
+        } x_tv;         /* info about .tv section (in auxent of symbol .tv)) */
+
+        struct {
+                unsigned char x_scnlen[4];
+                unsigned char x_parmhash[4];
+                unsigned char x_snhash[2];
+                unsigned char x_smtyp[1];
+                unsigned char x_smclas[1];
+                unsigned char x_stab[4];
+                unsigned char x_snstab[2];
+        } x_csect;
+
+};
+
+#define SYMENT  struct external_syment
+#define SYMESZ  18
+#define AUXENT  union external_auxent
+#define AUXESZ  18
+#define DBXMASK 0x80            /* for dbx storage mask */
+#define SYMNAME_IN_DEBUG(symptr) ((symptr)->n_sclass & DBXMASK)
+
+
+
+/********************** RELOCATION DIRECTIVES **********************/
+
+
+struct external_reloc {
+  char r_vaddr[4];
+  char r_symndx[4];
+  char r_size[1];
+  char r_type[1];
+};
+
+
+#define RELOC struct external_reloc
+#define RELSZ 10
+
+#define DEFAULT_DATA_SECTION_ALIGNMENT 4
+#define DEFAULT_BSS_SECTION_ALIGNMENT 4
+#define DEFAULT_TEXT_SECTION_ALIGNMENT 4
+/* For new sections we havn't heard of before */
+#define DEFAULT_SECTION_ALIGNMENT 4