1bf58cf51c
The new relocation type RELOLIS handles these instructions:
lis RT, ha16[expr] == addis RT, r0, ha16[expr]
lis RT, hi16[expr] == addis RT, r0, hi16[expr]
RELOLIS stores a 32-bit value in the program text. In this value, the
high bit is a ha16 flag, the next 5 bits are the target register RT,
and the low bits are a signed 26-bit offset. The linker replaces this
value with the lis instruction.
The old RELOPPC relocated a ha16/lo16 or hi16/lo16 pair. The new
RELOLIS relocates only a ha16 or hi16, so it is no longer necessary to
have a matching lo16 in the next instruction. The disadvantage is
that RELOLIS has only a signed 26-bit offset, not a 32-bit offset.
Switch the assembler to use RELOLIS for ha16 or hi16 and RELO2 for
lo16. The li32 instruction still uses the old RELOPPC relocation.
This is not the same as my RELOPPC change from my recent mail to
tack-devel (https://sourceforge.net/p/tack/mailman/message/35651528/).
This commit is on a different branch. Here I am throwing away my
RELOPPC change and instead trying RELOLIS.
125 lines
3.7 KiB
C
125 lines
3.7 KiB
C
/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Id$ */
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#ifndef __OUT_H_INCLUDED
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#define __OUT_H_INCLUDED
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#include <stdint.h>
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/*
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* output format for ACK assemblers
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*/
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struct outhead {
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uint16_t oh_magic; /* magic number */
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uint16_t oh_stamp; /* version stamp */
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uint16_t oh_flags; /* several format flags */
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uint16_t oh_nsect; /* number of outsect structures */
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uint16_t oh_nrelo; /* number of outrelo structures */
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uint16_t oh_nname; /* number of outname structures */
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uint32_t oh_nemit; /* sum of all os_flen */
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uint32_t oh_nchar; /* size of string area */
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};
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#define O_MAGIC 0x0202 /* magic number of output file */
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#define O_STAMP 0 /* version stamp */
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#define MAXSECT 64 /* Maximum number of sections */
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#define HF_LINK 0x0004 /* unresolved references left */
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#define HF_8086 0x0008 /* os_base specially encoded */
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struct outsect {
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uint32_t os_base; /* startaddress in machine */
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uint32_t os_size; /* section size in machine */
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uint32_t os_foff; /* startaddress in file */
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uint32_t os_flen; /* section size in file */
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uint32_t os_lign; /* section alignment */
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};
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struct outrelo {
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uint16_t or_type; /* type of reference */
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uint16_t or_sect; /* referencing section */
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uint16_t or_nami; /* referenced symbol index */
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uint32_t or_addr; /* referencing address */
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};
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struct outname {
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union {
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char *on_ptr; /* symbol name (in core) */
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long on_off; /* symbol name (in file) */
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} on_u;
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#define on_mptr on_u.on_ptr
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#define on_foff on_u.on_off
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uint16_t on_type; /* symbol type */
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uint16_t on_desc; /* debug info */
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uint32_t on_valu; /* symbol value */
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};
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/*
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* relocation type bits
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*/
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#define RELSZ 0x0fff /* relocation length */
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#define RELO1 1 /* 1 byte */
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#define RELO2 2 /* 2 bytes */
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#define RELO4 3 /* 4 bytes */
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#define RELOPPC 4 /* PowerPC 26-bit address */
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#define RELOLIS 5 /* PowerPC lis */
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#define RELOVC4 6 /* VideoCore IV address in 32-bit instruction */
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#define RELPC 0x2000 /* pc relative */
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#define RELBR 0x4000 /* High order byte lowest address. */
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#define RELWR 0x8000 /* High order word lowest address. */
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/*
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* section type bits and fields
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*/
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#define S_TYP 0x007F /* undefined, absolute or relative */
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#define S_EXT 0x0080 /* external flag */
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#define S_ETC 0x7F00 /* for symbolic debug, bypassing 'as' */
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/*
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* S_TYP field values
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*/
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#define S_UND 0x0000 /* undefined item */
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#define S_ABS 0x0001 /* absolute item */
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#define S_MIN 0x0002 /* first user section */
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#define S_MAX (S_TYP-1) /* last user section */
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#define S_CRS S_TYP /* on_valu is symbol index which contains value */
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/*
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* S_ETC field values
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*/
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#define S_SCT 0x0100 /* section names */
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#define S_LIN 0x0200 /* hll source line item */
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#define S_FIL 0x0300 /* hll source file item */
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#define S_MOD 0x0400 /* ass source file item */
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#define S_COM 0x1000 /* Common name. */
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#define S_STB 0xe000 /* entries with any of these bits set are
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reserved for debuggers
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*/
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/*
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* structure sizes on disk (bytes in file; add digits in SF_*)
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* Note! These are NOT the sizes in memory (64-bit architectures will have
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* a different layout).
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*/
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#define SZ_HEAD 20
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#define SZ_SECT 20
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#define SZ_RELO 10
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#define SZ_NAME 12
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/*
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* file access macros
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*/
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#define BADMAGIC(x) ((x).oh_magic!=O_MAGIC)
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#define OFF_SECT(x) SZ_HEAD
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#define OFF_EMIT(x) (OFF_SECT(x) + ((long)(x).oh_nsect * SZ_SECT))
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#define OFF_RELO(x) (OFF_EMIT(x) + (x).oh_nemit)
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#define OFF_NAME(x) (OFF_RELO(x) + ((long)(x).oh_nrelo * SZ_RELO))
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#define OFF_CHAR(x) (OFF_NAME(x) + ((long)(x).oh_nname * SZ_NAME))
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#endif /* __OUT_H_INCLUDED */
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