The CGEN support code in opcodes accesses instruction contents using a
couple of functions defined in cgen-opc.c: cgen_get_insn_value and
cgen_put_insn_value. These functions use the "instruction endianness"
in the CPU description to order the read/written bytes.
The process of writing an instruction to the object file is:
a) cgen_put_insn_value ;; Writes out the opcodes.
b) ARCH_cgen_insert_operand
insert_normal
insert_1
cgen_put_insn_value ;; Writes out the bytes of the
;; operand.
Likewise, the process of reading an instruction from the object file
is:
a) cgen_get_insn_value ;; Reads the opcodes.
b) ARCH_cgen_extract_operand
extract_normal
extract_1
cgen_get_insn_value ;; Reads in the bytes of the
;; operand.
As can be seen above, cgen_{get,put}_insn_value are used to both
process the instruction opcodes (the constant fields conforming the
base instruction) and also the values of the instruction operands,
such as immediates.
This is problematic for architectures in which the endianness of
instructions is different to the endianness of data. An example is
BPF, where instructions are always encoded big-endian but the data may
be either big or little.
This patch changes the cgen_{get,put}_insn_value functions in order to
get an extra argument with the endianness to use, and adapts the
existin callers to these functions in order to provide cd->endian or
cd->insn_endian, whatever appropriate. Callers like extract_1 and
insert_1 pass cd->endian (since they are reading/writing operand
values) while callers reading/writing the base instruction pass
cd->insn_endian instead.
A few little adjustments have been needed in some existing CGEN based
ports:
* The BPF assembler uses cgen_put_insn_value. It has been adapted to
pass the new endian argument.
* The mep port has code in mep.opc that uses cgen_{get,put}_insn_value.
It has been adapted to pass the new endianargument. Ditto for a
call in the assembler.
Tested with --enable-targets=all.
Regested in all supported targets.
No regressions.
include/ChangeLog:
2020-06-04 Jose E. Marchesi <jose.marchesi@oracle.com>
* opcode/cgen.h: Get an `endian' argument in both
cgen_get_insn_value and cgen_put_insn_value.
opcodes/ChangeLog:
2020-06-04 Jose E. Marchesi <jose.marchesi@oracle.com>
* cgen-opc.c (cgen_get_insn_value): Get an `endian' argument.
(cgen_put_insn_value): Likewise.
(cgen_lookup_insn): Pass endianness to cgen_{get,put}_insn_value.
* cgen-dis.in (print_insn): Likewise.
* cgen-ibld.in (insert_1): Likewise.
(insert_1): Likewise.
(insert_insn_normal): Likewise.
(extract_1): Likewise.
* bpf-dis.c: Regenerate.
* bpf-ibld.c: Likewise.
* bpf-ibld.c: Likewise.
* cgen-dis.in: Likewise.
* cgen-ibld.in: Likewise.
* cgen-opc.c: Likewise.
* epiphany-dis.c: Likewise.
* epiphany-ibld.c: Likewise.
* fr30-dis.c: Likewise.
* fr30-ibld.c: Likewise.
* frv-dis.c: Likewise.
* frv-ibld.c: Likewise.
* ip2k-dis.c: Likewise.
* ip2k-ibld.c: Likewise.
* iq2000-dis.c: Likewise.
* iq2000-ibld.c: Likewise.
* lm32-dis.c: Likewise.
* lm32-ibld.c: Likewise.
* m32c-dis.c: Likewise.
* m32c-ibld.c: Likewise.
* m32r-dis.c: Likewise.
* m32r-ibld.c: Likewise.
* mep-dis.c: Likewise.
* mep-ibld.c: Likewise.
* mt-dis.c: Likewise.
* mt-ibld.c: Likewise.
* or1k-dis.c: Likewise.
* or1k-ibld.c: Likewise.
* xc16x-dis.c: Likewise.
* xc16x-ibld.c: Likewise.
* xstormy16-dis.c: Likewise.
* xstormy16-ibld.c: Likewise.
gas/ChangeLog:
2020-06-04 Jose E. Marchesi <jose.marchesi@oracle.com>
* cgen.c (gas_cgen_finish_insn): Pass the endianness to
cgen_put_insn_value.
(gas_cgen_md_apply_fix): Likewise.
(gas_cgen_md_apply_fix): Likewise.
* config/tc-bpf.c (md_apply_fix): Pass data endianness to
cgen_put_insn_value.
* config/tc-mep.c (mep_check_ivc2_scheduling): Pass endianness to
cgen_put_insn_value.
cpu/ChangeLog:
2020-06-02 Jose E. Marchesi <jose.marchesi@oracle.com>
* mep.opc (print_slot_insn): Pass the insn endianness to
cgen_get_insn_value.
* cgen-opc.c (cgen_lookup_insn): Delete buf and base_insn temps.
Use insn_bytes_value and insn_int_value directly instead. Don't
free allocated memory until function exit.
* vms-hdr.c: Don't include alloca.h.
opcodes/
* cgen-opc.c: Include alloca-conf.h rather than alloca.h.
* Makefile.am: Run "make dep-am".
* Makefile.in: Regenerate.
* All CGEN-generated sources: Regenerate.
Contribute the following changes:
2005-09-19 Dave Brolley <brolley@redhat.com>
* disassemble.c (disassemble_init_for_target): Add 'break' to case for
bfd_arch_tic4x. Use cgen_bitset_create and cgen_bitset_set for
bfd_arch_m32c case.
2005-02-16 Dave Brolley <brolley@redhat.com>
* cgen-dis.in: Rename CGEN_ISA_MASK to CGEN_BITSET. Rename
cgen_isa_mask_* to cgen_bitset_*.
* cgen-opc.c: Likewise.
2003-11-28 Richard Sandiford <rsandifo@redhat.com>
* cgen-dis.in (print_insn_@arch@): Fix comparison with cached isas.
* *-dis.c: Regenerate.
2003-06-05 DJ Delorie <dj@redhat.com>
* cgen-dis.in (print_insn_@arch@): Copy prev_isas, don't assign
it, as it may point to a reused buffer. Set prev_isas when we
change cpus.
2002-12-13 Dave Brolley <brolley@redhat.com>
* cgen-opc.c (cgen_isa_mask_create): New support function for
CGEN_ISA_MASK.
(cgen_isa_mask_init): Ditto.
(cgen_isa_mask_clear): Ditto.
(cgen_isa_mask_add): Ditto.
(cgen_isa_mask_set): Ditto.
(cgen_isa_supported): Ditto.
(cgen_isa_mask_compare): Ditto.
(cgen_isa_mask_intersection): Ditto.
(cgen_isa_mask_copy): Ditto.
(cgen_isa_mask_combine): Ditto.
* cgen-dis.in (libiberty.h): #include it.
(isas): Renamed from 'isa' and now (CGEN_ISA_MASK *).
(print_insn_@arch@): Use CGEN_ISA_MASK and support functions.
* Makefile.am (CGENDEPS): Add utils-cgen.scm and attrs.scm.
* Makefile.in: Regenerated.
2001-06-13 Geoffrey Keating <geoffk@redhat.com>
* cgen-asm.c (cgen_parse_keyword): When looking for the
boundaries of a keyword, allow any special characters
that are actually in one of the allowed keyword.
* cgen-opc.c (cgen_keyword_add): Add any special characters
to the nonalpha_chars field.
Index: cgen/ChangeLog
2001-06-13 Geoffrey Keating <geoffk@redhat.com>
* desc.scm (<keyword> 'gen-defn): Add extra zero into
CGEN_KEYWORD_ENTRY initializers.
Index: include/opcode/ChangeLog
2001-06-13 Geoffrey Keating <geoffk@redhat.com>
* cgen.h (cgen_keyword): Add nonalpha_chars field.
2001-01-02 Richard Sandiford <rsandifo@redhat.com>
* cgen-dis.c (hash_insn_array): Use bfd_put_bits().
(hash_insn_list): Likewise
* cgen-ibld.in (insert_1): Use bfd_put_bits() and bfd_get_bits().
(extract_1): Use bfd_get_bits().
(extract_normal): Apply sign extension to both extraction
methods.
* cgen-opc.c (cgen_get_insn_value): Use bfd_get_bits()
(cgen_put_insn_value): Use bfd_put_bits()
Jose E. Marchesi
Alan Modra
Nick Clifton
H.J. Lu
Dave Brolley
Michael Meissner
Frank Ch. Eigler
Geoffrey Keating
Greg McGary
Richard Henderson