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Maciej W. Rozycki b2805ed554 MIPS16: Remove "extended" BREAK/SDBBP handling
Remove special casing for the `6' operand code used for the embedded
trap code of the BREAK and the SDBBP instructions to support supposedly
extended forms of these instructions.

According to all versions of the MIPS16 ASE specifications these
instructions are not extensible [1][2][3][4][5][7][8][10][11], and as
from revision 2.50 of the MIPS16e ASE specifications it has been further
clarified what was previously implied, that non-extesiable instructions
when preceded with an EXTEND prefix must cause a Reserved Instruction
exception [5][6][9][10].

Therefore supposedly extended BREAK and SDBBP instructions do not serve
their purpose anymore as they do not cause a Bp and a Debug exception
respectively and supporting these forms in disassembly only causes
confusion.

References:

[1] "Product Description, MIPS16 Application-Specific Extension",
    Version 1.3, MIPS Technologies, Inc., 970130, Table 3. "MIPS16
    Instruction Set Summary", p. 5

[2] same, Table 5 "RR Minor Opcodes (RR-type instructions)", p.10

[3] same, Table 18. "Extendable MIPS16 Instructions", p. 24

[4] "MIPS32 Architecture for Programmers, Volume IV-a: The MIPS16e
    Application-Specific Extension to the MIPS32 Architecture", MIPS
    Technologies, Inc., Document Number: MD00076, Revision 2.63, July
    16, 2013, Table 3.8 "MIPS16e Special Instructions", p. 38

[5] same, Section 3.11 "MIPS16e Extensible Instructions, p. 41

[6] same, Table 3.15 "MIPS16e Extensible Instructions", p. 41

[7] same, Table 3.24 "MIPS16e RR Encoding of the Funct Field", p. 49

[8] "MIPS64 Architecture for Programmers, Volume IV-a: The MIPS16e
    Application-Specific Extension to the MIPS64 Architecture", MIPS
    Technologies, Inc., Document Number: MD00077, Revision 2.60, June
    25, 2008, Table 1.8 "MIPS16e Special Instructions", p. 39

[9] same, Section 1.11 "MIPS16e Extensible Instructions", p. 42

[10] same, Table 1.15 "MIPS16e Extensible Instructions", pp. 42-43

[11] same, Table 1.24 "MIPS16e RR Encoding of the Funct Field", p. 50

	gas/
	* config/tc-mips.c (match_mips16_insn): Remove the `6' operand
	code special case and its associated comment.

	opcodes/
	* mips16-opc.c (decode_mips16_operand) <'6'>: Remove extended
	encoding support.
2016-12-23 19:30:39 +00:00
bfd Call target specific add_symbols function 2016-12-24 00:20:03 +10:30
binutils Bump version to 2.28.51 2016-12-23 09:50:53 +01:00
config
cpu
elfcpp
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gas MIPS16: Remove "extended" BREAK/SDBBP handling 2016-12-23 19:30:39 +00:00
gdb Fix more cases of improper test names 2016-12-23 10:52:18 -06:00
gold Bump gold version number to 1.14. 2016-12-23 08:00:13 -08:00
gprof Bump version to 2.28.51 2016-12-23 09:50:53 +01:00
include Remove high bit set characters 2016-12-21 19:18:46 +10:30
intl
ld Bump version to 2.28.51 2016-12-23 09:50:53 +01:00
libdecnumber
libiberty
opcodes MIPS16: Remove "extended" BREAK/SDBBP handling 2016-12-23 19:30:39 +00:00
readline
sim Fix bugs with float compare and Inf operands. 2016-12-21 12:33:12 -08:00
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