diff options
Diffstat (limited to 'gas/doc/c-riscv.texi')
| -rw-r--r-- | gas/doc/c-riscv.texi | 160 |
1 files changed, 93 insertions, 67 deletions
diff --git a/gas/doc/c-riscv.texi b/gas/doc/c-riscv.texi index e945482..c15297e 100644 --- a/gas/doc/c-riscv.texi +++ b/gas/doc/c-riscv.texi @@ -363,7 +363,7 @@ The pseudo la.tls.gd instruction can be expended to @cindex instruction formats, risc-v @cindex RISC-V instruction formats -The RISC-V Instruction Set Manual Volume I: User-Level ISA lists 12 +The RISC-V Instruction Set Manual Volume I: User-Level ISA lists 15 instruction formats where some of the formats have multiple variants. For the @samp{.insn} pseudo directive the assembler recognizes some of the formats. @@ -394,6 +394,8 @@ only accept s0-s1, a0-a5, fs0-fs1 and fa0-fa5. @item simm12 @tab Sign-extended 12-bit immediate for operand x. @item simm20 @tab Sign-extended 20-bit immediate for operand x. @item simm6 @tab Sign-extended 6-bit immediate for operand x. +@item uimm5 @tab Unsigned 5-bit immediate for operand x. +@item uimm6 @tab Unsigned 6-bit immediate for operand x. @item uimm8 @tab Unsigned 8-bit immediate for operand x. @item symbol @tab Symbol or lable reference for operand x. @end multitable @@ -487,112 +489,136 @@ The following table lists the RISC-V instruction formats that are available with the @samp{.insn} pseudo directive: @table @code -@item R type: .insn r opcode, func3, func7, rd, rs1, rs2 +@item R type: .insn r opcode6, func3, func7, rd, rs1, rs2 @verbatim -+-------+-----+-----+-------+----+-------------+ -| func7 | rs2 | rs1 | func3 | rd | opcode | -+-------+-----+-----+-------+----+-------------+ -31 25 20 15 12 7 0 ++-------+-----+-----+-------+----+---------+ +| func7 | rs2 | rs1 | func3 | rd | opcode6 | ++-------+-----+-----+-------+----+---------+ +31 25 20 15 12 7 0 @end verbatim -@item R type with 4 register operands: .insn r opcode, func3, func2, rd, rs1, rs2, rs3 -@itemx R4 type: .insn r4 opcode, func3, func2, rd, rs1, rs2, rs3 +@item R type with 4 register operands: .insn r opcode6, func3, func2, rd, rs1, rs2, rs3 +@itemx R4 type: .insn r4 opcode6, func3, func2, rd, rs1, rs2, rs3 @verbatim -+-----+-------+-----+-----+-------+----+-------------+ -| rs3 | func2 | rs2 | rs1 | func3 | rd | opcode | -+-----+-------+-----+-----+-------+----+-------------+ -31 27 25 20 15 12 7 0 ++-----+-------+-----+-----+-------+----+---------+ +| rs3 | func2 | rs2 | rs1 | func3 | rd | opcode6 | ++-----+-------+-----+-----+-------+----+---------+ +31 27 25 20 15 12 7 0 @end verbatim -@item I type: .insn i opcode, func3, rd, rs1, simm12 -@itemx I type: .insn i opcode, func3, rd, simm12(rs1) +@item I type: .insn i opcode6, func3, rd, rs1, simm12 +@itemx I type: .insn i opcode6, func3, rd, simm12(rs1) @verbatim -+-------------+-----+-------+----+-------------+ -| simm12 | rs1 | func3 | rd | opcode | -+-------------+-----+-------+----+-------------+ -31 20 15 12 7 0 ++--------------+-----+-------+----+---------+ +| simm12[11:0] | rs1 | func3 | rd | opcode6 | ++--------------+-----+-------+----+---------+ +31 20 15 12 7 0 @end verbatim -@item S type: .insn s opcode, func3, rs2, simm12(rs1) +@item S type: .insn s opcode6, func3, rs2, simm12(rs1) @verbatim -+--------------+-----+-----+-------+-------------+-------------+ -| simm12[11:5] | rs2 | rs1 | func3 | simm12[4:0] | opcode | -+--------------+-----+-----+-------+-------------+-------------+ -31 25 20 15 12 7 0 ++--------------+-----+-----+-------+-------------+---------+ +| simm12[11:5] | rs2 | rs1 | func3 | simm12[4:0] | opcode6 | ++--------------+-----+-----+-------+-------------+---------+ +31 25 20 15 12 7 0 @end verbatim -@item B type: .insn s opcode, func3, rs1, rs2, symbol -@itemx SB type: .insn sb opcode, func3, rs1, rs2, symbol +@item B type: .insn s opcode6, func3, rs1, rs2, symbol +@itemx SB type: .insn sb opcode6, func3, rs1, rs2, symbol @verbatim -+------------+--------------+-----+-----+-------+-------------+-------------+--------+ -| simm12[12] | simm12[10:5] | rs2 | rs1 | func3 | simm12[4:1] | simm12[11]] | opcode | -+------------+--------------+-----+-----+-------+-------------+-------------+--------+ -31 30 25 20 15 12 7 0 ++-----------------+-----+-----+-------+----------------+---------+ +| simm12[12|10:5] | rs2 | rs1 | func3 | simm12[4:1|11] | opcode6 | ++-----------------+-----+-----+-------+----------------+---------+ +31 25 20 15 12 7 0 @end verbatim -@item U type: .insn u opcode, rd, simm20 +@item U type: .insn u opcode6, rd, simm20 @verbatim -+---------------------------+----+-------------+ -| simm20 | rd | opcode | -+---------------------------+----+-------------+ -31 12 7 0 ++--------------------------+----+---------+ +| simm20[20|10:1|11|19:12] | rd | opcode6 | ++--------------------------+----+---------+ +31 12 7 0 @end verbatim -@item J type: .insn j opcode, rd, symbol -@itemx UJ type: .insn uj opcode, rd, symbol +@item J type: .insn j opcode6, rd, symbol +@itemx UJ type: .insn uj opcode6, rd, symbol @verbatim -+------------+--------------+------------+---------------+----+-------------+ -| simm20[20] | simm20[10:1] | simm20[11] | simm20[19:12] | rd | opcode | -+------------+--------------+------------+---------------+----+-------------+ -31 30 21 20 12 7 0 ++------------+--------------+------------+---------------+----+---------+ +| simm20[20] | simm20[10:1] | simm20[11] | simm20[19:12] | rd | opcode6 | ++------------+--------------+------------+---------------+----+---------+ +31 30 21 20 12 7 0 @end verbatim @item CR type: .insn cr opcode2, func4, rd, rs2 @verbatim -+---------+--------+-----+---------+ -| func4 | rd/rs1 | rs2 | opcode2 | -+---------+--------+-----+---------+ -15 12 7 2 0 ++-------+--------+-----+---------+ +| func4 | rd/rs1 | rs2 | opcode2 | ++-------+--------+-----+---------+ +15 12 7 2 0 @end verbatim @item CI type: .insn ci opcode2, func3, rd, simm6 @verbatim -+---------+-----+--------+-----+---------+ -| func3 | imm | rd/rs1 | imm | opcode2 | -+---------+-----+--------+-----+---------+ -15 13 12 7 2 0 ++-------+----------+--------+------------+---------+ +| func3 | simm6[5] | rd/rs1 | simm6[4:0] | opcode2 | ++-------+----------+--------+------------+---------+ +15 13 12 7 2 0 @end verbatim -@item CIW type: .insn ciw opcode2, func3, rd, uimm8 +@item CIW type: .insn ciw opcode2, func3, rd', uimm8 @verbatim -+---------+--------------+-----+---------+ -| func3 | imm | rd' | opcode2 | -+---------+--------------+-----+---------+ -15 13 7 2 0 ++-------+------------+-----+---------+ +| func3 | uimm8[7:0] | rd' | opcode2 | ++-------+-------- ---+-----+---------+ +15 13 5 2 0 @end verbatim -@item CA type: .insn ca opcode2, func6, func2, rd, rs2 +@item CSS type: .insn css opcode2, func3, rd, uimm6 @verbatim -+---------+----------+-------+------+--------+ -| func6 | rd'/rs1' | func2 | rs2' | opcode | -+---------+----------+-------+------+--------+ -15 10 7 5 2 0 ++-------+------------+----+---------+ +| func3 | uimm6[5:0] | rd | opcode2 | ++-------+------------+----+---------+ +15 13 7 2 0 @end verbatim -@item CB type: .insn cb opcode2, func3, rs1, symbol +@item CL type: .insn cl opcode2, func3, rd', uimm5(rs1') @verbatim -+---------+--------+------+--------+---------+ -| func3 | offset | rs1' | offset | opcode2 | -+---------+--------+------+--------+---------+ -15 13 10 7 2 0 ++-------+------------+------+------------+------+---------+ +| func3 | uimm5[4:2] | rs1' | uimm5[1:0] | rd' | opcode2 | ++-------+------------+------+------------+------+---------+ +15 13 10 7 5 2 0 +@end verbatim + +@item CS type: .insn cs opcode2, func3, rs2', uimm5(rs1') +@verbatim ++-------+------------+------+------------+------+---------+ +| func3 | uimm5[4:2] | rs1' | uimm5[1:0] | rs2' | opcode2 | ++-------+------------+------+------------+------+---------+ +15 13 10 7 5 2 0 +@end verbatim + +@item CA type: .insn ca opcode2, func6, func2, rd', rs2' +@verbatim ++-- ----+----------+-------+------+---------+ +| func6 | rd'/rs1' | func2 | rs2' | opcode2 | ++-------+----------+-------+------+---------+ +15 10 7 5 2 0 +@end verbatim + +@item CB type: .insn cb opcode2, func3, rs1', symbol +@verbatim ++-------+--------------+------+------------------+---------+ +| func3 | simm8[8|4:3] | rs1' | simm8[7:6|2:1|5] | opcode2 | ++-------+--------------+------+------------------+---------+ +15 13 10 7 2 0 @end verbatim @item CJ type: .insn cj opcode2, symbol @verbatim -+---------+--------------------+---------+ -| func3 | jump target | opcode2 | -+---------+--------------------+---------+ -15 13 7 2 0 ++-------+-------------------------------+---------+ +| func3 | simm11[11|4|9:8|10|6|7|3:1|5] | opcode2 | ++-------+-------------------------------+---------+ +15 13 2 0 @end verbatim |