diff options
Diffstat (limited to 'opcodes/mips16-opc.c')
| -rw-r--r-- | opcodes/mips16-opc.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/opcodes/mips16-opc.c b/opcodes/mips16-opc.c index 1e03402..62d3e7f 100644 --- a/opcodes/mips16-opc.c +++ b/opcodes/mips16-opc.c @@ -23,6 +23,116 @@ #include "sysdep.h" #include <stdio.h> #include "opcode/mips.h" +#include "mips-formats.h" + +static unsigned char reg_0_map[] = { 0 }; +static unsigned char reg_29_map[] = { 29 }; +static unsigned char reg_31_map[] = { 31 }; +static unsigned char reg_m16_map[] = { 16, 17, 2, 3, 4, 5, 6, 7 }; +static unsigned char reg32r_map[] = { + 0, 8, 16, 24, + 1, 9, 17, 25, + 2, 10, 18, 26, + 3, 11, 19, 27, + 4, 12, 20, 28, + 5, 13, 21, 29, + 6, 14, 22, 30, + 7, 15, 23, 31 +}; + +/* Return the meaning of operand character TYPE, or null if it isn't + recognized. If the operand is affected by the EXTEND instruction, + EXTENDED_P selects between the extended and unextended forms. + The extended forms all have an lsb of 0. */ + +const struct mips_operand * +decode_mips16_operand (char type, bfd_boolean extended_p) +{ + switch (type) + { + case '0': MAPPED_REG (0, 0, GP, reg_0_map); + + case 'L': SPECIAL (6, 5, ENTRY_EXIT_LIST); + case 'M': SPECIAL (7, 0, SAVE_RESTORE_LIST); + case 'P': SPECIAL (0, 0, PC); + case 'R': MAPPED_REG (0, 0, GP, reg_31_map); + case 'S': MAPPED_REG (0, 0, GP, reg_29_map); + case 'X': REG (5, 0, GP); + case 'Y': MAPPED_REG (5, 3, GP, reg32r_map); + case 'Z': MAPPED_REG (3, 0, GP, reg_m16_map); + + case 'a': JUMP (26, 0, 2); + case 'e': UINT (11, 0); + case 'i': JALX (26, 0, 2); + case 'l': SPECIAL (6, 5, ENTRY_EXIT_LIST); + case 'm': SPECIAL (7, 0, SAVE_RESTORE_LIST); + case 'v': MAPPED_REG (3, 8, GP, reg_m16_map); + case 'w': MAPPED_REG (3, 5, GP, reg_m16_map); + case 'x': MAPPED_REG (3, 8, GP, reg_m16_map); + case 'y': MAPPED_REG (3, 5, GP, reg_m16_map); + case 'z': MAPPED_REG (3, 2, GP, reg_m16_map); + } + + if (extended_p) + switch (type) + { + case '<': UINT (5, 0); + case '>': UINT (5, 0); + case '[': UINT (6, 0); + case ']': UINT (6, 0); + + case '4': SINT (15, 0); + case '5': SINT (16, 0); + case '6': SINT (16, 0); + case '8': SINT (16, 0); + + case 'A': PCREL (16, 0, 2, 0, TRUE, FALSE, FALSE); + case 'B': PCREL (16, 0, 3, 0, TRUE, FALSE, FALSE); + case 'C': SINT (16, 0); + case 'D': SINT (16, 0); + case 'E': PCREL (16, 0, 2, 0, TRUE, FALSE, FALSE); + case 'H': SINT (16, 0); + case 'K': SINT (16, 0); + case 'U': UINT (16, 0); + case 'V': SINT (16, 0); + case 'W': SINT (16, 0); + + case 'j': SINT (16, 0); + case 'k': SINT (16, 0); + case 'p': BRANCH (16, 0, 1); + case 'q': BRANCH (16, 0, 1); + } + else + switch (type) + { + case '<': INT_ADJ (3, 2, 8, 0, FALSE); + case '>': INT_ADJ (3, 8, 8, 0, FALSE); + case '[': INT_ADJ (3, 2, 8, 0, FALSE); + case ']': INT_ADJ (3, 8, 8, 0, FALSE); + + case '4': SINT (4, 0); + case '5': UINT (5, 0); + case '6': UINT (6, 5); + case '8': UINT (8, 0); + + case 'A': PCREL (8, 0, 2, 2, FALSE, FALSE, FALSE); + case 'B': PCREL (5, 0, 3, 3, FALSE, FALSE, FALSE); + case 'C': INT_ADJ (8, 0, 255, 3, FALSE); /* (0 .. 255) << 3 */ + case 'D': INT_ADJ (5, 0, 31, 3, FALSE); /* (0 .. 31) << 3 */ + case 'E': PCREL (5, 0, 2, 2, FALSE, FALSE, FALSE); + case 'H': INT_ADJ (5, 0, 31, 1, FALSE); /* (0 .. 31) << 1 */ + case 'K': INT_ADJ (8, 0, 127, 3, FALSE); /* (-128 .. 127) << 3 */ + case 'U': UINT (8, 0); + case 'V': INT_ADJ (8, 0, 255, 2, FALSE); /* (0 .. 255) << 2 */ + case 'W': INT_ADJ (5, 0, 31, 2, FALSE); /* (0 .. 31) << 2 */ + + case 'j': SINT (5, 0); + case 'k': SINT (8, 0); + case 'p': BRANCH (8, 0, 1); + case 'q': BRANCH (11, 0, 1); + } + return 0; +} /* This is the opcodes table for the mips16 processor. The format of this table is intentionally identical to the one in mips-opc.c. |