From 2d1777b530d7832db5d8d7017378354c28816554 Mon Sep 17 00:00:00 2001 From: Neal Frager Date: Thu, 19 Oct 2023 12:37:40 +0100 Subject: [PATCH] opcodes: microblaze: Fix bit masking bug There is currently a bug in the bit masking for the barrel shift instructions because the bit mask is not including all of the register bits which must be zero. With this patch, the disassembler can be sure that the 32-bit value is indeed a barrel shift instruction and not a data value in memory. This fix can be verified by assembling and disassembling the following: .text .long 0x65005f5f With this patch, the bug is fixed, and the objdump will know that 0x65005f5f is not a barrel shift instruction. Signed-off-by: Neal Frager Signed-off-by: Michael J. Eager --- gas/testsuite/gas/microblaze/allinsn.d | 4 ++-- opcodes/microblaze-dis.c | 4 ++-- opcodes/microblaze-opc.h | 11 +++++++---- 3 files changed, 11 insertions(+), 8 deletions(-) diff --git a/gas/testsuite/gas/microblaze/allinsn.d b/gas/testsuite/gas/microblaze/allinsn.d index 312e3fb3805..83175f134dc 100644 --- a/gas/testsuite/gas/microblaze/allinsn.d +++ b/gas/testsuite/gas/microblaze/allinsn.d @@ -49,7 +49,7 @@ Disassembly of section .text: 40: 900001e2 swaph r0, r0 00000044 : - 44: 64004041 bsrli r0, r0, 1 + 44: 64004041 bsefi r0, r0, 1, 1 00000048 : - 48: 64008041 bsrli r0, r0, 1 + 48: 64008041 bsifi r0, r0, 1, 1 diff --git a/opcodes/microblaze-dis.c b/opcodes/microblaze-dis.c index 468797befc7..0b5262255fb 100644 --- a/opcodes/microblaze-dis.c +++ b/opcodes/microblaze-dis.c @@ -35,7 +35,7 @@ #define get_int_field_imm(instr) ((instr & IMM_MASK) >> IMM_LOW) #define get_int_field_r1(instr) ((instr & RA_MASK) >> RA_LOW) -#define NUM_STRBUFS 3 +#define NUM_STRBUFS 4 #define STRBUF_SIZE 25 struct string_buf @@ -279,7 +279,7 @@ print_insn_microblaze (bfd_vma memaddr, struct disassemble_info * info) prev_insn_vma = curr_insn_vma; if (op->name == NULL) - print_func (stream, ".short 0x%04x", (unsigned int) inst); + print_func (stream, ".long 0x%04x", (unsigned int) inst); else { print_func (stream, "%s", op->name); diff --git a/opcodes/microblaze-opc.h b/opcodes/microblaze-opc.h index 811b5cbeb0f..b9045f67969 100644 --- a/opcodes/microblaze-opc.h +++ b/opcodes/microblaze-opc.h @@ -92,8 +92,11 @@ #define OPCODE_MASK_H124 0xFFFF07FF /* High 16, and low 11 bits. */ #define OPCODE_MASK_H1234 0xFFFFFFFF /* All 32 bits. */ #define OPCODE_MASK_H3 0xFC000600 /* High 6 bits and bits 21, 22. */ +#define OPCODE_MASK_H3B 0xFC00F9E0 /* High 6 bits and bits 16:20 and + bits 23:26. */ #define OPCODE_MASK_H32 0xFC00FC00 /* High 6 bits and bit 16-21. */ -#define OPCODE_MASK_H32B 0xFC00C000 /* High 6 bits and bit 16, 17. */ +#define OPCODE_MASK_H32B 0xFC00F820 /* High 6 bits and bits 16:20 and + bit 26 */ #define OPCODE_MASK_H34B 0xFC0000FF /* High 6 bits and low 8 bits. */ #define OPCODE_MASK_H35B 0xFC0004FF /* High 6 bits and low 9 bits. */ #define OPCODE_MASK_H34C 0xFC0007E0 /* High 6 bits and bits 21-26. */ @@ -160,9 +163,9 @@ const struct op_code_struct {"ncget", INST_TYPE_RD_RFSL, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x6C006000, OPCODE_MASK_H32, ncget, anyware_inst }, {"ncput", INST_TYPE_R1_RFSL, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x6C00E000, OPCODE_MASK_H32, ncput, anyware_inst }, {"muli", INST_TYPE_RD_R1_IMM, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x60000000, OPCODE_MASK_H, muli, mult_inst }, - {"bslli", INST_TYPE_RD_R1_IMM5, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x64000400, OPCODE_MASK_H3, bslli, barrel_shift_inst }, - {"bsrai", INST_TYPE_RD_R1_IMM5, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x64000200, OPCODE_MASK_H3, bsrai, barrel_shift_inst }, - {"bsrli", INST_TYPE_RD_R1_IMM5, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x64000000, OPCODE_MASK_H3, bsrli, barrel_shift_inst }, + {"bslli", INST_TYPE_RD_R1_IMM5, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x64000400, OPCODE_MASK_H3B, bslli, barrel_shift_inst }, + {"bsrai", INST_TYPE_RD_R1_IMM5, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x64000200, OPCODE_MASK_H3B, bsrai, barrel_shift_inst }, + {"bsrli", INST_TYPE_RD_R1_IMM5, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x64000000, OPCODE_MASK_H3B, bsrli, barrel_shift_inst }, {"bsefi", INST_TYPE_RD_R1_IMMW_IMMS, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x64004000, OPCODE_MASK_H32B, bsefi, barrel_shift_inst }, {"bsifi", INST_TYPE_RD_R1_IMMW_IMMS, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x64008000, OPCODE_MASK_H32B, bsifi, barrel_shift_inst }, {"or", INST_TYPE_RD_R1_R2, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x80000000, OPCODE_MASK_H4, microblaze_or, logical_inst }, -- 2.30.2