From: Jan Beulich <jbeulich@suse.com>
To: Binutils <binutils@sourceware.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>,
Andrew Waterman <andrew@sifive.com>,
Jim Wilson <jim.wilson.gcc@gmail.com>,
Nelson Chu <nelson@rivosinc.com>,
Kito Cheng <kito.cheng@sifive.com>
Subject: [PATCH v2] RISC-V: don't disassemble unrecognized insns as .byte
Date: Mon, 30 Jan 2023 15:40:38 +0100 [thread overview]
Message-ID: <ef8afeef-b35f-348c-7d4c-bac8081e9952@suse.com> (raw)
Insn width granularity being 16 bits, producing byte granular output
isn't very useful. With there being a way to specific otherwise
unknown insns to the assembler, use that same representation (to be
precise: its <length>,<encoding> flavor) for disassembly.
---
v2: Switch to using .insn.
--- a/binutils/testsuite/binutils-all/riscv/unknown.d
+++ b/binutils/testsuite/binutils-all/riscv/unknown.d
@@ -1,11 +1,11 @@
#as: -march=rv32ic
#objdump: -d
# Test the disassembly of unknown instruction encodings, specifically,
-# ensure that we generate a .?byte opcode.
+# ensure that we generate a .insn directive.
#...
Disassembly of section \.text:
[0-9a-f]+ <\.text>:
- [0-9a-f]+: 0052018b \.4byte 0x52018b
- [0-9a-f]+: 9c45 \.2byte 0x9c45
+ [0-9a-f]+: 0052018b \.insn 4, 0x0052018b
+ [0-9a-f]+: 9c45 \.insn 2, 0x9c45
--- a/gas/testsuite/gas/riscv/insn.d
+++ b/gas/testsuite/gas/riscv/insn.d
@@ -92,25 +92,25 @@ Disassembly of section .text:
[^:]+:[ ]+607f 0000 0000 0000[ ]+[._a-z].*
[^:]+:[ ]+0000 0000 0000 0000 ?
[^:]+:[ ]+0000 0000 0000 ?
-[^:]+:[ ]+007f 0000 0000 0000[ ]+\.byte[ ]+0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80
+[^:]+:[ ]+007f 0000 0000 0000[ ]+\.insn[ ]+10, +0x8000000000000000007f
[^:]+:[ ]+8000 ?
-[^:]+:[ ]+007f 0000 0000 0000[ ]+\.byte[ ]+0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80
+[^:]+:[ ]+007f 0000 0000 0000[ ]+\.insn[ ]+10, +0x8000000000000000007f
[^:]+:[ ]+8000 ?
-[^:]+:[ ]+607f 89ab 4567 0123[ ]+\.byte[ ]+0x7f, 0x60, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+[^:]+:[ ]+607f 89ab 4567 0123[ ]+\.insn[ ]+22, 0xfedcba98765432100123456789ab607f
[^:]+:[ ]+3210 7654 ba98 fedc ?
[^:]+:[ ]+0000 0000 0000 ?
-[^:]+:[ ]+607f 89ab 4567 0123[ ]+\.byte[ ]+0x7f, 0x60, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+[^:]+:[ ]+607f 89ab 4567 0123[ ]+\.insn[ ]+22, 0xfedcba98765432100123456789ab607f
[^:]+:[ ]+3210 7654 ba98 fedc ?
[^:]+:[ ]+0000 0000 0000 ?
-[^:]+:[ ]+607f 33cc 55aa cdef[ ]+\.byte[ ]+0x7f, 0x60, 0xcc, 0x33, 0xaa, 0x55, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0x00
+[^:]+:[ ]+607f 33cc 55aa cdef[ ]+\.insn[ ]+22, 0x00dcba98765432100123456789abcdef55aa33cc607f
[^:]+:[ ]+89ab 4567 0123 3210 ?
[^:]+:[ ]+7654 ba98 00dc ?
-[^:]+:[ ]+607f 33cc 55aa cdef[ ]+\.byte[ ]+0x7f, 0x60, 0xcc, 0x33, 0xaa, 0x55, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0x00
+[^:]+:[ ]+607f 33cc 55aa cdef[ ]+\.insn[ ]+22, 0x00dcba98765432100123456789abcdef55aa33cc607f
[^:]+:[ ]+89ab 4567 0123 3210 ?
[^:]+:[ ]+7654 ba98 00dc ?
-[^:]+:[ ]+607f 33cc 55aa cdef[ ]+\.byte[ ]+0x7f, 0x60, 0xcc, 0x33, 0xaa, 0x55, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe
+[^:]+:[ ]+607f 33cc 55aa cdef[ ]+\.insn[ ]+22, 0xfedcba98765432100123456789abcdef55aa33cc607f
[^:]+:[ ]+89ab 4567 0123 3210 ?
[^:]+:[ ]+7654 ba98 fedc ?
-[^:]+:[ ]+607f 33cc 55aa cdef[ ]+\.byte[ ]+0x7f, 0x60, 0xcc, 0x33, 0xaa, 0x55, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe
+[^:]+:[ ]+607f 33cc 55aa cdef[ ]+\.insn[ ]+22, 0xfedcba98765432100123456789abcdef55aa33cc607f
[^:]+:[ ]+89ab 4567 0123 3210 ?
[^:]+:[ ]+7654 ba98 fedc ?
--- a/gas/testsuite/gas/riscv/insn-na.d
+++ b/gas/testsuite/gas/riscv/insn-na.d
@@ -73,11 +73,11 @@ Disassembly of section .text:
[^:]+:[ ]+007f 0000 0000 0000 0000[ ]+[._a-z].*
[^:]+:[ ]+0000107f 00000000 00000000[ ]+[._a-z].*
[^:]+:[ ]+607f 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000[ ]+[._a-z].*
-[^:]+:[ ]+007f 0000 0000 0000 8000[ ]+\.byte[ ]+0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80
-[^:]+:[ ]+007f 0000 0000 0000 8000[ ]+\.byte[ ]+0x7f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80
-[^:]+:[ ]+607f 89ab 4567 0123 3210 7654 ba98 fedc 0000 0000 0000[ ]+\.byte[ ]+0x7f, 0x60, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
-[^:]+:[ ]+607f 89ab 4567 0123 3210 7654 ba98 fedc 0000 0000 0000[ ]+\.byte[ ]+0x7f, 0x60, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
-[^:]+:[ ]+607f 33cc 55aa cdef 89ab 4567 0123 3210 7654 ba98 00dc[ ]+\.byte[ ]+0x7f, 0x60, 0xcc, 0x33, 0xaa, 0x55, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0x00
-[^:]+:[ ]+607f 33cc 55aa cdef 89ab 4567 0123 3210 7654 ba98 00dc[ ]+\.byte[ ]+0x7f, 0x60, 0xcc, 0x33, 0xaa, 0x55, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0x00
-[^:]+:[ ]+607f 33cc 55aa cdef 89ab 4567 0123 3210 7654 ba98 fedc[ ]+\.byte[ ]+0x7f, 0x60, 0xcc, 0x33, 0xaa, 0x55, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe
-[^:]+:[ ]+607f 33cc 55aa cdef 89ab 4567 0123 3210 7654 ba98 fedc[ ]+\.byte[ ]+0x7f, 0x60, 0xcc, 0x33, 0xaa, 0x55, 0xef, 0xcd, 0xab, 0x89, 0x67, 0x45, 0x23, 0x01, 0x10, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe
+[^:]+:[ ]+007f 0000 0000 0000 8000[ ]+\.insn[ ]+10, +0x8000000000000000007f
+[^:]+:[ ]+007f 0000 0000 0000 8000[ ]+\.insn[ ]+10, +0x8000000000000000007f
+[^:]+:[ ]+607f 89ab 4567 0123 3210 7654 ba98 fedc 0000 0000 0000[ ]+\.insn[ ]+22, 0xfedcba98765432100123456789ab607f
+[^:]+:[ ]+607f 89ab 4567 0123 3210 7654 ba98 fedc 0000 0000 0000[ ]+\.insn[ ]+22, 0xfedcba98765432100123456789ab607f
+[^:]+:[ ]+607f 33cc 55aa cdef 89ab 4567 0123 3210 7654 ba98 00dc[ ]+\.insn[ ]+22, 0x00dcba98765432100123456789abcdef55aa33cc607f
+[^:]+:[ ]+607f 33cc 55aa cdef 89ab 4567 0123 3210 7654 ba98 00dc[ ]+\.insn[ ]+22, 0x00dcba98765432100123456789abcdef55aa33cc607f
+[^:]+:[ ]+607f 33cc 55aa cdef 89ab 4567 0123 3210 7654 ba98 fedc[ ]+\.insn[ ]+22, 0xfedcba98765432100123456789abcdef55aa33cc607f
+[^:]+:[ ]+607f 33cc 55aa cdef 89ab 4567 0123 3210 7654 ba98 fedc[ ]+\.insn[ ]+22, 0xfedcba98765432100123456789abcdef55aa33cc607f
--- a/opcodes/riscv-dis.c
+++ b/opcodes/riscv-dis.c
@@ -650,7 +650,8 @@ riscv_disassemble_insn (bfd_vma memaddr,
static bool init = false;
static const struct riscv_opcode *riscv_hash[OP_MASK_OP + 1];
struct riscv_private_data *pd;
- int insnlen;
+ int insnlen, i;
+ bool printed;
#define OP_HASH_IDX(i) ((i) & (riscv_insn_length (i) == 2 ? 0x3 : OP_MASK_OP))
@@ -666,8 +667,6 @@ riscv_disassemble_insn (bfd_vma memaddr,
if (info->private_data == NULL)
{
- int i;
-
pd = info->private_data = xcalloc (1, sizeof (struct riscv_private_data));
pd->gp = 0;
pd->print_addr = 0;
@@ -783,37 +782,28 @@ riscv_disassemble_insn (bfd_vma memaddr,
}
}
- /* We did not find a match, so just print the instruction bits. */
+ /* We did not find a match, so just print the instruction bits in
+ the shape of an assembler .insn directive. */
info->insn_type = dis_noninsn;
- switch (insnlen)
+ (*info->fprintf_styled_func)
+ (info->stream, dis_style_assembler_directive, ".insn");
+ (*info->fprintf_styled_func) (info->stream, dis_style_text, "\t");
+ (*info->fprintf_styled_func) (info->stream, dis_style_immediate,
+ "%d", insnlen);
+ (*info->fprintf_styled_func) (info->stream, dis_style_text, ", ");
+ (*info->fprintf_styled_func) (info->stream, dis_style_immediate, "0x");
+ for (i = insnlen, printed = false; i >= 2; )
{
- case 2:
- case 4:
- case 8:
- (*info->fprintf_styled_func)
- (info->stream, dis_style_assembler_directive, ".%dbyte", insnlen);
- (*info->fprintf_styled_func) (info->stream, dis_style_text, "\t");
+ i -= 2;
+ word = bfd_get_bits (packet + i, 16, false);
+ if (!word && !printed)
+ continue;
+
(*info->fprintf_styled_func) (info->stream, dis_style_immediate,
- "0x%llx", (unsigned long long) word);
- break;
- default:
- {
- int i;
- (*info->fprintf_styled_func)
- (info->stream, dis_style_assembler_directive, ".byte");
- (*info->fprintf_styled_func) (info->stream, dis_style_text, "\t");
- for (i = 0; i < insnlen; ++i)
- {
- if (i > 0)
- (*info->fprintf_styled_func) (info->stream, dis_style_text,
- ", ");
- (*info->fprintf_styled_func) (info->stream, dis_style_immediate,
- "0x%02x",
- (unsigned int) (*packet++));
- }
- }
- break;
+ "%04x", (unsigned int) word);
+ printed = true;
}
+
return insnlen;
}
next reply other threads:[~2023-01-30 14:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-30 14:40 Jan Beulich [this message]
2023-01-31 1:47 ` Nelson Chu
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