* [PATCH v3 1/3] RISC-V: Make "priv-spec" overridable
2022-11-20 2:23 [PATCH v3 0/3] RISC-V: Add overridable "priv-spec" and "arch" disassembler options Tsukasa OI
@ 2022-11-20 2:23 ` Tsukasa OI
2022-11-20 2:23 ` [PATCH v3 2/3] RISC-V: Add "arch" disassembler option Tsukasa OI
2022-11-20 2:23 ` [PATCH v3 3/3] gdb/testsuite: RISC-V disassembler option tests Tsukasa OI
2 siblings, 0 replies; 4+ messages in thread
From: Tsukasa OI @ 2022-11-20 2:23 UTC (permalink / raw)
To: Tsukasa OI, Nelson Chu, Kito Cheng, Palmer Dabbelt; +Cc: binutils, gdb-patches
From: Tsukasa OI <research_trasio@irq.a4lg.com>
This commit makes existing disassembler option "priv-spec" overridable on
ELF files with attributes.
Existing implementation is helpful on debugging binary files but on ELF
files, the value specified by "priv-spec" option must match the attributes.
However, there's a case where privileged specification ELF attributes and
actual CSRs as used in the program differs. For instance, OpenSBI is the
prime example.
This commit enables objdump and GDB to ignore ELF attributes but instead
use custom specification (e.g. even if OpenSBI is compiled with priv-spec
1.11 toolchain, we can correctly disassemble with priv-spec=1.12 option).
gas/ChangeLog:
* testsuite/gas/riscv/dis-priv-spec-override.s: New privileged
specification override tests.
* testsuite/gas/riscv/dis-priv-spec-override-1.d: Likewise.
* testsuite/gas/riscv/dis-priv-spec-override-2.d: Likewise.
opcodes/ChangeLog:
* riscv-dis.c (default_priv_spec) Set to initial default version.
(priv_spec, is_custom_priv_spec) New.
(is_init_csr): Define as a file-scope variable instead a local
variable of print_insn_args.
(init_riscv_dis_state_for_arch_and_options): Keep track of
"priv-spec" changes.
(set_default_riscv_dis_options): Initialize "priv-spec".
(parse_riscv_dis_option): Make "priv-spec" overridable.
(print_insn_args): Use file-scope is_init_csr variable.
(riscv_get_disassembler): Move fallback of default_priv_spec
from print_insn_args. Initialize "priv-spec".
---
.../gas/riscv/dis-priv-spec-override-1.d | 10 +++
.../gas/riscv/dis-priv-spec-override-2.d | 10 +++
.../gas/riscv/dis-priv-spec-override.s | 2 +
opcodes/riscv-dis.c | 70 ++++++++++++-------
4 files changed, 68 insertions(+), 24 deletions(-)
create mode 100644 gas/testsuite/gas/riscv/dis-priv-spec-override-1.d
create mode 100644 gas/testsuite/gas/riscv/dis-priv-spec-override-2.d
create mode 100644 gas/testsuite/gas/riscv/dis-priv-spec-override.s
diff --git a/gas/testsuite/gas/riscv/dis-priv-spec-override-1.d b/gas/testsuite/gas/riscv/dis-priv-spec-override-1.d
new file mode 100644
index 000000000000..2cceebbf35a4
--- /dev/null
+++ b/gas/testsuite/gas/riscv/dis-priv-spec-override-1.d
@@ -0,0 +1,10 @@
+#as: -march=rv64i_zicsr -mpriv-spec=1.11
+#source: dis-priv-spec-override.s
+#objdump: -d -M priv-spec=1.12
+
+.*:[ ]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ ]+[0-9a-f]+:[ ]+3d002573[ ]+csrr[ ]+a0,pmpaddr32
diff --git a/gas/testsuite/gas/riscv/dis-priv-spec-override-2.d b/gas/testsuite/gas/riscv/dis-priv-spec-override-2.d
new file mode 100644
index 000000000000..200955e0ffe5
--- /dev/null
+++ b/gas/testsuite/gas/riscv/dis-priv-spec-override-2.d
@@ -0,0 +1,10 @@
+#as: -march=rv64i_zicsr -mpriv-spec=1.12
+#source: dis-priv-spec-override.s
+#objdump: -d -M priv-spec=1.11
+
+.*:[ ]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ ]+[0-9a-f]+:[ ]+3d002573[ ]+csrr[ ]+a0,0x3d0
diff --git a/gas/testsuite/gas/riscv/dis-priv-spec-override.s b/gas/testsuite/gas/riscv/dis-priv-spec-override.s
new file mode 100644
index 000000000000..c3d1726e0b5a
--- /dev/null
+++ b/gas/testsuite/gas/riscv/dis-priv-spec-override.s
@@ -0,0 +1,2 @@
+target:
+ csrr a0, 0x3d0
diff --git a/opcodes/riscv-dis.c b/opcodes/riscv-dis.c
index 328a34501549..e7dded63c402 100644
--- a/opcodes/riscv-dis.c
+++ b/opcodes/riscv-dis.c
@@ -49,7 +49,16 @@ static enum riscv_spec_class default_isa_spec = ISA_SPEC_CLASS_DRAFT - 1;
/* Default privileged specification
(as specified by the ELF attributes or the `priv-spec' option). */
-static enum riscv_spec_class default_priv_spec = PRIV_SPEC_CLASS_NONE;
+static enum riscv_spec_class default_priv_spec = PRIV_SPEC_CLASS_DRAFT - 1;
+
+/* Current privileged specification version. */
+static enum riscv_spec_class priv_spec = PRIV_SPEC_CLASS_DRAFT - 1;
+
+/* If set, a custom privileged specification is specified. */
+static bool is_custom_priv_spec = false;
+
+/* Reset when reinitializing the CSR hash table is required. */
+static bool is_init_csr = false;
/* RISC-V disassembler architecture context type. */
typedef struct
@@ -205,6 +214,18 @@ init_riscv_dis_state_for_arch (void)
static void
init_riscv_dis_state_for_arch_and_options (void)
{
+ static bool init = false;
+ static enum riscv_spec_class prev_priv_spec;
+ /* Set current privileged specification. */
+ if (!is_custom_priv_spec)
+ priv_spec = default_priv_spec;
+ /* First call to this function. */
+ if (!init)
+ {
+ init = true;
+ /* Save initial options. */
+ prev_priv_spec = priv_spec;
+ }
/* If the architecture string is changed, update XLEN. */
if (is_arch_changed)
update_riscv_dis_xlen (NULL);
@@ -215,7 +236,12 @@ init_riscv_dis_state_for_arch_and_options (void)
= !riscv_subset_supports (&riscv_rps_dis, "zfinx")
? (is_numeric ? riscv_fpr_names_numeric : riscv_fpr_names_abi)
: riscv_gpr_names;
+ /* Reset CSR hash table if either the architecture or the privileged
+ specification version is changed. */
+ if (prev_priv_spec != priv_spec)
+ is_init_csr = false;
/* Save previous options and mark them "unchanged". */
+ prev_priv_spec = priv_spec;
is_arch_changed = false;
}
@@ -267,6 +293,7 @@ set_default_riscv_dis_options (void)
{
no_aliases = false;
is_numeric = false;
+ is_custom_priv_spec = false;
}
/* Parse RISC-V disassembler option (without arguments). */
@@ -314,21 +341,18 @@ parse_riscv_dis_option (const char *option)
value = equal + 1;
if (strcmp (option, "priv-spec") == 0)
{
- enum riscv_spec_class priv_spec = PRIV_SPEC_CLASS_NONE;
- const char *name = NULL;
-
- RISCV_GET_PRIV_SPEC_CLASS (value, priv_spec);
- if (priv_spec == PRIV_SPEC_CLASS_NONE)
- opcodes_error_handler (_("unknown privileged spec set by %s=%s"),
- option, value);
- else if (default_priv_spec == PRIV_SPEC_CLASS_NONE)
- default_priv_spec = priv_spec;
- else if (default_priv_spec != priv_spec)
+ enum riscv_spec_class priv_spec_new = PRIV_SPEC_CLASS_NONE;
+ RISCV_GET_PRIV_SPEC_CLASS (value, priv_spec_new);
+ if (priv_spec_new == PRIV_SPEC_CLASS_NONE)
{
- RISCV_GET_PRIV_SPEC_NAME (name, default_priv_spec);
- opcodes_error_handler (_("mis-matched privilege spec set by %s=%s, "
- "the elf privilege attribute is %s"),
- option, value, name);
+ opcodes_error_handler (_ ("unknown privileged spec set by %s=%s."
+ "not overriding"),
+ option, value);
+ }
+ else
+ {
+ is_custom_priv_spec = true;
+ priv_spec = priv_spec_new;
}
}
else
@@ -721,31 +745,26 @@ print_insn_args (const char *oparg, insn_t l, bfd_vma pc, disassemble_info *info
case 'E':
{
static const char *riscv_csr_hash[4096]; /* Total 2^12 CSRs. */
- static bool init_csr = false;
unsigned int csr = EXTRACT_OPERAND (CSR, l);
- if (!init_csr)
+ if (!is_init_csr)
{
unsigned int i;
for (i = 0; i < 4096; i++)
riscv_csr_hash[i] = NULL;
- /* Set to the newest privileged version. */
- if (default_priv_spec == PRIV_SPEC_CLASS_NONE)
- default_priv_spec = PRIV_SPEC_CLASS_DRAFT - 1;
-
#define DECLARE_CSR(name, num, class, define_version, abort_version) \
if (riscv_csr_hash[num] == NULL \
&& ((define_version == PRIV_SPEC_CLASS_NONE \
&& abort_version == PRIV_SPEC_CLASS_NONE) \
- || (default_priv_spec >= define_version \
- && default_priv_spec < abort_version))) \
+ || (priv_spec >= define_version \
+ && priv_spec < abort_version))) \
riscv_csr_hash[num] = #name;
#define DECLARE_CSR_ALIAS(name, num, class, define_version, abort_version) \
DECLARE_CSR (name, num, class, define_version, abort_version)
#include "opcode/riscv-opc.h"
#undef DECLARE_CSR
- init_csr = true;
+ is_init_csr = true;
}
if (riscv_csr_hash[csr] != NULL)
@@ -1283,6 +1302,9 @@ riscv_get_disassembler (bfd *abfd)
in the attributes, use the default value. */
if (!default_arch)
default_arch = initial_default_arch;
+ /* By default, set to the newest privileged version. */
+ if (default_priv_spec == PRIV_SPEC_CLASS_NONE)
+ default_priv_spec = PRIV_SPEC_CLASS_DRAFT - 1;
}
}
--
2.38.1
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v3 2/3] RISC-V: Add "arch" disassembler option
2022-11-20 2:23 [PATCH v3 0/3] RISC-V: Add overridable "priv-spec" and "arch" disassembler options Tsukasa OI
2022-11-20 2:23 ` [PATCH v3 1/3] RISC-V: Make "priv-spec" overridable Tsukasa OI
@ 2022-11-20 2:23 ` Tsukasa OI
2022-11-20 2:23 ` [PATCH v3 3/3] gdb/testsuite: RISC-V disassembler option tests Tsukasa OI
2 siblings, 0 replies; 4+ messages in thread
From: Tsukasa OI @ 2022-11-20 2:23 UTC (permalink / raw)
To: Tsukasa OI, Nelson Chu, Kito Cheng, Palmer Dabbelt; +Cc: binutils, gdb-patches
From: Tsukasa OI <research_trasio@irq.a4lg.com>
This commit adds new disassembler option "arch" to override architecture
string. Existing implementations is helpful on regular ELF files but
for instance, when debugging a binary with OpenOCD + GDB, there's a case
where such information is not available.
Also, there's a case where changing the architecture to disassemble is
helpful, even on ELF files. For instance, OpenSBI is the prime example.
This commit enables objdump and GDB to use custom architecture string
instead of ELF attributes and mapping symbols (e.g. even if OpenSBI is
compiled with -march=rv64gc, we can enable H extension when disassembling
OpenSBI by specifying an architecture string: rv64gch).
It can be also helpful to test overwrapping encodings (e.g. standard hints).
gas/ChangeLog:
* testsuite/gas/riscv/dis-arch-override.s: New arch override tests.
* testsuite/gas/riscv/dis-arch-override-1.d: Likewise.
* testsuite/gas/riscv/dis-arch-override-2.d: Likewise.
* testsuite/gas/riscv/dis-arch-override-3.d: Likewise.
opcodes/ChangeLog:
* riscv-dis.c (is_custom_arch) New.
(update_riscv_dis_xlen): Update XLEN precedence rules.
(set_default_riscv_dis_options): Initialize "arch".
(parse_riscv_dis_option): Add the "arch" option.
(riscv_get_map_state): Ignore ISA string from mapping symbols if
custom "arch" is specified.
(riscv_get_disassembler): Update the architecture depending on the
custom "arch" option.
(riscv_option_arg_t) Add RISCV_OPTION_ARG_ARCH.
(riscv_options): Add the "arch" option.
(disassembler_options_riscv): Add the "arch" option.
---
gas/testsuite/gas/riscv/dis-arch-override-1.d | 13 ++++++
gas/testsuite/gas/riscv/dis-arch-override-2.d | 13 ++++++
gas/testsuite/gas/riscv/dis-arch-override-3.d | 13 ++++++
gas/testsuite/gas/riscv/dis-arch-override.s | 45 +++++++++++++++++++
opcodes/riscv-dis.c | 30 +++++++++++--
5 files changed, 111 insertions(+), 3 deletions(-)
create mode 100644 gas/testsuite/gas/riscv/dis-arch-override-1.d
create mode 100644 gas/testsuite/gas/riscv/dis-arch-override-2.d
create mode 100644 gas/testsuite/gas/riscv/dis-arch-override-3.d
create mode 100644 gas/testsuite/gas/riscv/dis-arch-override.s
diff --git a/gas/testsuite/gas/riscv/dis-arch-override-1.d b/gas/testsuite/gas/riscv/dis-arch-override-1.d
new file mode 100644
index 000000000000..1df81236e2aa
--- /dev/null
+++ b/gas/testsuite/gas/riscv/dis-arch-override-1.d
@@ -0,0 +1,13 @@
+#as: -march=rv64imfd_zbb
+#source: dis-arch-override.s
+#objdump: -d
+
+.*:[ ]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ ]+[0-9a-f]+:[ ]+00c5f053[ ]+fadd\.s[ ]+ft0,fa1,fa2
+[ ]+[0-9a-f]+:[ ]+02c5f053[ ]+fadd\.d[ ]+ft0,fa1,fa2
+[ ]+[0-9a-f]+:[ ]+30102573[ ]+csrr[ ]+a0,misa
+[ ]+[0-9a-f]+:[ ]+0805c53b[ ]+zext\.h[ ]+a0,a1
diff --git a/gas/testsuite/gas/riscv/dis-arch-override-2.d b/gas/testsuite/gas/riscv/dis-arch-override-2.d
new file mode 100644
index 000000000000..a556f293fb52
--- /dev/null
+++ b/gas/testsuite/gas/riscv/dis-arch-override-2.d
@@ -0,0 +1,13 @@
+#as: -march=rv64imfd_zbb
+#source: dis-arch-override.s
+#objdump: -d -M arch=rv32im_zfinx_zbkb
+
+.*:[ ]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ ]+[0-9a-f]+:[ ]+00c5f053[ ]+fadd\.s[ ]+zero,a1,a2
+[ ]+[0-9a-f]+:[ ]+02c5f053[ ]+\.4byte[ ]+0x2c5f053
+[ ]+[0-9a-f]+:[ ]+30102573[ ]+csrr[ ]+a0,misa
+[ ]+[0-9a-f]+:[ ]+0805c53b[ ]+packw[ ]+a0,a1,zero
diff --git a/gas/testsuite/gas/riscv/dis-arch-override-3.d b/gas/testsuite/gas/riscv/dis-arch-override-3.d
new file mode 100644
index 000000000000..924da72b2797
--- /dev/null
+++ b/gas/testsuite/gas/riscv/dis-arch-override-3.d
@@ -0,0 +1,13 @@
+#as: -march=rv64imfd_zbb
+#source: dis-arch-override.s
+#objdump: -d -m riscv -M arch=rv32im_zfinx_zbkb,numeric
+
+.*:[ ]+file format .*
+
+Disassembly of section .text:
+
+0+000 <target>:
+[ ]+[0-9a-f]+:[ ]+00c5f053[ ]+fadd\.s[ ]+x0,x11,x12
+[ ]+[0-9a-f]+:[ ]+02c5f053[ ]+\.4byte[ ]+0x2c5f053
+[ ]+[0-9a-f]+:[ ]+30102573[ ]+csrr[ ]+x10,misa
+[ ]+[0-9a-f]+:[ ]+0805c53b[ ]+\.4byte[ ]+0x805c53b
diff --git a/gas/testsuite/gas/riscv/dis-arch-override.s b/gas/testsuite/gas/riscv/dis-arch-override.s
new file mode 100644
index 000000000000..0c2fec44ed3a
--- /dev/null
+++ b/gas/testsuite/gas/riscv/dis-arch-override.s
@@ -0,0 +1,45 @@
+# Assembler configuration:
+# -march=rv64imfd_zbb
+# Disassembler configurations:
+# Test 1: -d
+# Test 2: -d -M arch=rv32im_zfinx_zbkb
+# Test 3: -d -m riscv -M arch=rv32im_zfinx_zbkb,numeric
+
+target:
+ # Assembler : fadd.s (F)
+ # Disassembler (test 2/3) : fadd.s (Zfinx)
+ # Test that all three operands point to GPRs.
+ fadd.s ft0, fa1, fa2
+
+ # Assembler : fadd.d (D)
+ # Disassembler (test 2/3) : (invalid)
+ # On disassembler option on test 2, Zdinx is not present. So,
+ # it should be disassembled as an invalid instruction.
+ fadd.d ft0, fa1, fa2
+
+ # Assembler : csrr (Zicsr)
+ # Disassembler (test 2/3) : csrr (Zicsr)
+ # When assembling, Zicsr is implied by F. When disassembling,
+ # Zicsr is implied by Zfinx. On both cases, csrr should be
+ # disassembled as csrr.
+ csrr a0, misa
+
+ # Assembler : zext.h (Zbb)
+ # Disassembler (test 2) : packw (Zbkb)
+ # Disassembler (test 3) : (invalid)
+ # Since zext.h specialized instruction does not exist in Zbkb
+ # and we disassemble the output with Zbkb, this instruction
+ # should be disassembled as a packw instruction (on RV64).
+ #
+ # We specify arch=rv32im_zfinx_zbkb on disassembling on test
+ # 2 and 3. But, XLEN part of the ISA string is effective
+ # only if XLEN-neutral machine is specified by `-m riscv' option
+ # (because we are disassembling 64-bit RISC-V ELF file, BFD
+ # architecture is set to `riscv:rv64' unless `-m' option
+ # is specified).
+ #
+ # As a result, test 3 (with `-m riscv' option) disassembles with
+ # RV32 but test 2 (without it) does with RV64.
+ # It changes the result of disassembling since packw instruction
+ # is invalid on RV32.
+ zext.h a0, a1
diff --git a/opcodes/riscv-dis.c b/opcodes/riscv-dis.c
index e7dded63c402..03272d4f64ce 100644
--- a/opcodes/riscv-dis.c
+++ b/opcodes/riscv-dis.c
@@ -35,6 +35,9 @@
/* Default architecture string (if not available). */
static const char *const initial_default_arch = "rv64gc";
+/* If set, a custom architecture string is specified. */
+static bool is_custom_arch = false;
+
/* Current XLEN for the disassembler. */
static unsigned xlen = 0;
@@ -183,8 +186,10 @@ update_riscv_dis_xlen (struct disassemble_info *info)
This is only effective if XLEN-specific BFD machine architecture is
chosen. If XLEN-neutral (like riscv), BFD machine architecture is
ignored on XLEN selection.
- 2. Non-default RISC-V architecture string set by either an ELF
- attribute or a mapping symbol with ISA string.
+ 2. Non-default RISC-V architecture string set by either:
+ a. -M arch=... option (GDB: set disassembler-options arch=...),
+ b. A mapping symbol with ISA string or
+ c. An ELF attribute
3. ELF class in dummy ELF header. */
if (xlen_by_mach != 0)
xlen = xlen_by_mach;
@@ -294,6 +299,7 @@ set_default_riscv_dis_options (void)
no_aliases = false;
is_numeric = false;
is_custom_priv_spec = false;
+ is_custom_arch = false;
}
/* Parse RISC-V disassembler option (without arguments). */
@@ -355,6 +361,11 @@ parse_riscv_dis_option (const char *option)
priv_spec = priv_spec_new;
}
}
+ else if (strcmp (option, "arch") == 0)
+ {
+ is_custom_arch = true;
+ update_riscv_dis_arch (&dis_arch_context_override, value);
+ }
else
{
/* xgettext:c-format */
@@ -1024,6 +1035,9 @@ riscv_get_map_state (int n,
*state = newstate;
if (newstate == MAP_INSN && update)
{
+ /* Skip if a custom architecture is specified. */
+ if (is_custom_arch)
+ return true;
if (arch)
{
/* Override the architecture. */
@@ -1308,7 +1322,10 @@ riscv_get_disassembler (bfd *abfd)
}
}
- update_riscv_dis_arch (&dis_arch_context_default, default_arch);
+ if (is_custom_arch)
+ set_riscv_dis_arch_context (&dis_arch_context_default, default_arch);
+ else
+ update_riscv_dis_arch (&dis_arch_context_default, default_arch);
return print_insn_riscv;
}
@@ -1359,6 +1376,7 @@ riscv_symbol_is_valid (asymbol * sym,
typedef enum
{
RISCV_OPTION_ARG_NONE = -1,
+ RISCV_OPTION_ARG_ARCH,
RISCV_OPTION_ARG_PRIV_SPEC,
RISCV_OPTION_ARG_COUNT
@@ -1376,6 +1394,9 @@ static struct
{ "numeric",
N_("Print numeric register names, rather than ABI names."),
RISCV_OPTION_ARG_NONE },
+ { "arch=",
+ N_("Disassemble using specified ISA and extensions."),
+ RISCV_OPTION_ARG_ARCH },
{ "no-aliases",
N_("Disassemble only into canonical instructions."),
RISCV_OPTION_ARG_NONE },
@@ -1403,6 +1424,9 @@ disassembler_options_riscv (void)
args = XNEWVEC (disasm_option_arg_t, num_args + 1);
+ args[RISCV_OPTION_ARG_ARCH].name = "ARCH";
+ args[RISCV_OPTION_ARG_ARCH].values = NULL;
+
args[RISCV_OPTION_ARG_PRIV_SPEC].name = "SPEC";
priv_spec_count = PRIV_SPEC_CLASS_DRAFT - PRIV_SPEC_CLASS_NONE - 1;
args[RISCV_OPTION_ARG_PRIV_SPEC].values
--
2.38.1
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v3 3/3] gdb/testsuite: RISC-V disassembler option tests
2022-11-20 2:23 [PATCH v3 0/3] RISC-V: Add overridable "priv-spec" and "arch" disassembler options Tsukasa OI
2022-11-20 2:23 ` [PATCH v3 1/3] RISC-V: Make "priv-spec" overridable Tsukasa OI
2022-11-20 2:23 ` [PATCH v3 2/3] RISC-V: Add "arch" disassembler option Tsukasa OI
@ 2022-11-20 2:23 ` Tsukasa OI
2 siblings, 0 replies; 4+ messages in thread
From: Tsukasa OI @ 2022-11-20 2:23 UTC (permalink / raw)
To: Tsukasa OI, Nelson Chu, Kito Cheng, Palmer Dabbelt; +Cc: binutils, gdb-patches
From: Tsukasa OI <research_trasio@irq.a4lg.com>
This commit adds RISC-V disassembler option tests for:
- "no-aliases" and "numeric" options
- overridable "priv-spec" option
- new "arch" option
and makes sure that option override correctly works and they can be unset
thereafter (with "set disassembler-options" with no options).
---
.../gdb.arch/riscv-disassembler-options.exp | 129 ++++++++++++++++++
.../gdb.arch/riscv-disassembler-options.s | 29 ++++
2 files changed, 158 insertions(+)
create mode 100644 gdb/testsuite/gdb.arch/riscv-disassembler-options.exp
create mode 100644 gdb/testsuite/gdb.arch/riscv-disassembler-options.s
diff --git a/gdb/testsuite/gdb.arch/riscv-disassembler-options.exp b/gdb/testsuite/gdb.arch/riscv-disassembler-options.exp
new file mode 100644
index 000000000000..e5548eb426d3
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/riscv-disassembler-options.exp
@@ -0,0 +1,129 @@
+# Copyright 2022 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Test RISC-V disassembler options.
+
+if {![istarget "riscv*-*-*"]} {
+ verbose "Skipping ${gdb_test_file_name}."
+ return
+}
+
+standard_testfile .s
+set objfile [standard_output_file ${testfile}.o]
+
+set compile_flags { \
+ "additional_flags=-march=rv64i_zicsr -mabi=lp64" \
+ "additional_flags=-Xassembler -mpriv-spec=1.11" \
+ }
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${objfile}" object \
+ ${compile_flags}] != "" } {
+ untested "could not compile test program"
+ return
+}
+
+clean_restart ${objfile}
+
+proc riscv_set_disassembler_options { opts } {
+ gdb_test_no_output "set disassembler-options $opts"
+ gdb_test "show disassembler-options" \
+ "The current disassembler options are '$opts'\r\n.*" \
+ "show disassembler-options: $opts"
+}
+
+# We can disable disassembly using alias instructions.
+riscv_set_disassembler_options "no-aliases"
+gdb_test_sequence "disassemble test_func" "option: no-aliases" {
+ "Dump of assembler code for function test_func:\r\n"
+ "\[^:\]+:\taddi\ta0,zero,1\r\n"
+ "\[^:\]+:\tcsrrs\ta0,0x3d0,zero\r\n"
+ "\[^:\]+:\t\\.4byte\t0x62000073\r\n"
+ "\[^:\]+:\tjalr\tzero,0\\(ra\\)\r\n"
+ "End of assembler dump\."
+}
+
+# We can disassemble using numeric register names.
+riscv_set_disassembler_options "numeric"
+gdb_test_sequence "disassemble test_func" "option: numeric" {
+ "Dump of assembler code for function test_func:\r\n"
+ "\[^:\]+:\tli\tx10,1\r\n"
+ "\[^:\]+:\tcsrr\tx10,0x3d0\r\n"
+ "\[^:\]+:\t\\.4byte\t0x62000073\r\n"
+ "\[^:\]+:\tret\r\n"
+ "End of assembler dump\."
+}
+
+# We can switch to the privileged specification 1.11.
+riscv_set_disassembler_options "priv-spec=1.11"
+gdb_test_sequence "disassemble test_func" "privileged specification 1.11 CSRs" {
+ "Dump of assembler code for function test_func:\r\n"
+ "\[^:\]+:\tli\ta0,1\r\n"
+ "\[^:\]+:\tcsrr\ta0,0x3d0\r\n"
+ "\[^:\]+:\t\\.4byte\t0x62000073\r\n"
+ "\[^:\]+:\tret\r\n"
+ "End of assembler dump\."
+}
+
+# We can switch to the privileged specification 1.12.
+riscv_set_disassembler_options "priv-spec=1.12"
+gdb_test_sequence "disassemble test_func" "privileged specification 1.12 CSRs" {
+ "Dump of assembler code for function test_func:\r\n"
+ "\[^:\]+:\tli\ta0,1\r\n"
+ "\[^:\]+:\tcsrr\ta0,pmpaddr32\r\n"
+ "\[^:\]+:\t\\.4byte\t0x62000073\r\n"
+ "\[^:\]+:\tret\r\n"
+ "End of assembler dump\."
+}
+
+# We can enable the 'H'-extension support.
+riscv_set_disassembler_options "arch=rv64gch"
+gdb_test_sequence "disassemble test_func" "'H'-extension" {
+ "Dump of assembler code for function test_func:\r\n"
+ "\[^:\]+:\tli\ta0,1\r\n"
+ "\[^:\]+:\tcsrr\ta0,0x3d0\r\n"
+ "\[^:\]+:\thfence\\.gvma\r\n"
+ "\[^:\]+:\tret\r\n"
+ "End of assembler dump\."
+}
+
+# We can set multiple comma-separated options
+riscv_set_disassembler_options "arch=rv64gch,priv-spec=1.12,no-aliases,numeric"
+gdb_test_sequence "disassemble test_func" "multiple options" {
+ "Dump of assembler code for function test_func:\r\n"
+ "\[^:\]+:\taddi\tx10,x0,1\r\n"
+ "\[^:\]+:\tcsrrs\tx10,pmpaddr32,x0\r\n"
+ "\[^:\]+:\thfence\\.gvma\tx0,x0\r\n"
+ "\[^:\]+:\tjalr\tx0,0\\(x1\\)\r\n"
+ "End of assembler dump\."
+}
+
+# Once we set empty disassembler option, we can restore the default one.
+# Defaults:
+# - enable aliases
+# - ABI register names
+# - priv-spec=1.11
+# - arch=rv64i_zicsr
+gdb_test_no_output "set disassembler-options" "set NULL disassembler-options"
+gdb_test "show disassembler-options" \
+ "The current disassembler options are ''\r\n.*" \
+ "show NULL disassembler-options"
+gdb_test_sequence "disassemble test_func" "restore to default" {
+ "Dump of assembler code for function test_func:\r\n"
+ "\[^:\]+:\tli\ta0,1\r\n"
+ "\[^:\]+:\tcsrr\ta0,0x3d0\r\n"
+ "\[^:\]+:\t\\.4byte\t0x62000073\r\n"
+ "\[^:\]+:\tret\r\n"
+ "End of assembler dump\."
+}
diff --git a/gdb/testsuite/gdb.arch/riscv-disassembler-options.s b/gdb/testsuite/gdb.arch/riscv-disassembler-options.s
new file mode 100644
index 000000000000..fc33b03b0c00
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/riscv-disassembler-options.s
@@ -0,0 +1,29 @@
+/* Copyright 2022 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+ .attribute arch, "rv64i_zicsr"
+ .option nopic
+ .text
+
+ .align 1
+ .globl test_func
+ .type test_func, @function
+test_func:
+ li a0, 1
+ csrr a0, 0x3d0
+ # hfence.gvma (an alias of hfence.gvma zero,zero)
+ .insn 0x62000073
+ ret
+ .size test_func, .-test_func
--
2.38.1
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