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| author | David Daney | 2022-10-14 13:23:22 +0200 |
|---|---|---|
| committer | Philippe Mathieu-Daudé | 2022-10-31 11:32:07 +0100 |
| commit | a6d89b454cec2de235595ea311d3cc3c49c3aaaa (patch) | |
| tree | 390ce98002871c64b12abe9596f9ac3455486ed1 | |
| parent | disas/nanomips: Rename nanomips.cpp to nanomips.c (diff) | |
| download | qemu-a6d89b454cec2de235595ea311d3cc3c49c3aaaa.tar.gz qemu-a6d89b454cec2de235595ea311d3cc3c49c3aaaa.tar.xz qemu-a6d89b454cec2de235595ea311d3cc3c49c3aaaa.zip | |
disas/mips: Fix branch displacement for BEQZC and BNEZC
disas/mips.c got added in commit 6643d27ea0 ("MIPS disas support")
apparently based on binutils tag 'gdb_6_1-branchpoint' [1].
Back then, MIPSr6 was not supported (added in binutils commit
7361da2c952 during 2014 [2]).
Binutils codebase diverged so much over the last 18 years, it is
not possible to simply cherry-pick their changes, so fix it BEQZC /
BNEZC 21-bit signed branch displacement locally.
[1] https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=opcodes/mips-dis.c;hb=refs/tags/gdb_6_1-branchpoint
[2] https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=7361da2c952
Fixes: 31837be3ee ("target-mips: add compact and CP1 branches")
Signed-off-by: David Daney <david.daney@fungible.com>
Reviewed-by: Marcin Nowakowski <marcin.nowakowski@fungible.com>
[PMD: Added commit description]
Signed-off-by: Philippe Mathieu-Daudé <philmd@fungible.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221014112322.61119-1-philmd@fungible.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
| -rw-r--r-- | disas/mips.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/disas/mips.c b/disas/mips.c index b9a5204304..5aacacb2c8 100644 --- a/disas/mips.c +++ b/disas/mips.c @@ -20,6 +20,7 @@ You should have received a copy of the GNU General Public License along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include "qemu/osdep.h" +#include "qemu/bitops.h" #include "disas/dis-asm.h" /* mips.h. Mips opcode list for GDB, the GNU debugger. @@ -1334,9 +1335,9 @@ const struct mips_opcode mips_builtin_opcodes[] = {"balc", "+p", 0xe8000000, 0xfc000000, UBD|WR_31, 0, I32R6}, {"bc", "+p", 0xc8000000, 0xfc000000, UBD|WR_31, 0, I32R6}, {"jic", "t,o", 0xd8000000, 0xffe00000, UBD|RD_t, 0, I32R6}, -{"beqzc", "s,+p", 0xd8000000, 0xfc000000, CBD|RD_s, 0, I32R6}, +{"beqzc", "s,+q", 0xd8000000, 0xfc000000, CBD|RD_s, 0, I32R6}, {"jialc", "t,o", 0xf8000000, 0xffe00000, UBD|RD_t, 0, I32R6}, -{"bnezc", "s,+p", 0xf8000000, 0xfc000000, CBD|RD_s, 0, I32R6}, +{"bnezc", "s,+q", 0xf8000000, 0xfc000000, CBD|RD_s, 0, I32R6}, {"beqzalc", "s,t,p", 0x20000000, 0xffe00000, CBD|RD_s|RD_t, 0, I32R6}, {"bovc", "s,t,p", 0x20000000, 0xfc000000, CBD|RD_s|RD_t, 0, I32R6}, {"beqc", "s,t,p", 0x20000000, 0xfc000000, CBD|RD_s|RD_t, 0, I32R6}, @@ -4462,6 +4463,13 @@ print_insn_args (const char *d, (*info->print_address_func) (info->target, info); break; + case 'q': + /* Sign extend the displacement with 21 bits. */ + delta = sextract32(l, OP_SH_DELTA, 21); + info->target = (delta << 2) + pc + INSNLEN; + (*info->print_address_func) (info->target, info); + break; + case 't': /* Coprocessor 0 reg name */ (*info->fprintf_func) (info->stream, "%s", mips_cp0_names[(l >> OP_SH_RT) & |