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Thu, 09 Apr 2020 11:25:47 -0700 (PDT) X-Google-Smtp-Source: APiQypKakBdFqhbAHvUpBRceralisIeVvxfK4jSk2syX+7vmgV/djq7CyemxbLQS2k3RmcEwl3oY2Q== X-Received: by 2002:adf:92a3:: with SMTP id 32mr514598wrn.254.1586456746978; Thu, 09 Apr 2020 11:25:46 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Subject: [PATCH v2 1/2] gdbstub: Assert len read from each register Date: Thu, 9 Apr 2020 14:25:37 -0400 Message-Id: <20200409182538.40816-2-peterx@redhat.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200409182538.40816-1-peterx@redhat.com> References: <20200409182538.40816-1-peterx@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , peterx@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" This can expose the issue earlier on which register returned the wrong result. Signed-off-by: Peter Xu --- gdbstub.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/gdbstub.c b/gdbstub.c index 171e150950..69656e1052 100644 --- a/gdbstub.c +++ b/gdbstub.c @@ -911,17 +911,23 @@ static int gdb_read_register(CPUState *cpu, GByteArra= y *buf, int reg) CPUClass *cc =3D CPU_GET_CLASS(cpu); CPUArchState *env =3D cpu->env_ptr; GDBRegisterState *r; + int len =3D 0, orig_len =3D buf->len; =20 if (reg < cc->gdb_num_core_regs) { - return cc->gdb_read_register(cpu, buf, reg); + len =3D cc->gdb_read_register(cpu, buf, reg); + goto out; } =20 for (r =3D cpu->gdb_regs; r; r =3D r->next) { if (r->base_reg <=3D reg && reg < r->base_reg + r->num_regs) { - return r->get_reg(env, buf, reg - r->base_reg); + len =3D r->get_reg(env, buf, reg - r->base_reg); + break; } } - return 0; + +out: + assert(len =3D=3D buf->len - orig_len); + return len; } =20 static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) --=20 2.24.1