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Tue, 14 Apr 2020 13:06:48 -0700 (PDT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Subject: [PATCH v2 11/17] gdbstub: i386: Fix gdb_get_reg16() parameter to unbreak gdb Date: Tue, 14 Apr 2020 21:06:25 +0100 Message-Id: <20200414200631.12799-12-alex.bennee@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200414200631.12799-1-alex.bennee@linaro.org> References: <20200414200631.12799-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::32e 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: Eduardo Habkost , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Richard Henderson , Peter Xu , Paolo Bonzini , Richard Henderson , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Stefano Garzarella Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) From: Peter Xu We should only pass in gdb_get_reg16() with the GByteArray* object itself, no need to shift. Without this patch, gdb remote attach will crash QEMU: (gdb) target remote :1234 Remote debugging using :1234 Remote communication error. Target disconnected.: Connection reset by pe= er. $ qemu-system-x86_64 -m 1G -smp 4 ... -s ERROR:qemu/gdbstub.c:1843:handle_read_all_regs: assertion failed: (len = =3D=3D gdbserver_state.mem_buf->len) Bail out! ERROR:qemu/gdbstub.c:1843:handle_read_all_regs: assertion faile= d: (len =3D=3D gdbserver_state.mem_buf->len) Fixes: a010bdbe719 ("extend GByteArray to read register helpers") Signed-off-by: Peter Xu Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Alex Benn=C3=A9e Tested-by: Stefano Garzarella Reviewed-by: Richard Henderson Message-Id: <20200409164954.36902-3-peterx@redhat.com> --- v2 - tags and expand comment --- target/i386/gdbstub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/i386/gdbstub.c b/target/i386/gdbstub.c index f3d23b614ee..b98a99500ae 100644 --- a/target/i386/gdbstub.c +++ b/target/i386/gdbstub.c @@ -106,7 +106,7 @@ int x86_cpu_gdb_read_register(CPUState *cs, GByteArray = *mem_buf, int n) } else if (n >=3D IDX_FP_REGS && n < IDX_FP_REGS + 8) { floatx80 *fp =3D (floatx80 *) &env->fpregs[n - IDX_FP_REGS]; int len =3D gdb_get_reg64(mem_buf, cpu_to_le64(fp->low)); - len +=3D gdb_get_reg16(mem_buf + len, cpu_to_le16(fp->high)); + len +=3D gdb_get_reg16(mem_buf, cpu_to_le16(fp->high)); return len; } else if (n >=3D IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) { n -=3D IDX_XMM_REGS; --=20 2.20.1