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8 way that you might with a low-level debug facility like JTAG
74 While it is technically possible to debug a user-space program running
75 inside a system image, it does present challenges. Kernel preemption
80 a gdbserver exposed via a port to the outside world.
86 parallel flows of execution is a two layer one: it supports multiple
88 machine has more than one CPU, QEMU exposes each CPU cluster as a
89 separate "inferior", where each CPU within the cluster is a separate
90 "thread". Most QEMU machine types have identical CPUs, so there is a
93 machine has a cluster with one E51 core and a second cluster with four
109 Once connected, gdb will have a single inferior, for the
141 a unix socket (if supported by your operating system). This is useful when
142 running several tests in parallel, or if you do not have a known free TCP
145 First create a chardev with the appropriate options, then
157 Note that to use a unix socket for the connection you will need
167 service routines off. It is set this way because when gdb executes a
169 the IRQs and timer service routines on, a single step might jump into
171 current instruction. This means you may hit the same breakpoint a number
233 in case of the TCG emulation, which is not considered a security boundary, this
239 It is therefore a responsibility of the user to make sure that only authorized
240 clients can connect to it, e.g., by using a unix socket with proper
241 permissions, or by opening a TCP socket only on interfaces that are not