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2019-06-12gdbstub: Clear unused variables in gdb_handle_packetJon Doron1-9/+2
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-20-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement target halted (? pkt) with new infraJon Doron1-10/+25
Note: The user-mode thread-id has been correctly reported since bd88c780e6 Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-19-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement generic set/query (Q/q pkt) with new infraJon Doron1-186/+373
The generic set/query packets contains implementation for varioius sub-commands which are required for GDB and also additional commands which are QEMU specific. To see which QEMU specific commands are available use the command gdb> maintenance packet qqemu.Supported Currently the only implemented QEMU specific command is the command that sets the single step behavior. gdb> maintenance packet qqemu.sstepbits Will display the MASK bits used to control the single stepping. gdb> maintenance packet qqemu.sstep Will display the current value of the mask used when single stepping. gdb> maintenance packet Qqemu.sstep:HEX_VALUE Will change the single step mask. Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-18-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement v commands with new infraJon Doron1-60/+110
Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-17-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement step (s pkt) with new infraJon Doron1-6/+19
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-16-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement file io (F pkt) with new infraJon Doron1-22/+26
Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-15-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement read all registers (g pkt) with new infraJon Doron1-8/+23
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-14-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement write all registers (G pkt) with new infraJon Doron1-10/+31
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-13-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement read memory (m pkt) with new infraJon Doron1-16/+32
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-12-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement write memory (M pkt) with new infraJon Doron1-18/+33
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-11-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement get register (p pkt) with new infraJon Doron1-12/+38
Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-10-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement set register (P pkt) with new infraJon Doron1-9/+30
Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-9-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement breakpoint commands (Z/z pkt) with new infraJon Doron1-19/+67
Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-8-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement set_thread (H pkt) with new infraJon Doron1-30/+53
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-7-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement continue with signal (C pkt) with new infraJon Doron1-5/+29
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-6-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement continue (c pkt) with new infraJon Doron1-6/+19
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-5-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement thread_alive (T pkt) with new infraJon Doron1-11/+32
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-4-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Implement deatch (D pkt) with new infraJon Doron1-40/+61
Signed-off-by: Jon Doron <arilou@gmail.com> Message-Id: <20190529064148.19856-3-arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12gdbstub: Add infrastructure to parse cmd packetsJon Doron1-0/+195
Signed-off-by: Jon Doron <arilou@gmail.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20190529064148.19856-2-arilou@gmail.com> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
2019-06-12Include qemu-common.h exactly where neededMarkus Armbruster1-0/+1
No header includes qemu-common.h after this commit, as prescribed by qemu-common.h's file comment. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190523143508.25387-5-armbru@redhat.com> [Rebased with conflicts resolved automatically, except for include/hw/arm/xlnx-zynqmp.h hw/arm/nrf51_soc.c hw/arm/msf2-soc.c block/qcow2-refcount.c block/qcow2-cluster.c block/qcow2-cache.c target/arm/cpu.h target/lm32/cpu.h target/m68k/cpu.h target/mips/cpu.h target/moxie/cpu.h target/nios2/cpu.h target/openrisc/cpu.h target/riscv/cpu.h target/tilegx/cpu.h target/tricore/cpu.h target/unicore32/cpu.h target/xtensa/cpu.h; bsd-user/main.c and net/tap-bsd.c fixed up]
2019-06-12Include qemu/module.h where needed, drop it from qemu-common.hMarkus Armbruster1-0/+1
Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190523143508.25387-4-armbru@redhat.com> [Rebased with conflicts resolved automatically, except for hw/usb/dev-hub.c hw/misc/exynos4210_rng.c hw/misc/bcm2835_rng.c hw/misc/aspeed_scu.c hw/display/virtio-vga.c hw/arm/stm32f205_soc.c; ui/cocoa.m fixed up]
2019-06-11qemu-common: Move qemu_isalnum() etc. to qemu/ctype.hMarkus Armbruster1-0/+2
Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190523143508.25387-3-armbru@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-05-28semihosting: move semihosting configuration into its own directoryAlex Bennée1-1/+1
In preparation for having some more common semihosting code let's excise the current config magic from vl.c into its own file. We shall later add more conditionals to the build configurations so we can avoid building this if we don't need it. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
2019-05-22gdbstub: Fix misuse of isxdigit()Markus Armbruster1-7/+7
gdb_read_byte() passes its @ch argument to isxdigit(). Undefined behavior when the value is negative. Two callers: * gdb_chr_receive() passes an uint8_t value. Safe. * gdb_handlesig() a char value. Unsafe. Not a security issue, because the characters come from the gdb client, which is trusted. The obvious fix would be casting @ch to unsigned char. But note that gdb_read_byte() already casts @ch to uint8_t in many places. Uses of @ch without such a cast: (1) Compare to a character constant with == or != (2) s->linesum += ch (3) Store ch or ch ^ 0x20 into s->line_buf[] (4) Check for invalid RLE count: ch < ' ' || ch == '#' || ch == '$' || ch > 126 (5) Pass to isxdigit() (6) Pass to fromhex() Change the parameter type from int to uint8_t, and drop the now redundant casts. Affects the above uses as follows: (1) No change: the character constants are all non-negative. (2) Effectively no change: we only ever use s->linesum & 0xff, and s->linesum is int. (3) No change: s->line_buf[] is char[]. (4) No change. (5) Avoid undefined behavior. (6) No change: only reached when isxdigit(ch) Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190514180311.16028-5-armbru@redhat.com>
2019-05-22gdbstub: Reject invalid RLE repeat countsMarkus Armbruster1-1/+5
"Debugging with GDB / Appendix E GDB Remote Serial Protocol / Overview" specifies "The printable characters '#' and '$' or with a numeric value greater than 126 must not be used." gdb_read_byte() only rejects values < 32. This is wrong. Impact depends on the caller: * gdb_handlesig() passes a char. Incorrectly accepts '#', '$' and '\127'. * gdb_chr_receive() passes an uint8_t. Additionally accepts characters with the most-significant bit set. Correct the validity check to match the specification. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20190514180311.16028-4-armbru@redhat.com>
2019-03-26gdbstub: fix vCont packet handling when no thread is specifiedLuc Michel1-2/+12
The vCont packet accepts a series of actions, each being applied on a given thread ID. Giving no thread ID for an action is valid and means "all threads". This commit fixes vCont packets being incorrectly rejected when no thread ID was given for an action. In multiprocess mode, the GDB Remote Protocol specification is unclear on what "all threads" means. We choose to apply the action on all threads of all attached processes. This commit is based on the initial fix by Lucien Murray-Pitts. Fixes: e40e5204af8388 Reported-by: Lucien Murray-Pitts <lucienmp_antispam@yahoo.com> Reported-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20190325110452.6756-1-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-02-15gdbstub: Send a reply to the vKill packet.Sandra Loosemore1-0/+1
Per the GDB remote protocol documentation https://sourceware.org/gdb/current/onlinedocs/gdb/Packets.html#index-vKill-packet the debug stub is expected to send a reply to the 'vKill' packet. At least some versions of GDB crash if the gdb stub simply exits without sending a reply. This patch fixes QEMU's gdb stub to conform to the expected behavior. Note that QEMU's existing handling of the legacy 'k' packet is correct: in that case GDB does not expect a reply, and QEMU does not send one. Signed-off-by: Sandra Loosemore <sandra@codesourcery.com> Message-id: 1550008033-26540-1-git-send-email-sandra@codesourcery.com Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-02-13char: allow specifying a GMainContext at opening timePaolo Bonzini1-2/+2
This will be needed by vhost-user-test, when each test switches to its own GMainLoop and GMainContext. Otherwise, for a reconnecting socket the initial connection will happen on the default GMainContext, and no one will be listening on it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20190202110834.24880-1-pbonzini@redhat.com> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2019-02-05gdbstub: allow killing QEMU via vKill commandMax Filippov1-0/+4
With multiprocess extensions gdb uses 'vKill' packet instead of 'k' to kill the inferior. Handle 'vKill' the same way 'k' was handled in the presence of single process. Fixes: 7cf48f6752e5 ("gdbstub: add multiprocess support to (f|s)ThreadInfo and ThreadExtraInfo") Cc: Luc Michel <luc.michel@greensocs.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Reviewed-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: KONRAD Frederic <frederic.konrad@adacore.com> Tested-by: KONRAD Frederic <frederic.konrad@adacore.com> Message-id: 20190130192403.13754-1-jcmvbkbc@gmail.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-29gdbstub: Simplify gdb_get_cpu_pid() to use cpu->cluster_indexPeter Maydell1-42/+4
Now we're keeping the cluster index in the CPUState, we don't need to jump through hoops in gdb_get_cpu_pid() to find the associated cluster object. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Message-id: 20190121152218.9592-5-peter.maydell@linaro.org
2019-01-29gdbstub: fix gdb_get_cpu(s, pid, tid) when pid and/or tid are 0Luc Michel1-29/+43
a TID or PID value means "any thread" (resp. "any process"). This commit fixes the different combinations when at least one value is 0. When both are 0, the function now returns the first attached CPU, instead of the CPU with TID 1, which is not necessarily attached or even existent. When PID is specified but TID is 0, the function returns the first CPU in the process, or NULL if the process does not exist or is not attached. In other cases, it returns the corresponding CPU, while ignoring the PID check when PID is 0. Reported-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 20190119140000.11767-1-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess extension supportLuc Michel1-0/+6
Add multiprocess extension support by enabling multiprocess mode when the peer requests it, and by replying that we actually support it in the qSupported reply packet. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Message-id: 20181207090135.7651-16-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: gdb_set_stop_cpu: ignore request when process is not attachedLuc Michel1-0/+10
When gdb_set_stop_cpu() is called with a CPU associated to a process currently not attached by the GDB client, return without modifying the stop CPU. Otherwise, GDB gets confused if it receives packets with a thread-id it does not know about. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Message-id: 20181207090135.7651-15-luc.michel@greensocs.com [PMM: fix checkpatch comment style nit] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: processes initialization on new peer connectionLuc Michel1-5/+15
When a new connection is established, we set the first process to be attached, and the others detached. The first CPU of the first process is selected as the current CPU. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20181207090135.7651-14-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add support for vAttach packetsLuc Michel1-0/+35
Add support for the vAttach packets. In multiprocess mode, GDB sends them to attach to additional processes. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20181207090135.7651-13-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add support for extended mode packetLuc Michel1-0/+3
Add support for the '!' extended mode packet. This is required for the multiprocess extension. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20181207090135.7651-12-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess support to 'D' packetsLuc Michel1-7/+53
'D' packets are used by GDB to detach from a process. In multiprocess mode, the PID to detach from is sent in the request. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20181207090135.7651-11-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess support to gdb_vm_state_change()Luc Michel1-3/+12
Add support for multiprocess extension in gdb_vm_state_change() function. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20181207090135.7651-10-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess support to Xfer:features:read:Luc Michel1-20/+28
Change the Xfer:features:read: packet handling to support the multiprocess extension. This packet is used to request the XML description of the CPU. In multiprocess mode, different descriptions can be sent for different processes. This function now takes the process to send the description for as a parameter, and use a buffer in the process structure to store the generated description. It takes the first CPU of the process to generate the description. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20181207090135.7651-9-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess support to (f|s)ThreadInfo and ThreadExtraInfoLuc Michel1-10/+27
Change the thread info related packets handling to support multiprocess extension. Add the CPUs class name in the extra info to help differentiate them in multiprocess mode. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20181207090135.7651-8-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess support to 'sC' packetsLuc Michel1-3/+9
Change the sC packet handling to support the multiprocess extension. Instead of returning the first thread, we return the first thread of the current process. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Message-id: 20181207090135.7651-7-luc.michel@greensocs.com [PMM: corrected checkpatch comment style nit] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess support to vCont packetsLuc Michel1-15/+100
Add the gdb_first_attached_cpu() and gdb_next_attached_cpu() to iterate over all the CPUs in currently attached processes. Add the gdb_first_cpu_in_process() and gdb_next_cpu_in_process() to iterate over CPUs of a given process. Use them to add multiprocess extension support to vCont packets. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20181207090135.7651-6-luc.michel@greensocs.com [PMM: corrected checkpatch comment style nit] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess support to 'H' and 'T' packetsLuc Michel1-18/+136
Add a couple of helper functions to cope with GDB threads and processes. The gdb_get_process() function looks for a process given a pid. The gdb_get_cpu() function returns the CPU corresponding to the (pid, tid) pair given as parameters. The read_thread_id() function parses the thread-id sent by the peer. This function supports the multiprocess extension thread-id syntax. The return value specifies if the parsing failed, or if a special case was encountered (all processes or all threads). Use them in 'H' and 'T' packets handling to support the multiprocess extension. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20181207090135.7651-5-luc.michel@greensocs.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: add multiprocess support to '?' packetsLuc Michel1-2/+64
The gdb_get_cpu_pid() function does the PID lookup for the given CPU. It checks if the CPU is a direct child of a CPU cluster. If it is, the returned PID is the cluster ID plus one (cluster IDs start at 0, GDB PIDs at 1). When the CPU is not a child of such a container, the PID of the default process is returned. The gdb_fmt_thread_id() function generates the string to be used to identify a given thread, in a response packet for the peer. This function supports generating thread IDs when multiprocess mode is enabled (in the form `p<pid>.<tid>'). Use them in the reply to a '?' request. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Message-id: 20181207090135.7651-4-luc.michel@greensocs.com [PMM: fixed checkpatch blockquote style nit] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2019-01-07gdbstub: introduce GDB processesLuc Michel1-0/+97
Add a structure GDBProcess that represents processes from the GDB semantic point of view. CPUs can be split into different processes, by grouping them under different cpu-cluster objects. Each occurrence of a cpu-cluster object implies the existence of the corresponding process in the GDB stub. The GDB process ID is derived from the corresponding cluster ID as follows: GDB PID = cluster ID + 1 This is because PIDs -1 and 0 are reserved in GDB and cannot be used by processes. A default process is created to handle CPUs that are not in a cluster. This process gets the PID of the last process PID + 1. Signed-off-by: Luc Michel <luc.michel@greensocs.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20181207090135.7651-3-luc.michel@greensocs.com [PMM: fixed checkpatch nit about block comment style] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2018-10-16gdbstub: Remove unused includePhilippe Mathieu-Daudé1-1/+0
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
2018-10-03chardev: mark the calls that allow an implicit mux monitorMarc-André Lureau1-1/+5
This is mostly for readability of the code. Let's make it clear which callers can create an implicit monitor when the chardev is muxed. This will also enforce a safer behaviour, as we don't really support creating monitor anywhere/anytime at the moment. Add an assert() to make sure the programmer explicitely wanted that behaviour. There are documented cases, such as: -serial/-parallel/-virtioconsole and to less extent -debugcon. Less obvious and questionable ones are -gdb, SLIRP -guestfwd and Xen console. Add a FIXME note for those, but keep the support for now. Other qemu_chr_new() callers either have a fixed parameter/filename string or do not need it, such as -qtest: * qtest.c: qtest_init() Afaik, only used by tests/libqtest.c, without mux. I don't think we support it outside of qemu testing: drop support for implicit mux monitor (qemu_chr_new() call: no implicit mux now). * hw/ All with literal @filename argument that doesn't enable mux monitor. * tests/ All with @filename argument that doesn't enable mux monitor. On a related note, the list of monitor creation places: - the chardev creators listed above: all from command line (except perhaps Xen console?) - -gdb & hmp gdbserver will create a "GDB monitor command" chardev that is wired to an HMP monitor. - -mon command line option From this short study, I would like to think that a monitor may only be created in the main thread today, though I remain skeptical :) Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com>
2018-06-01gdbstub: Prevent fd leakagePhilippe Mathieu-Daudé1-0/+1
Since 2f652224f7, we now check if socket_set_nodelay() errored, but forgot to close the socket before reporting an error. Fixes: Coverity CID 1391290 (RESOURCE_LEAK) Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20180524223458.5651-1-f4bug@amsat.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2018-05-25gdbstub: Clarify what gdb_handlesig() is doingPeter Maydell1-0/+6
gdb_handlesig()'s behaviour is not entirely obvious at first glance. Add a doc comment for it, and also add a comment explaining why it's ok for gdb_do_syscallv() to ignore gdb_handlesig()'s return value. (Coverity complains about this: CID 1390850.) Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-Id: <20180515181958.25837-1-peter.maydell@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
2018-05-20gdbstub: Handle errors in gdb_accept()Peter Maydell1-4/+12
In gdb_accept(), we both fail to check all errors (notably that from socket_set_nodelay(), as Coverity notes in CID 1005666), and fail to return an error status back to our caller. Correct both of these things, so that errors in accept() result in our stopping with a useful error message rather than ignoring it. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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