mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-07-22 19:04:26 +00:00
e282010b2e
Currently the GDB's generate-core-file command doesn't work well with
qemu-user: the resulting dumps are huge [1] and at the same time
incomplete (argv and envp are missing). The reason is that GDB has no
access to proc mappings and therefore has to fall back to using
heuristics for discovering them. This is, in turn, because qemu-user
does not implement the Host I/O feature of the GDB Remote Serial
Protocol.
Implement vFile:{open,close,pread,readlink} and also
qXfer:exec-file:read+. With that, generate-core-file begins to work on
aarch64 and s390x.
[1] https://sourceware.org/pipermail/gdb-patches/2023-May/199432.html
Co-developed-by: Dominik 'Disconnect3d' Czarnota <dominik.b.czarnota@gmail.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20230621203627.1808446-7-iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230630180423.558337-37-alex.bennee@linaro.org>
421 lines
9.7 KiB
C
421 lines
9.7 KiB
C
/*
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* Target specific user-mode handling
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*
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* Copyright (c) 2003-2005 Fabrice Bellard
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* Copyright (c) 2022 Linaro Ltd
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*
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* SPDX-License-Identifier: LGPL-2.0+
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*/
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#include "qemu/osdep.h"
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#include "exec/gdbstub.h"
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#include "qemu.h"
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#include "internals.h"
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#ifdef CONFIG_LINUX
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#include "linux-user/loader.h"
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#include "linux-user/qemu.h"
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#endif
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/*
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* Map target signal numbers to GDB protocol signal numbers and vice
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* versa. For user emulation's currently supported systems, we can
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* assume most signals are defined.
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*/
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static int gdb_signal_table[] = {
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0,
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TARGET_SIGHUP,
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TARGET_SIGINT,
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TARGET_SIGQUIT,
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TARGET_SIGILL,
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TARGET_SIGTRAP,
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TARGET_SIGABRT,
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-1, /* SIGEMT */
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TARGET_SIGFPE,
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TARGET_SIGKILL,
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TARGET_SIGBUS,
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TARGET_SIGSEGV,
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TARGET_SIGSYS,
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TARGET_SIGPIPE,
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TARGET_SIGALRM,
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TARGET_SIGTERM,
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TARGET_SIGURG,
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TARGET_SIGSTOP,
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TARGET_SIGTSTP,
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TARGET_SIGCONT,
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TARGET_SIGCHLD,
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TARGET_SIGTTIN,
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TARGET_SIGTTOU,
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TARGET_SIGIO,
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TARGET_SIGXCPU,
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TARGET_SIGXFSZ,
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TARGET_SIGVTALRM,
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TARGET_SIGPROF,
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TARGET_SIGWINCH,
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-1, /* SIGLOST */
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TARGET_SIGUSR1,
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TARGET_SIGUSR2,
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#ifdef TARGET_SIGPWR
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TARGET_SIGPWR,
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#else
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-1,
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#endif
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-1, /* SIGPOLL */
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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-1,
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#ifdef __SIGRTMIN
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__SIGRTMIN + 1,
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__SIGRTMIN + 2,
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__SIGRTMIN + 3,
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__SIGRTMIN + 4,
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__SIGRTMIN + 5,
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__SIGRTMIN + 6,
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__SIGRTMIN + 7,
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__SIGRTMIN + 8,
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__SIGRTMIN + 9,
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__SIGRTMIN + 10,
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__SIGRTMIN + 11,
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__SIGRTMIN + 12,
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__SIGRTMIN + 13,
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__SIGRTMIN + 14,
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__SIGRTMIN + 15,
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__SIGRTMIN + 16,
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__SIGRTMIN + 17,
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__SIGRTMIN + 18,
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__SIGRTMIN + 19,
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__SIGRTMIN + 20,
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__SIGRTMIN + 28,
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__SIGRTMIN + 29,
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__SIGRTMIN + 30,
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__SIGRTMIN + 31,
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-1, /* SIGCANCEL */
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__SIGRTMIN,
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__SIGRTMIN + 32,
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__SIGRTMIN + 33,
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__SIGRTMIN + 34,
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__SIGRTMIN + 35,
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__SIGRTMIN + 36,
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__SIGRTMIN + 37,
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__SIGRTMIN + 38,
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__SIGRTMIN + 39,
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__SIGRTMIN + 40,
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__SIGRTMIN + 41,
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__SIGRTMIN + 42,
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__SIGRTMIN + 43,
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__SIGRTMIN + 44,
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__SIGRTMIN + 45,
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__SIGRTMIN + 46,
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__SIGRTMIN + 47,
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__SIGRTMIN + 48,
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__SIGRTMIN + 49,
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__SIGRTMIN + 50,
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__SIGRTMIN + 51,
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__SIGRTMIN + 52,
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__SIGRTMIN + 53,
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__SIGRTMIN + 54,
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__SIGRTMIN + 55,
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__SIGRTMIN + 56,
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__SIGRTMIN + 57,
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__SIGRTMIN + 58,
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__SIGRTMIN + 59,
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__SIGRTMIN + 60,
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__SIGRTMIN + 61,
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__SIGRTMIN + 62,
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__SIGRTMIN + 63,
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__SIGRTMIN + 64,
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__SIGRTMIN + 65,
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__SIGRTMIN + 66,
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__SIGRTMIN + 67,
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__SIGRTMIN + 68,
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__SIGRTMIN + 69,
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__SIGRTMIN + 70,
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__SIGRTMIN + 71,
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__SIGRTMIN + 72,
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__SIGRTMIN + 73,
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__SIGRTMIN + 74,
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__SIGRTMIN + 75,
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__SIGRTMIN + 76,
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__SIGRTMIN + 77,
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__SIGRTMIN + 78,
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__SIGRTMIN + 79,
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__SIGRTMIN + 80,
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__SIGRTMIN + 81,
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__SIGRTMIN + 82,
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__SIGRTMIN + 83,
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__SIGRTMIN + 84,
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__SIGRTMIN + 85,
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__SIGRTMIN + 86,
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__SIGRTMIN + 87,
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__SIGRTMIN + 88,
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__SIGRTMIN + 89,
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__SIGRTMIN + 90,
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__SIGRTMIN + 91,
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__SIGRTMIN + 92,
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__SIGRTMIN + 93,
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__SIGRTMIN + 94,
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__SIGRTMIN + 95,
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-1, /* SIGINFO */
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-1, /* UNKNOWN */
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-1, /* DEFAULT */
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-1,
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-1,
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-1,
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-1,
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-1,
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-1
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#endif
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};
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int gdb_signal_to_target(int sig)
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{
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if (sig < ARRAY_SIZE(gdb_signal_table)) {
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return gdb_signal_table[sig];
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} else {
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return -1;
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}
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}
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int gdb_target_signal_to_gdb(int sig)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(gdb_signal_table); i++) {
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if (gdb_signal_table[i] == sig) {
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return i;
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}
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}
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return GDB_SIGNAL_UNKNOWN;
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}
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int gdb_get_cpu_index(CPUState *cpu)
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{
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TaskState *ts = (TaskState *) cpu->opaque;
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return ts ? ts->ts_tid : -1;
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}
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/*
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* User-mode specific command helpers
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*/
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void gdb_handle_query_offsets(GArray *params, void *user_ctx)
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{
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TaskState *ts;
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ts = gdbserver_state.c_cpu->opaque;
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g_string_printf(gdbserver_state.str_buf,
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"Text=" TARGET_ABI_FMT_lx
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";Data=" TARGET_ABI_FMT_lx
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";Bss=" TARGET_ABI_FMT_lx,
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ts->info->code_offset,
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ts->info->data_offset,
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ts->info->data_offset);
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gdb_put_strbuf();
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}
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#if defined(CONFIG_LINUX)
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/* Partial user only duplicate of helper in gdbstub.c */
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static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
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uint8_t *buf, int len, bool is_write)
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{
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CPUClass *cc;
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cc = CPU_GET_CLASS(cpu);
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if (cc->memory_rw_debug) {
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return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
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}
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return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
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}
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void gdb_handle_query_xfer_auxv(GArray *params, void *user_ctx)
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{
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TaskState *ts;
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unsigned long offset, len, saved_auxv, auxv_len;
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if (params->len < 2) {
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gdb_put_packet("E22");
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return;
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}
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offset = get_param(params, 0)->val_ul;
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len = get_param(params, 1)->val_ul;
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ts = gdbserver_state.c_cpu->opaque;
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saved_auxv = ts->info->saved_auxv;
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auxv_len = ts->info->auxv_len;
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if (offset >= auxv_len) {
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gdb_put_packet("E00");
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return;
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}
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if (len > (MAX_PACKET_LENGTH - 5) / 2) {
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len = (MAX_PACKET_LENGTH - 5) / 2;
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}
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if (len < auxv_len - offset) {
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g_string_assign(gdbserver_state.str_buf, "m");
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} else {
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g_string_assign(gdbserver_state.str_buf, "l");
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len = auxv_len - offset;
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}
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g_byte_array_set_size(gdbserver_state.mem_buf, len);
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if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset,
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gdbserver_state.mem_buf->data, len, false)) {
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gdb_put_packet("E14");
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return;
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}
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gdb_memtox(gdbserver_state.str_buf,
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(const char *)gdbserver_state.mem_buf->data, len);
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gdb_put_packet_binary(gdbserver_state.str_buf->str,
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gdbserver_state.str_buf->len, true);
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}
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#endif
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static const char *get_filename_param(GArray *params, int i)
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{
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const char *hex_filename = get_param(params, i)->data;
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gdb_hextomem(gdbserver_state.mem_buf, hex_filename,
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strlen(hex_filename) / 2);
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g_byte_array_append(gdbserver_state.mem_buf, (const guint8 *)"", 1);
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return (const char *)gdbserver_state.mem_buf->data;
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}
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static void hostio_reply_with_data(const void *buf, size_t n)
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{
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g_string_printf(gdbserver_state.str_buf, "F%zx;", n);
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gdb_memtox(gdbserver_state.str_buf, buf, n);
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gdb_put_packet_binary(gdbserver_state.str_buf->str,
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gdbserver_state.str_buf->len, true);
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}
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void gdb_handle_v_file_open(GArray *params, void *user_ctx)
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{
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const char *filename = get_filename_param(params, 0);
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uint64_t flags = get_param(params, 1)->val_ull;
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uint64_t mode = get_param(params, 2)->val_ull;
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#ifdef CONFIG_LINUX
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int fd = do_guest_openat(gdbserver_state.g_cpu->env_ptr, 0, filename,
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flags, mode, false);
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#else
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int fd = open(filename, flags, mode);
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#endif
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if (fd < 0) {
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g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno);
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} else {
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g_string_printf(gdbserver_state.str_buf, "F%d", fd);
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}
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gdb_put_strbuf();
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}
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void gdb_handle_v_file_close(GArray *params, void *user_ctx)
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{
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int fd = get_param(params, 0)->val_ul;
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if (close(fd) == -1) {
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g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno);
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gdb_put_strbuf();
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return;
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}
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gdb_put_packet("F00");
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}
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void gdb_handle_v_file_pread(GArray *params, void *user_ctx)
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{
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int fd = get_param(params, 0)->val_ul;
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size_t count = get_param(params, 1)->val_ull;
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off_t offset = get_param(params, 2)->val_ull;
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size_t bufsiz = MIN(count, BUFSIZ);
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g_autofree char *buf = g_try_malloc(bufsiz);
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if (buf == NULL) {
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gdb_put_packet("E12");
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return;
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}
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ssize_t n = pread(fd, buf, bufsiz, offset);
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if (n < 0) {
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g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno);
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gdb_put_strbuf();
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return;
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}
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hostio_reply_with_data(buf, n);
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}
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void gdb_handle_v_file_readlink(GArray *params, void *user_ctx)
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{
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const char *filename = get_filename_param(params, 0);
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g_autofree char *buf = g_try_malloc(BUFSIZ);
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if (buf == NULL) {
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gdb_put_packet("E12");
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return;
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}
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#ifdef CONFIG_LINUX
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ssize_t n = do_guest_readlink(filename, buf, BUFSIZ);
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#else
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ssize_t n = readlink(filename, buf, BUFSIZ);
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#endif
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if (n < 0) {
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g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno);
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gdb_put_strbuf();
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return;
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}
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hostio_reply_with_data(buf, n);
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}
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void gdb_handle_query_xfer_exec_file(GArray *params, void *user_ctx)
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{
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uint32_t pid = get_param(params, 0)->val_ul;
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uint32_t offset = get_param(params, 1)->val_ul;
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uint32_t length = get_param(params, 2)->val_ul;
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GDBProcess *process = gdb_get_process(pid);
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if (!process) {
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gdb_put_packet("E00");
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return;
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}
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CPUState *cpu = gdb_get_first_cpu_in_process(process);
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if (!cpu) {
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gdb_put_packet("E00");
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return;
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}
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TaskState *ts = cpu->opaque;
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if (!ts || !ts->bprm || !ts->bprm->filename) {
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gdb_put_packet("E00");
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return;
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}
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size_t total_length = strlen(ts->bprm->filename);
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if (offset > total_length) {
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gdb_put_packet("E00");
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return;
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}
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if (offset + length > total_length) {
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length = total_length - offset;
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}
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g_string_printf(gdbserver_state.str_buf, "l%.*s", length,
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ts->bprm->filename + offset);
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gdb_put_strbuf();
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}
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