mirror of
https://gitlab.com/qemu-project/qemu.git
synced 2024-10-06 21:49:46 +03:00
ce6c541dcb
Added get_ucontext_sigreturn function to check processor state ensuring current execution mode is EL0 and no flags indicating interrupts or exceptions are set. Updated AArch64 code to use CF directly without reading/writing the entire processor state, improving efficiency. Changed FP data structures to use Int128 instead of __uint128_t, leveraging QEMU's generic mechanism for referencing this type. Signed-off-by: Stacey Son <sson@FreeBSD.org> Signed-off-by: Ajeet Singh <itachis@FreeBSD.org> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240707191128.10509-9-itachis@FreeBSD.org> Signed-off-by: Warner Losh <imp@bsdimp.com>
517 lines
19 KiB
C
517 lines
19 KiB
C
/*
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* qemu bsd user mode definition
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef QEMU_H
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#define QEMU_H
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#include <sys/param.h>
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#include "qemu/int128.h"
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#include "cpu.h"
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#include "qemu/units.h"
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#include "exec/cpu_ldst.h"
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#include "exec/exec-all.h"
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#include "user/abitypes.h"
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extern char **environ;
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#include "user/thunk.h"
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#include "target_arch.h"
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#include "syscall_defs.h"
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#include "target_syscall.h"
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#include "target_os_vmparam.h"
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#include "target_os_signal.h"
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#include "target.h"
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#include "exec/gdbstub.h"
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#include "exec/page-protection.h"
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#include "qemu/clang-tsa.h"
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#include "accel/tcg/vcpu-state.h"
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#include "qemu-os.h"
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/*
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* TODO: Remove these and rely only on qemu_real_host_page_size().
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*/
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extern uintptr_t qemu_host_page_size;
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extern intptr_t qemu_host_page_mask;
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#define HOST_PAGE_ALIGN(addr) ROUND_UP((addr), qemu_host_page_size)
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/*
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* This struct is used to hold certain information about the image. Basically,
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* it replicates in user space what would be certain task_struct fields in the
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* kernel
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*/
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struct image_info {
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abi_ulong load_bias;
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abi_ulong load_addr;
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abi_ulong start_code;
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abi_ulong end_code;
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abi_ulong start_data;
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abi_ulong end_data;
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abi_ulong brk;
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abi_ulong rss;
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abi_ulong start_stack;
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abi_ulong entry;
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abi_ulong code_offset;
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abi_ulong data_offset;
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abi_ulong arg_start;
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abi_ulong arg_end;
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uint32_t elf_flags;
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};
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struct emulated_sigtable {
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int pending; /* true if signal is pending */
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target_siginfo_t info;
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};
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/*
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* NOTE: we force a big alignment so that the stack stored after is aligned too
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*/
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struct TaskState {
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pid_t ts_tid; /* tid (or pid) of this task */
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struct TaskState *next;
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struct bsd_binprm *bprm;
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struct image_info *info;
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struct emulated_sigtable sync_signal;
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/*
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* TODO: Since we block all signals while returning to the main CPU
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* loop, this needn't be an array
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*/
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struct emulated_sigtable sigtab[TARGET_NSIG];
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/*
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* Nonzero if process_pending_signals() needs to do something (either
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* handle a pending signal or unblock signals).
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* This flag is written from a signal handler so should be accessed via
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* the qatomic_read() and qatomic_set() functions. (It is not accessed
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* from multiple threads.)
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*/
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int signal_pending;
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/* True if we're leaving a sigsuspend and sigsuspend_mask is valid. */
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bool in_sigsuspend;
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/*
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* This thread's signal mask, as requested by the guest program.
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* The actual signal mask of this thread may differ:
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* + we don't let SIGSEGV and SIGBUS be blocked while running guest code
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* + sometimes we block all signals to avoid races
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*/
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sigset_t signal_mask;
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/*
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* The signal mask imposed by a guest sigsuspend syscall, if we are
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* currently in the middle of such a syscall
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*/
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sigset_t sigsuspend_mask;
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/* This thread's sigaltstack, if it has one */
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struct target_sigaltstack sigaltstack_used;
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} __attribute__((aligned(16)));
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void stop_all_tasks(void);
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extern const char *interp_prefix;
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extern const char *qemu_uname_release;
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/*
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* TARGET_ARG_MAX defines the number of bytes allocated for arguments
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* and envelope for the new program. 256k should suffice for a reasonable
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* maximum env+arg in 32-bit environments, bump it up to 512k for !ILP32
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* platforms.
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*/
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#if TARGET_ABI_BITS > 32
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#define TARGET_ARG_MAX (512 * KiB)
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#else
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#define TARGET_ARG_MAX (256 * KiB)
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#endif
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#define MAX_ARG_PAGES (TARGET_ARG_MAX / TARGET_PAGE_SIZE)
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/*
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* This structure is used to hold the arguments that are
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* used when loading binaries.
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*/
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struct bsd_binprm {
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char buf[128];
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void *page[MAX_ARG_PAGES];
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abi_ulong p;
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abi_ulong stringp;
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int fd;
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int e_uid, e_gid;
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int argc, envc;
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char **argv;
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char **envp;
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char *filename; /* (Given) Name of binary */
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char *fullpath; /* Full path of binary */
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int (*core_dump)(int, CPUArchState *);
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};
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void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
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abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
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abi_ulong stringp);
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int loader_exec(const char *filename, char **argv, char **envp,
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struct target_pt_regs *regs, struct image_info *infop,
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struct bsd_binprm *bprm);
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int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
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struct image_info *info);
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int load_flt_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs,
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struct image_info *info);
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int is_target_elf_binary(int fd);
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abi_long memcpy_to_target(abi_ulong dest, const void *src,
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unsigned long len);
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void target_set_brk(abi_ulong new_brk);
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abi_long do_brk(abi_ulong new_brk);
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void syscall_init(void);
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abi_long do_freebsd_syscall(void *cpu_env, int num, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4,
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abi_long arg5, abi_long arg6, abi_long arg7,
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abi_long arg8);
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abi_long do_netbsd_syscall(void *cpu_env, int num, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4,
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abi_long arg5, abi_long arg6);
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abi_long do_openbsd_syscall(void *cpu_env, int num, abi_long arg1,
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abi_long arg2, abi_long arg3, abi_long arg4,
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abi_long arg5, abi_long arg6);
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void gemu_log(const char *fmt, ...) G_GNUC_PRINTF(1, 2);
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extern __thread CPUState *thread_cpu;
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void cpu_loop(CPUArchState *env);
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char *target_strerror(int err);
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int get_osversion(void);
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void fork_start(void);
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void fork_end(pid_t pid);
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#include "qemu/log.h"
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/* strace.c */
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struct syscallname {
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int nr;
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const char *name;
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const char *format;
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void (*call)(const struct syscallname *,
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abi_long, abi_long, abi_long,
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abi_long, abi_long, abi_long);
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void (*result)(const struct syscallname *, abi_long);
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};
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void
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print_freebsd_syscall(int num,
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abi_long arg1, abi_long arg2, abi_long arg3,
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abi_long arg4, abi_long arg5, abi_long arg6);
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void print_freebsd_syscall_ret(int num, abi_long ret);
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void
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print_netbsd_syscall(int num,
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abi_long arg1, abi_long arg2, abi_long arg3,
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abi_long arg4, abi_long arg5, abi_long arg6);
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void print_netbsd_syscall_ret(int num, abi_long ret);
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void
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print_openbsd_syscall(int num,
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abi_long arg1, abi_long arg2, abi_long arg3,
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abi_long arg4, abi_long arg5, abi_long arg6);
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void print_openbsd_syscall_ret(int num, abi_long ret);
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/**
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* print_taken_signal:
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* @target_signum: target signal being taken
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* @tinfo: target_siginfo_t which will be passed to the guest for the signal
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*
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* Print strace output indicating that this signal is being taken by the guest,
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* in a format similar to:
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* --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
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*/
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void print_taken_signal(int target_signum, const target_siginfo_t *tinfo);
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extern int do_strace;
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/* mmap.c */
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int target_mprotect(abi_ulong start, abi_ulong len, int prot);
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abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
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int flags, int fd, off_t offset);
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int target_munmap(abi_ulong start, abi_ulong len);
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abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
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abi_ulong new_size, unsigned long flags,
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abi_ulong new_addr);
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int target_msync(abi_ulong start, abi_ulong len, int flags);
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extern abi_ulong mmap_next_start;
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abi_ulong mmap_find_vma(abi_ulong start, abi_ulong size);
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void mmap_reserve(abi_ulong start, abi_ulong size);
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void TSA_NO_TSA mmap_fork_start(void);
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void TSA_NO_TSA mmap_fork_end(int child);
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/* main.c */
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extern char qemu_proc_pathname[];
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extern unsigned long target_maxtsiz;
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extern unsigned long target_dfldsiz;
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extern unsigned long target_maxdsiz;
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extern unsigned long target_dflssiz;
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extern unsigned long target_maxssiz;
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extern unsigned long target_sgrowsiz;
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/* os-syscall.c */
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abi_long get_errno(abi_long ret);
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bool is_error(abi_long ret);
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int host_to_target_errno(int err);
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/* os-proc.c */
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abi_long freebsd_exec_common(abi_ulong path_or_fd, abi_ulong guest_argp,
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abi_ulong guest_envp, int do_fexec);
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abi_long do_freebsd_procctl(void *cpu_env, int idtype, abi_ulong arg2,
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abi_ulong arg3, abi_ulong arg4, abi_ulong arg5, abi_ulong arg6);
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/* os-sys.c */
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abi_long do_freebsd_sysctl(CPUArchState *env, abi_ulong namep, int32_t namelen,
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abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp, abi_ulong newlen);
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abi_long do_freebsd_sysctlbyname(CPUArchState *env, abi_ulong namep,
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int32_t namelen, abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp,
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abi_ulong newlen);
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abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2);
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/* user access */
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#define VERIFY_READ PAGE_READ
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#define VERIFY_WRITE (PAGE_READ | PAGE_WRITE)
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static inline bool access_ok(int type, abi_ulong addr, abi_ulong size)
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{
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return page_check_range((target_ulong)addr, size, type);
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}
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/*
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* NOTE __get_user and __put_user use host pointers and don't check access.
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*
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* These are usually used to access struct data members once the struct has been
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* locked - usually with lock_user_struct().
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*/
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/*
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* Tricky points:
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* - Use __builtin_choose_expr to avoid type promotion from ?:,
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* - Invalid sizes result in a compile time error stemming from
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* the fact that abort has no parameters.
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* - It's easier to use the endian-specific unaligned load/store
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* functions than host-endian unaligned load/store plus tswapN.
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* - The pragmas are necessary only to silence a clang false-positive
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* warning: see https://bugs.llvm.org/show_bug.cgi?id=39113 .
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* - gcc has bugs in its _Pragma() support in some versions, eg
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* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83256 -- so we only
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* include the warning-suppression pragmas for clang
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*/
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#if defined(__clang__) && __has_warning("-Waddress-of-packed-member")
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#define PRAGMA_DISABLE_PACKED_WARNING \
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_Pragma("GCC diagnostic push"); \
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_Pragma("GCC diagnostic ignored \"-Waddress-of-packed-member\"")
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#define PRAGMA_REENABLE_PACKED_WARNING \
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_Pragma("GCC diagnostic pop")
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#else
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#define PRAGMA_DISABLE_PACKED_WARNING
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#define PRAGMA_REENABLE_PACKED_WARNING
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#endif
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#define __put_user_e(x, hptr, e) \
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do { \
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PRAGMA_DISABLE_PACKED_WARNING; \
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(__builtin_choose_expr(sizeof(*(hptr)) == 1, stb_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 2, stw_##e##_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 4, stl_##e##_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 8, stq_##e##_p, abort)))) \
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((hptr), (x)), (void)0); \
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PRAGMA_REENABLE_PACKED_WARNING; \
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} while (0)
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#define __get_user_e(x, hptr, e) \
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do { \
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PRAGMA_DISABLE_PACKED_WARNING; \
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((x) = (typeof(*hptr))( \
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__builtin_choose_expr(sizeof(*(hptr)) == 1, ldub_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 2, lduw_##e##_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 4, ldl_##e##_p, \
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__builtin_choose_expr(sizeof(*(hptr)) == 8, ldq_##e##_p, abort)))) \
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(hptr)), (void)0); \
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PRAGMA_REENABLE_PACKED_WARNING; \
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} while (0)
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#if TARGET_BIG_ENDIAN
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# define __put_user(x, hptr) __put_user_e(x, hptr, be)
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# define __get_user(x, hptr) __get_user_e(x, hptr, be)
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#else
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# define __put_user(x, hptr) __put_user_e(x, hptr, le)
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# define __get_user(x, hptr) __get_user_e(x, hptr, le)
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#endif
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/*
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* put_user()/get_user() take a guest address and check access
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*
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* These are usually used to access an atomic data type, such as an int, that
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* has been passed by address. These internally perform locking and unlocking
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* on the data type.
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*/
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#define put_user(x, gaddr, target_type) \
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({ \
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abi_ulong __gaddr = (gaddr); \
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target_type *__hptr; \
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abi_long __ret = 0; \
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__hptr = lock_user(VERIFY_WRITE, __gaddr, sizeof(target_type), 0); \
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if (__hptr) { \
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__put_user((x), __hptr); \
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unlock_user(__hptr, __gaddr, sizeof(target_type)); \
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} else \
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__ret = -TARGET_EFAULT; \
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__ret; \
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})
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#define get_user(x, gaddr, target_type) \
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({ \
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abi_ulong __gaddr = (gaddr); \
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target_type *__hptr; \
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abi_long __ret = 0; \
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__hptr = lock_user(VERIFY_READ, __gaddr, sizeof(target_type), 1); \
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if (__hptr) { \
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__get_user((x), __hptr); \
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unlock_user(__hptr, __gaddr, 0); \
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} else { \
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(x) = 0; \
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__ret = -TARGET_EFAULT; \
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} \
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__ret; \
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})
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#define put_user_ual(x, gaddr) put_user((x), (gaddr), abi_ulong)
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#define put_user_sal(x, gaddr) put_user((x), (gaddr), abi_long)
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#define put_user_u64(x, gaddr) put_user((x), (gaddr), uint64_t)
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#define put_user_s64(x, gaddr) put_user((x), (gaddr), int64_t)
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#define put_user_u32(x, gaddr) put_user((x), (gaddr), uint32_t)
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#define put_user_s32(x, gaddr) put_user((x), (gaddr), int32_t)
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#define put_user_u16(x, gaddr) put_user((x), (gaddr), uint16_t)
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#define put_user_s16(x, gaddr) put_user((x), (gaddr), int16_t)
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#define put_user_u8(x, gaddr) put_user((x), (gaddr), uint8_t)
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#define put_user_s8(x, gaddr) put_user((x), (gaddr), int8_t)
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#define get_user_ual(x, gaddr) get_user((x), (gaddr), abi_ulong)
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#define get_user_sal(x, gaddr) get_user((x), (gaddr), abi_long)
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#define get_user_u64(x, gaddr) get_user((x), (gaddr), uint64_t)
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#define get_user_s64(x, gaddr) get_user((x), (gaddr), int64_t)
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#define get_user_u32(x, gaddr) get_user((x), (gaddr), uint32_t)
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#define get_user_s32(x, gaddr) get_user((x), (gaddr), int32_t)
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#define get_user_u16(x, gaddr) get_user((x), (gaddr), uint16_t)
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#define get_user_s16(x, gaddr) get_user((x), (gaddr), int16_t)
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#define get_user_u8(x, gaddr) get_user((x), (gaddr), uint8_t)
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#define get_user_s8(x, gaddr) get_user((x), (gaddr), int8_t)
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/*
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* copy_from_user() and copy_to_user() are usually used to copy data
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* buffers between the target and host. These internally perform
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* locking/unlocking of the memory.
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*/
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abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
|
|
abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
|
|
|
|
/*
|
|
* Functions for accessing guest memory. The tget and tput functions
|
|
* read/write single values, byteswapping as necessary. The lock_user function
|
|
* gets a pointer to a contiguous area of guest memory, but does not perform
|
|
* any byteswapping. lock_user may return either a pointer to the guest
|
|
* memory, or a temporary buffer.
|
|
*/
|
|
|
|
/*
|
|
* Lock an area of guest memory into the host. If copy is true then the
|
|
* host area will have the same contents as the guest.
|
|
*/
|
|
static inline void *lock_user(int type, abi_ulong guest_addr, long len,
|
|
int copy)
|
|
{
|
|
if (!access_ok(type, guest_addr, len)) {
|
|
return NULL;
|
|
}
|
|
#ifdef CONFIG_DEBUG_REMAP
|
|
{
|
|
void *addr;
|
|
addr = g_malloc(len);
|
|
if (copy) {
|
|
memcpy(addr, g2h_untagged(guest_addr), len);
|
|
} else {
|
|
memset(addr, 0, len);
|
|
}
|
|
return addr;
|
|
}
|
|
#else
|
|
return g2h_untagged(guest_addr);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Unlock an area of guest memory. The first LEN bytes must be flushed back to
|
|
* guest memory. host_ptr = NULL is explicitly allowed and does nothing.
|
|
*/
|
|
static inline void unlock_user(void *host_ptr, abi_ulong guest_addr,
|
|
long len)
|
|
{
|
|
|
|
#ifdef CONFIG_DEBUG_REMAP
|
|
if (!host_ptr) {
|
|
return;
|
|
}
|
|
if (host_ptr == g2h_untagged(guest_addr)) {
|
|
return;
|
|
}
|
|
if (len > 0) {
|
|
memcpy(g2h_untagged(guest_addr), host_ptr, len);
|
|
}
|
|
g_free(host_ptr);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Return the length of a string in target memory or -TARGET_EFAULT if access
|
|
* error.
|
|
*/
|
|
abi_long target_strlen(abi_ulong gaddr);
|
|
|
|
/* Like lock_user but for null terminated strings. */
|
|
static inline void *lock_user_string(abi_ulong guest_addr)
|
|
{
|
|
abi_long len;
|
|
len = target_strlen(guest_addr);
|
|
if (len < 0) {
|
|
return NULL;
|
|
}
|
|
return lock_user(VERIFY_READ, guest_addr, (long)(len + 1), 1);
|
|
}
|
|
|
|
/* Helper macros for locking/unlocking a target struct. */
|
|
#define lock_user_struct(type, host_ptr, guest_addr, copy) \
|
|
(host_ptr = lock_user(type, guest_addr, sizeof(*host_ptr), copy))
|
|
#define unlock_user_struct(host_ptr, guest_addr, copy) \
|
|
unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
|
|
|
|
static inline uint64_t target_arg64(uint32_t word0, uint32_t word1)
|
|
{
|
|
#if TARGET_ABI_BITS == 32
|
|
#if TARGET_BIG_ENDIAN
|
|
return ((uint64_t)word0 << 32) | word1;
|
|
#else
|
|
return ((uint64_t)word1 << 32) | word0;
|
|
#endif
|
|
#else /* TARGET_ABI_BITS != 32 */
|
|
return word0;
|
|
#endif /* TARGET_ABI_BITS != 32 */
|
|
}
|
|
|
|
#include <pthread.h>
|
|
|
|
#include "user/safe-syscall.h"
|
|
|
|
#endif /* QEMU_H */
|