diff options
Diffstat (limited to 'gdb/x86-64-linux-nat.c')
| -rw-r--r-- | gdb/x86-64-linux-nat.c | 166 |
1 files changed, 7 insertions, 159 deletions
diff --git a/gdb/x86-64-linux-nat.c b/gdb/x86-64-linux-nat.c index 596e393..fd70572 100644 --- a/gdb/x86-64-linux-nat.c +++ b/gdb/x86-64-linux-nat.c @@ -128,8 +128,6 @@ x86_64_linux_dr_get_status (void) (0 <= (regno) && (regno) < x86_64_num_gregs) #define GETFPREGS_SUPPLIES(regno) \ (FP0_REGNUM <= (regno) && (regno) <= MXCSR_REGNUM) - -#define PTRACE_XFER_TYPE unsigned long /* Transfering the general-purpose registers between GDB, inferiors @@ -344,164 +342,7 @@ static const unsigned char linux_syscall[] = { 0x0f, 0x05 }; /* Offset to saved processor registers from <asm/ucontext.h> */ #define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36) -/* Resume execution of the inferior process. - If STEP is nonzero, single-step it. - If SIGNAL is nonzero, give it that signal. */ - -void -child_resume (ptid_t ptid, int step, enum target_signal signal) -{ - int pid = PIDGET (ptid); - int request = PTRACE_CONT; - - if (pid == -1) - /* Resume all threads. */ - /* I think this only gets used in the non-threaded case, where "resume - all threads" and "resume inferior_ptid" are the same. */ - pid = PIDGET (inferior_ptid); - - if (step) - { - CORE_ADDR pc = read_pc_pid (pid_to_ptid (pid)); - unsigned char buf[LINUX_SYSCALL_LEN]; - - request = PTRACE_SINGLESTEP; - - /* Returning from a signal trampoline is done by calling a - special system call (sigreturn or rt_sigreturn, see - i386-linux-tdep.c for more information). This system call - restores the registers that were saved when the signal was - raised, including %eflags. That means that single-stepping - won't work. Instead, we'll have to modify the signal context - that's about to be restored, and set the trace flag there. */ - - /* First check if PC is at a system call. */ - if (read_memory_nobpt (pc, (char *) buf, LINUX_SYSCALL_LEN) == 0 - && memcmp (buf, linux_syscall, LINUX_SYSCALL_LEN) == 0) - { - int syscall = - read_register_pid (LINUX_SYSCALL_REGNUM, pid_to_ptid (pid)); - - /* Then check the system call number. */ - if (syscall == SYS_rt_sigreturn) - { - CORE_ADDR sp = read_register (SP_REGNUM); - CORE_ADDR addr = sp; - unsigned long int eflags; - - addr += - sizeof (struct siginfo) + LINUX_UCONTEXT_SIGCONTEXT_OFFSET; - - /* Set the trace flag in the context that's about to be - restored. */ - addr += LINUX_SIGCONTEXT_EFLAGS_OFFSET; - read_memory (addr, (char *) &eflags, 8); - eflags |= 0x0100; - write_memory (addr, (char *) &eflags, 8); - } - } - } - - if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1) - perror_with_name ("ptrace"); -} - - -/* Copy LEN bytes to or from inferior's memory starting at MEMADDR - to debugger memory starting at MYADDR. Copy to inferior if - WRITE is nonzero. TARGET is ignored. - - Returns the length copied, which is either the LEN argument or zero. - This xfer function does not do partial moves, since child_ops - doesn't allow memory operations to cross below us in the target stack - anyway. */ - -int -child_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int write, - struct mem_attrib *attrib, struct target_ops *target) -{ - register int i; - /* Round starting address down to longword boundary. */ - register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE); - /* Round ending address up; get number of longwords that makes. */ - register int count - = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) - / sizeof (PTRACE_XFER_TYPE); - /* Allocate buffer of that many longwords. */ - /* FIXME (alloca): This code, cloned from infptrace.c, is unsafe - because it uses alloca to allocate a buffer of arbitrary size. - For very large xfers, this could crash GDB's stack. */ - register PTRACE_XFER_TYPE *buffer - = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE)); - - if (write) - { - /* Fill start and end extra bytes of buffer with existing memory data. */ - if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE)) - { - /* Need part of initial word -- fetch it. */ - buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_ptid), - (PTRACE_ARG3_TYPE) addr, 0); - } - - if (count > 1) /* FIXME, avoid if even boundary */ - { - buffer[count - 1] = ptrace (PT_READ_I, PIDGET (inferior_ptid), - ((PTRACE_ARG3_TYPE) - (addr + - (count - - 1) * sizeof (PTRACE_XFER_TYPE))), 0); - } - - /* Copy data to be written over corresponding part of buffer */ - - memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), - myaddr, len); - - /* Write the entire buffer. */ - - for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) - { - errno = 0; - ptrace (PT_WRITE_D, PIDGET (inferior_ptid), - (PTRACE_ARG3_TYPE) addr, buffer[i]); - if (errno) - { - /* Using the appropriate one (I or D) is necessary for - Gould NP1, at least. */ - errno = 0; - ptrace (PT_WRITE_I, PIDGET (inferior_ptid), - (PTRACE_ARG3_TYPE) addr, buffer[i]); - } - if (errno) - return 0; - } -#ifdef CLEAR_INSN_CACHE - CLEAR_INSN_CACHE (); -#endif - } - else - { - /* Read all the longwords */ - for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE)) - { - errno = 0; - buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_ptid), - (PTRACE_ARG3_TYPE) addr, 0); - if (errno) - return 0; - } - - /* Copy appropriate bytes out of the buffer. */ - memcpy (myaddr, - (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), - len); - } - return len; -} - /* Interpreting register set info found in core files. */ - /* Provide registers to GDB from a core file. CORE_REG_SECT points to an array of bytes, which are the contents @@ -599,3 +440,10 @@ _initialize_x86_64_linux_nat (void) { add_core_fns (&linux_elf_core_fns); } + +int +kernel_u_size (void) +{ + return (sizeof (struct user)); +} + |