* linux-arm-low.c: Include <signal.h>.
(PTRACE_GETHBPREGS, PTRACE_SETHBPREGS): Define if necessary. (struct arm_linux_hwbp_cap): New data type. (arm_hwbp_type, arm_hwbp_control_t): New typedefs. (struct arm_linux_hw_breakpoint): New data type. (MAX_BPTS, MAX_WPTS): Define. (struct arch_process_info, struct arch_lwp_info): New data types. (arm_linux_get_hwbp_cap): New function. (arm_linux_get_hw_breakpoint_count): Likewise. (arm_linux_get_hw_watchpoint_count): Likewise. (arm_linux_get_hw_watchpoint_max_length): Likewise. (arm_hwbp_control_initialize): Likewise. (arm_hwbp_control_is_enabled): Likewise. (arm_hwbp_control_is_initialized): Likewise. (arm_hwbp_control_disable): Likewise. (arm_linux_hw_breakpoint_equal): Likewise. (arm_linux_hw_point_initialize): Likewise. (struct update_registers_data): New data structure. (update_registers_callback: New function. (arm_insert_point): Likewise. (arm_remove_point): Likewise. (arm_stopped_by_watchpoint): Likewise. (arm_stopped_data_address): Likewise. (arm_new_process): Likewise. (arm_new_thread): Likewise. (arm_prepare_to_resume): Likewise. (the_low_target): Register arm_insert_point, arm_remove_point, arm_stopped_by_watchpoint, arm_stopped_data_address, arm_new_process, arm_new_thread, and arm_prepare_to_resume.
This commit is contained in:
Ulrich Weigand
parent
7ba695a99c
commit
09b4ad9fcb
2 changed files with 527 additions and 0 deletions
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@ -1,3 +1,35 @@
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2011-11-15 Ulrich Weigand <ulrich.weigand@linaro.org>
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* linux-arm-low.c: Include <signal.h>.
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(PTRACE_GETHBPREGS, PTRACE_SETHBPREGS): Define if necessary.
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(struct arm_linux_hwbp_cap): New data type.
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(arm_hwbp_type, arm_hwbp_control_t): New typedefs.
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(struct arm_linux_hw_breakpoint): New data type.
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(MAX_BPTS, MAX_WPTS): Define.
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(struct arch_process_info, struct arch_lwp_info): New data types.
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(arm_linux_get_hwbp_cap): New function.
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(arm_linux_get_hw_breakpoint_count): Likewise.
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(arm_linux_get_hw_watchpoint_count): Likewise.
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(arm_linux_get_hw_watchpoint_max_length): Likewise.
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(arm_hwbp_control_initialize): Likewise.
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(arm_hwbp_control_is_enabled): Likewise.
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(arm_hwbp_control_is_initialized): Likewise.
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(arm_hwbp_control_disable): Likewise.
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(arm_linux_hw_breakpoint_equal): Likewise.
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(arm_linux_hw_point_initialize): Likewise.
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(struct update_registers_data): New data structure.
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(update_registers_callback: New function.
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(arm_insert_point): Likewise.
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(arm_remove_point): Likewise.
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(arm_stopped_by_watchpoint): Likewise.
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(arm_stopped_data_address): Likewise.
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(arm_new_process): Likewise.
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(arm_new_thread): Likewise.
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(arm_prepare_to_resume): Likewise.
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(the_low_target): Register arm_insert_point, arm_remove_point,
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arm_stopped_by_watchpoint, arm_stopped_data_address, arm_new_process,
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arm_new_thread, and arm_prepare_to_resume.
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2011-09-15 Stan Shebs <stan@codesourcery.com>
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* server.h (struct emit_ops): Add compare-goto fields.
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@ -26,6 +26,7 @@
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#include <elf.h>
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#endif
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#include <sys/ptrace.h>
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#include <signal.h>
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/* Defined in auto-generated files. */
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void init_registers_arm (void);
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@ -48,6 +49,65 @@ void init_registers_arm_with_neon (void);
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# define PTRACE_SETVFPREGS 28
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#endif
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#ifndef PTRACE_GETHBPREGS
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#define PTRACE_GETHBPREGS 29
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#define PTRACE_SETHBPREGS 30
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#endif
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/* Information describing the hardware breakpoint capabilities. */
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struct arm_linux_hwbp_cap
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{
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unsigned char arch;
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unsigned char max_wp_length;
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unsigned char wp_count;
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unsigned char bp_count;
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};
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/* Enum describing the different types of ARM hardware break-/watch-points. */
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typedef enum
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{
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arm_hwbp_break = 0,
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arm_hwbp_load = 1,
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arm_hwbp_store = 2,
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arm_hwbp_access = 3
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} arm_hwbp_type;
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/* Type describing an ARM Hardware Breakpoint Control register value. */
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typedef unsigned int arm_hwbp_control_t;
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/* Structure used to keep track of hardware break-/watch-points. */
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struct arm_linux_hw_breakpoint
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{
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/* Address to break on, or being watched. */
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unsigned int address;
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/* Control register for break-/watch- point. */
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arm_hwbp_control_t control;
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};
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/* Since we cannot dynamically allocate subfields of arch_process_info,
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assume a maximum number of supported break-/watchpoints. */
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#define MAX_BPTS 32
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#define MAX_WPTS 32
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/* Per-process arch-specific data we want to keep. */
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struct arch_process_info
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{
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/* Hardware breakpoints for this process. */
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struct arm_linux_hw_breakpoint bpts[MAX_BPTS];
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/* Hardware watchpoints for this process. */
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struct arm_linux_hw_breakpoint wpts[MAX_WPTS];
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};
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/* Per-thread arch-specific data we want to keep. */
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struct arch_lwp_info
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{
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/* Non-zero if our copy differs from what's recorded in the thread. */
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char bpts_changed[MAX_BPTS];
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char wpts_changed[MAX_WPTS];
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/* Cached stopped data address. */
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CORE_ADDR stopped_data_address;
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};
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static unsigned long arm_hwcap;
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/* These are in <asm/elf.h> in current kernels. */
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@ -280,6 +340,431 @@ ps_get_thread_area (const struct ps_prochandle *ph,
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return PS_OK;
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}
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/* Get hold of the Hardware Breakpoint information for the target we are
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attached to. Returns NULL if the kernel doesn't support Hardware
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breakpoints at all, or a pointer to the information structure. */
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static const struct arm_linux_hwbp_cap *
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arm_linux_get_hwbp_cap (void)
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{
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/* The info structure we return. */
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static struct arm_linux_hwbp_cap info;
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/* Is INFO in a good state? -1 means that no attempt has been made to
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initialize INFO; 0 means an attempt has been made, but it failed; 1
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means INFO is in an initialized state. */
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static int available = -1;
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if (available == -1)
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{
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int pid = lwpid_of (get_thread_lwp (current_inferior));
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unsigned int val;
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if (ptrace (PTRACE_GETHBPREGS, pid, 0, &val) < 0)
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available = 0;
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else
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{
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info.arch = (unsigned char)((val >> 24) & 0xff);
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info.max_wp_length = (unsigned char)((val >> 16) & 0xff);
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info.wp_count = (unsigned char)((val >> 8) & 0xff);
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info.bp_count = (unsigned char)(val & 0xff);
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available = (info.arch != 0);
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}
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if (available)
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{
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if (info.wp_count > MAX_WPTS)
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internal_error (__FILE__, __LINE__,
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"Unsupported number of watchpoints");
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if (info.bp_count > MAX_BPTS)
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internal_error (__FILE__, __LINE__,
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"Unsupported number of breakpoints");
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}
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}
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return available == 1 ? &info : NULL;
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}
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/* How many hardware breakpoints are available? */
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static int
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arm_linux_get_hw_breakpoint_count (void)
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{
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const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
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return cap != NULL ? cap->bp_count : 0;
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}
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/* How many hardware watchpoints are available? */
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static int
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arm_linux_get_hw_watchpoint_count (void)
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{
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const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
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return cap != NULL ? cap->wp_count : 0;
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}
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/* Maximum length of area watched by hardware watchpoint. */
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static int
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arm_linux_get_hw_watchpoint_max_length (void)
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{
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const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
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return cap != NULL ? cap->max_wp_length : 0;
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}
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/* Initialize an ARM hardware break-/watch-point control register value.
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BYTE_ADDRESS_SELECT is the mask of bytes to trigger on; HWBP_TYPE is the
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type of break-/watch-point; ENABLE indicates whether the point is enabled.
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*/
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static arm_hwbp_control_t
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arm_hwbp_control_initialize (unsigned byte_address_select,
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arm_hwbp_type hwbp_type,
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int enable)
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{
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gdb_assert ((byte_address_select & ~0xffU) == 0);
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gdb_assert (hwbp_type != arm_hwbp_break
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|| ((byte_address_select & 0xfU) != 0));
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return (byte_address_select << 5) | (hwbp_type << 3) | (3 << 1) | enable;
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}
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/* Does the breakpoint control value CONTROL have the enable bit set? */
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static int
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arm_hwbp_control_is_enabled (arm_hwbp_control_t control)
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{
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return control & 0x1;
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}
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/* Is the breakpoint control value CONTROL initialized? */
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static int
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arm_hwbp_control_is_initialized (arm_hwbp_control_t control)
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{
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return control != 0;
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}
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/* Change a breakpoint control word so that it is in the disabled state. */
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static arm_hwbp_control_t
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arm_hwbp_control_disable (arm_hwbp_control_t control)
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{
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return control & ~0x1;
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}
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/* Are two break-/watch-points equal? */
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static int
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arm_linux_hw_breakpoint_equal (const struct arm_linux_hw_breakpoint *p1,
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const struct arm_linux_hw_breakpoint *p2)
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{
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return p1->address == p2->address && p1->control == p2->control;
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}
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/* Initialize the hardware breakpoint structure P for a breakpoint or
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watchpoint at ADDR to LEN. The type of watchpoint is given in TYPE.
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Returns -1 if TYPE is unsupported, 0 if TYPE represents a breakpoint,
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and 1 if type represents a watchpoint. */
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static int
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arm_linux_hw_point_initialize (char type, CORE_ADDR addr, int len,
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struct arm_linux_hw_breakpoint *p)
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{
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arm_hwbp_type hwbp_type;
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unsigned mask;
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/* Breakpoint/watchpoint types (GDB terminology):
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0 = memory breakpoint for instructions
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(not supported; done via memory write instead)
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1 = hardware breakpoint for instructions (supported)
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2 = write watchpoint (supported)
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3 = read watchpoint (supported)
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4 = access watchpoint (supported). */
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switch (type)
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{
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case '1':
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hwbp_type = arm_hwbp_break;
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break;
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case '2':
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hwbp_type = arm_hwbp_store;
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break;
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case '3':
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hwbp_type = arm_hwbp_load;
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break;
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case '4':
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hwbp_type = arm_hwbp_access;
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break;
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default:
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/* Unsupported. */
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return -1;
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}
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if (hwbp_type == arm_hwbp_break)
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{
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/* For breakpoints, the length field encodes the mode. */
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switch (len)
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{
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case 2: /* 16-bit Thumb mode breakpoint */
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case 3: /* 32-bit Thumb mode breakpoint */
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mask = 0x3 << (addr & 2);
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break;
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case 4: /* 32-bit ARM mode breakpoint */
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mask = 0xf;
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break;
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default:
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/* Unsupported. */
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return -1;
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}
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addr &= ~3;
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}
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else
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{
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CORE_ADDR max_wp_length = arm_linux_get_hw_watchpoint_max_length ();
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CORE_ADDR aligned_addr;
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/* Can not set watchpoints for zero or negative lengths. */
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if (len <= 0)
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return -1;
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/* The current ptrace interface can only handle watchpoints that are a
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power of 2. */
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if ((len & (len - 1)) != 0)
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return -1;
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/* Test that the range [ADDR, ADDR + LEN) fits into the largest address
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range covered by a watchpoint. */
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aligned_addr = addr & ~(max_wp_length - 1);
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if (aligned_addr + max_wp_length < addr + len)
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return -1;
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mask = (1 << len) - 1;
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}
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p->address = (unsigned int) addr;
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p->control = arm_hwbp_control_initialize (mask, hwbp_type, 1);
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return hwbp_type != arm_hwbp_break;
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}
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/* Callback to mark a watch-/breakpoint to be updated in all threads of
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the current process. */
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struct update_registers_data
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{
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int watch;
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int i;
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};
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static int
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update_registers_callback (struct inferior_list_entry *entry, void *arg)
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{
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struct lwp_info *lwp = (struct lwp_info *) entry;
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struct update_registers_data *data = (struct update_registers_data *) arg;
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/* Only update the threads of the current process. */
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if (pid_of (lwp) == pid_of (get_thread_lwp (current_inferior)))
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{
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/* The actual update is done later just before resuming the lwp,
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we just mark that the registers need updating. */
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if (data->watch)
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lwp->arch_private->wpts_changed[data->i] = 1;
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else
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lwp->arch_private->bpts_changed[data->i] = 1;
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/* If the lwp isn't stopped, force it to momentarily pause, so
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we can update its breakpoint registers. */
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if (!lwp->stopped)
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linux_stop_lwp (lwp);
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}
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return 0;
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}
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/* Insert hardware break-/watchpoint. */
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static int
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arm_insert_point (char type, CORE_ADDR addr, int len)
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{
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struct process_info *proc = current_process ();
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struct arm_linux_hw_breakpoint p, *pts;
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int watch, i, count;
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watch = arm_linux_hw_point_initialize (type, addr, len, &p);
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if (watch < 0)
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{
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/* Unsupported. */
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return 1;
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}
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if (watch)
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{
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count = arm_linux_get_hw_watchpoint_count ();
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pts = proc->private->arch_private->wpts;
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}
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else
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{
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count = arm_linux_get_hw_breakpoint_count ();
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pts = proc->private->arch_private->bpts;
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}
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for (i = 0; i < count; i++)
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if (!arm_hwbp_control_is_enabled (pts[i].control))
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{
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struct update_registers_data data = { watch, i };
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pts[i] = p;
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find_inferior (&all_lwps, update_registers_callback, &data);
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return 0;
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}
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/* We're out of watchpoints. */
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return -1;
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}
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/* Remove hardware break-/watchpoint. */
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static int
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arm_remove_point (char type, CORE_ADDR addr, int len)
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{
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struct process_info *proc = current_process ();
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struct arm_linux_hw_breakpoint p, *pts;
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int watch, i, count;
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watch = arm_linux_hw_point_initialize (type, addr, len, &p);
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if (watch < 0)
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{
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/* Unsupported. */
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return -1;
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}
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|
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if (watch)
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{
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count = arm_linux_get_hw_watchpoint_count ();
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pts = proc->private->arch_private->wpts;
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}
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else
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{
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count = arm_linux_get_hw_breakpoint_count ();
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pts = proc->private->arch_private->bpts;
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}
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for (i = 0; i < count; i++)
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if (arm_linux_hw_breakpoint_equal (&p, pts + i))
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{
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struct update_registers_data data = { watch, i };
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pts[i].control = arm_hwbp_control_disable (pts[i].control);
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find_inferior (&all_lwps, update_registers_callback, &data);
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return 0;
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}
|
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|
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/* No watchpoint matched. */
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return -1;
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}
|
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|
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/* Return whether current thread is stopped due to a watchpoint. */
|
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static int
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arm_stopped_by_watchpoint (void)
|
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{
|
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struct lwp_info *lwp = get_thread_lwp (current_inferior);
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struct siginfo siginfo;
|
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|
||||
/* We must be able to set hardware watchpoints. */
|
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if (arm_linux_get_hw_watchpoint_count () == 0)
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return 0;
|
||||
|
||||
/* Retrieve siginfo. */
|
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errno = 0;
|
||||
ptrace (PTRACE_GETSIGINFO, lwpid_of (lwp), 0, &siginfo);
|
||||
if (errno != 0)
|
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return 0;
|
||||
|
||||
/* This must be a hardware breakpoint. */
|
||||
if (siginfo.si_signo != SIGTRAP
|
||||
|| (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */)
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return 0;
|
||||
|
||||
/* If we are in a positive slot then we're looking at a breakpoint and not
|
||||
a watchpoint. */
|
||||
if (siginfo.si_errno >= 0)
|
||||
return 0;
|
||||
|
||||
/* Cache stopped data address for use by arm_stopped_data_address. */
|
||||
lwp->arch_private->stopped_data_address
|
||||
= (CORE_ADDR) (uintptr_t) siginfo.si_addr;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/* Return data address that triggered watchpoint. Called only if
|
||||
arm_stopped_by_watchpoint returned true. */
|
||||
static CORE_ADDR
|
||||
arm_stopped_data_address (void)
|
||||
{
|
||||
struct lwp_info *lwp = get_thread_lwp (current_inferior);
|
||||
return lwp->arch_private->stopped_data_address;
|
||||
}
|
||||
|
||||
/* Called when a new process is created. */
|
||||
static struct arch_process_info *
|
||||
arm_new_process (void)
|
||||
{
|
||||
struct arch_process_info *info = xcalloc (1, sizeof (*info));
|
||||
return info;
|
||||
}
|
||||
|
||||
/* Called when a new thread is detected. */
|
||||
static struct arch_lwp_info *
|
||||
arm_new_thread (void)
|
||||
{
|
||||
struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
|
||||
int i;
|
||||
|
||||
for (i = 0; i < MAX_BPTS; i++)
|
||||
info->bpts_changed[i] = 1;
|
||||
for (i = 0; i < MAX_WPTS; i++)
|
||||
info->wpts_changed[i] = 1;
|
||||
|
||||
return info;
|
||||
}
|
||||
|
||||
/* Called when resuming a thread.
|
||||
If the debug regs have changed, update the thread's copies. */
|
||||
static void
|
||||
arm_prepare_to_resume (struct lwp_info *lwp)
|
||||
{
|
||||
int pid = lwpid_of (lwp);
|
||||
struct process_info *proc = find_process_pid (pid_of (lwp));
|
||||
struct arch_process_info *proc_info = proc->private->arch_private;
|
||||
struct arch_lwp_info *lwp_info = lwp->arch_private;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < arm_linux_get_hw_breakpoint_count (); i++)
|
||||
if (lwp_info->bpts_changed[i])
|
||||
{
|
||||
errno = 0;
|
||||
|
||||
if (arm_hwbp_control_is_enabled (proc_info->bpts[i].control))
|
||||
if (ptrace (PTRACE_SETHBPREGS, pid, ((i << 1) + 1),
|
||||
&proc_info->bpts[i].address) < 0)
|
||||
error (_("Unexpected error setting breakpoint address"));
|
||||
|
||||
if (arm_hwbp_control_is_initialized (proc_info->bpts[i].control))
|
||||
if (ptrace (PTRACE_SETHBPREGS, pid, ((i << 1) + 2),
|
||||
&proc_info->bpts[i].control) < 0)
|
||||
error (_("Unexpected error setting breakpoint"));
|
||||
|
||||
lwp_info->bpts_changed[i] = 0;
|
||||
}
|
||||
|
||||
for (i = 0; i < arm_linux_get_hw_watchpoint_count (); i++)
|
||||
if (lwp_info->wpts_changed[i])
|
||||
{
|
||||
errno = 0;
|
||||
|
||||
if (arm_hwbp_control_is_enabled (proc_info->wpts[i].control))
|
||||
if (ptrace (PTRACE_SETHBPREGS, pid, -((i << 1) + 1),
|
||||
&proc_info->wpts[i].address) < 0)
|
||||
error (_("Unexpected error setting watchpoint address"));
|
||||
|
||||
if (arm_hwbp_control_is_initialized (proc_info->wpts[i].control))
|
||||
if (ptrace (PTRACE_SETHBPREGS, pid, -((i << 1) + 2),
|
||||
&proc_info->wpts[i].control) < 0)
|
||||
error (_("Unexpected error setting watchpoint"));
|
||||
|
||||
lwp_info->wpts_changed[i] = 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
static int
|
||||
arm_get_hwcap (unsigned long *valp)
|
||||
{
|
||||
|
|
@ -389,4 +874,14 @@ struct linux_target_ops the_low_target = {
|
|||
arm_reinsert_addr,
|
||||
0,
|
||||
arm_breakpoint_at,
|
||||
arm_insert_point,
|
||||
arm_remove_point,
|
||||
arm_stopped_by_watchpoint,
|
||||
arm_stopped_data_address,
|
||||
NULL, /* collect_ptrace_register */
|
||||
NULL, /* supply_ptrace_register */
|
||||
NULL, /* siginfo_fixup */
|
||||
arm_new_process,
|
||||
arm_new_thread,
|
||||
arm_prepare_to_resume,
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in a new issue