/* GNU/Linux/AArch64 specific low level interface, for the remote server for
GDB.
- Copyright (C) 2009-2014 Free Software Foundation, Inc.
+ Copyright (C) 2009-2015 Free Software Foundation, Inc.
Contributed by ARM Ltd.
This file is part of GDB.
#include "server.h"
#include "linux-low.h"
+#include "nat/aarch64-linux.h"
+#include "nat/aarch64-linux-hw-point.h"
+#include "linux-aarch32-low.h"
#include "elf/common.h"
#include <signal.h>
#include <sys/user.h>
-#include <sys/ptrace.h>
+#include "nat/gdb_ptrace.h"
#include <asm/ptrace.h>
#include <sys/uio.h>
#define AARCH64_NUM_REGS (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM + 2)
-static int
-aarch64_regmap [] =
-{
- /* These offsets correspond to GET/SETREGSET */
- /* x0... */
- 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8,
- 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8,
- 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8,
- 24*8, 25*8, 26*8, 27*8, 28*8,
- 29*8,
- 30*8, /* x30 lr */
- 31*8, /* x31 sp */
- 32*8, /* pc */
- 33*8, /* cpsr 4 bytes!*/
-
- /* FP register offsets correspond to GET/SETFPREGSET */
- 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16,
- 8*16, 9*16, 10*16, 11*16, 12*16, 13*16, 14*16, 15*16,
- 16*16, 17*16, 18*16, 19*16, 20*16, 21*16, 22*16, 23*16,
- 24*16, 25*16, 26*16, 27*16, 28*16, 29*16, 30*16, 31*16
-};
-
-/* Here starts the macro definitions, data structures, and code for
- the hardware breakpoint and hardware watchpoint support. The
- following is the abbreviations that are used frequently in the code
- and comment:
-
- hw - hardware
- bp - breakpoint
- wp - watchpoint */
-
-/* Maximum number of hardware breakpoint and watchpoint registers.
- Neither of these values may exceed the width of dr_changed_t
- measured in bits. */
-
-#define AARCH64_HBP_MAX_NUM 16
-#define AARCH64_HWP_MAX_NUM 16
-
-/* Alignment requirement in bytes of hardware breakpoint and
- watchpoint address. This is the requirement for the addresses that
- can be written to the hardware breakpoint/watchpoint value
- registers. The kernel currently does not do any alignment on
- addresses when receiving a writing request (via ptrace call) to
- these debug registers, and it will reject any address that is
- unaligned.
- Some limited support has been provided in this gdbserver port for
- unaligned watchpoints, so that from a gdb user point of view, an
- unaligned watchpoint can still be set. This is achieved by
- minimally enlarging the watched area to meet the alignment
- requirement, and if necessary, splitting the watchpoint over
- several hardware watchpoint registers. */
-
-#define AARCH64_HBP_ALIGNMENT 4
-#define AARCH64_HWP_ALIGNMENT 8
-
-/* The maximum length of a memory region that can be watched by one
- hardware watchpoint register. */
-
-#define AARCH64_HWP_MAX_LEN_PER_REG 8
-
-/* Each bit of a variable of this type is used to indicate whether a
- hardware breakpoint or watchpoint setting has been changed since
- the last updating. Bit N corresponds to the Nth hardware
- breakpoint or watchpoint setting which is managed in
- aarch64_debug_reg_state. Where N is valid between 0 and the total
- number of the hardware breakpoint or watchpoint debug registers
- minus 1. When the bit N is 1, it indicates the corresponding
- breakpoint or watchpoint setting is changed, and thus the
- corresponding hardware debug register needs to be updated via the
- ptrace interface.
-
- In the per-thread arch-specific data area, we define two such
- variables for per-thread hardware breakpoint and watchpoint
- settings respectively.
-
- This type is part of the mechanism which helps reduce the number of
- ptrace calls to the kernel, i.e. avoid asking the kernel to write
- to the debug registers with unchanged values. */
-
-typedef unsigned long long dr_changed_t;
-
-/* Set each of the lower M bits of X to 1; assert X is wide enough. */
-
-#define DR_MARK_ALL_CHANGED(x, m) \
- do \
- { \
- gdb_assert (sizeof ((x)) * 8 >= (m)); \
- (x) = (((dr_changed_t)1 << (m)) - 1); \
- } while (0)
-
-#define DR_MARK_N_CHANGED(x, n) \
- do \
- { \
- (x) |= ((dr_changed_t)1 << (n)); \
- } while (0)
-
-#define DR_CLEAR_CHANGED(x) \
- do \
- { \
- (x) = 0; \
- } while (0)
-
-#define DR_HAS_CHANGED(x) ((x) != 0)
-#define DR_N_HAS_CHANGED(x, n) ((x) & ((dr_changed_t)1 << (n)))
-
-/* Structure for managing the hardware breakpoint/watchpoint resources.
- DR_ADDR_* stores the address, DR_CTRL_* stores the control register
- content, and DR_REF_COUNT_* counts the numbers of references to the
- corresponding bp/wp, by which way the limited hardware resources
- are not wasted on duplicated bp/wp settings (though so far gdb has
- done a good job by not sending duplicated bp/wp requests). */
-
-struct aarch64_debug_reg_state
-{
- /* hardware breakpoint */
- CORE_ADDR dr_addr_bp[AARCH64_HBP_MAX_NUM];
- unsigned int dr_ctrl_bp[AARCH64_HBP_MAX_NUM];
- unsigned int dr_ref_count_bp[AARCH64_HBP_MAX_NUM];
-
- /* hardware watchpoint */
- CORE_ADDR dr_addr_wp[AARCH64_HWP_MAX_NUM];
- unsigned int dr_ctrl_wp[AARCH64_HWP_MAX_NUM];
- unsigned int dr_ref_count_wp[AARCH64_HWP_MAX_NUM];
-};
-
/* Per-process arch-specific data we want to keep. */
struct arch_process_info
struct aarch64_debug_reg_state debug_reg_state;
};
-/* Per-thread arch-specific data we want to keep. */
+/* Return true if the size of register 0 is 8 byte. */
-struct arch_lwp_info
+static int
+is_64bit_tdesc (void)
{
- /* When bit N is 1, it indicates the Nth hardware breakpoint or
- watchpoint register pair needs to be updated when the thread is
- resumed; see aarch64_linux_prepare_to_resume. */
- dr_changed_t dr_changed_bp;
- dr_changed_t dr_changed_wp;
-};
+ struct regcache *regcache = get_thread_regcache (current_thread, 0);
-/* Number of hardware breakpoints/watchpoints the target supports.
- They are initialized with values obtained via the ptrace calls
- with NT_ARM_HW_BREAK and NT_ARM_HW_WATCH respectively. */
+ return register_size (regcache->tdesc, 0) == 8;
+}
-static int aarch64_num_bp_regs;
-static int aarch64_num_wp_regs;
+/* Implementation of linux_target_ops method "cannot_store_register". */
static int
aarch64_cannot_store_register (int regno)
return regno >= AARCH64_NUM_REGS;
}
+/* Implementation of linux_target_ops method "cannot_fetch_register". */
+
static int
aarch64_cannot_fetch_register (int regno)
{
was originally used to debug LinuxThreads support. */
extern int debug_threads;
+/* Implementation of linux_target_ops method "get_pc". */
+
static CORE_ADDR
aarch64_get_pc (struct regcache *regcache)
{
- unsigned long pc;
+ if (register_size (regcache->tdesc, 0) == 8)
+ {
+ unsigned long pc;
- collect_register_by_name (regcache, "pc", &pc);
- if (debug_threads)
- debug_printf ("stop pc is %08lx\n", pc);
- return pc;
+ collect_register_by_name (regcache, "pc", &pc);
+ if (debug_threads)
+ debug_printf ("stop pc is %08lx\n", pc);
+ return pc;
+ }
+ else
+ {
+ unsigned int pc;
+
+ collect_register_by_name (regcache, "pc", &pc);
+ if (debug_threads)
+ debug_printf ("stop pc is %04x\n", pc);
+ return pc;
+ }
}
+/* Implementation of linux_target_ops method "set_pc". */
+
static void
aarch64_set_pc (struct regcache *regcache, CORE_ADDR pc)
{
- unsigned long newpc = pc;
- supply_register_by_name (regcache, "pc", &newpc);
+ if (register_size (regcache->tdesc, 0) == 8)
+ {
+ unsigned long newpc = pc;
+ supply_register_by_name (regcache, "pc", &newpc);
+ }
+ else
+ {
+ unsigned int newpc = pc;
+ supply_register_by_name (regcache, "pc", &newpc);
+ }
}
-/* Correct in either endianness. */
-
#define aarch64_breakpoint_len 4
-static const unsigned long aarch64_breakpoint = 0x00800011;
+/* AArch64 BRK software debug mode instruction.
+ This instruction needs to match gdb/aarch64-tdep.c
+ (aarch64_default_breakpoint). */
+static const gdb_byte aarch64_breakpoint[] = {0x00, 0x00, 0x20, 0xd4};
+
+/* Implementation of linux_target_ops method "breakpoint_at". */
static int
aarch64_breakpoint_at (CORE_ADDR where)
{
- unsigned long insn;
+ gdb_byte insn[aarch64_breakpoint_len];
- (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
- if (insn == aarch64_breakpoint)
+ (*the_target->read_memory) (where, (unsigned char *) &insn,
+ aarch64_breakpoint_len);
+ if (memcmp (insn, aarch64_breakpoint, aarch64_breakpoint_len) == 0)
return 1;
return 0;
}
-/* Print the values of the cached breakpoint/watchpoint registers.
- This is enabled via the "set debug-hw-points" monitor command. */
-
-static void
-aarch64_show_debug_reg_state (struct aarch64_debug_reg_state *state,
- const char *func, CORE_ADDR addr,
- int len, enum target_hw_bp_type type)
-{
- int i;
-
- fprintf (stderr, "%s", func);
- if (addr || len)
- fprintf (stderr, " (addr=0x%08lx, len=%d, type=%s)",
- (unsigned long) addr, len,
- type == hw_write ? "hw-write-watchpoint"
- : (type == hw_read ? "hw-read-watchpoint"
- : (type == hw_access ? "hw-access-watchpoint"
- : (type == hw_execute ? "hw-breakpoint"
- : "??unknown??"))));
- fprintf (stderr, ":\n");
-
- fprintf (stderr, "\tBREAKPOINTs:\n");
- for (i = 0; i < aarch64_num_bp_regs; i++)
- fprintf (stderr, "\tBP%d: addr=0x%s, ctrl=0x%08x, ref.count=%d\n",
- i, paddress (state->dr_addr_bp[i]),
- state->dr_ctrl_bp[i], state->dr_ref_count_bp[i]);
-
- fprintf (stderr, "\tWATCHPOINTs:\n");
- for (i = 0; i < aarch64_num_wp_regs; i++)
- fprintf (stderr, "\tWP%d: addr=0x%s, ctrl=0x%08x, ref.count=%d\n",
- i, paddress (state->dr_addr_wp[i]),
- state->dr_ctrl_wp[i], state->dr_ref_count_wp[i]);
-}
-
static void
aarch64_init_debug_reg_state (struct aarch64_debug_reg_state *state)
{
}
}
-/* ptrace expects control registers to be formatted as follows:
-
- 31 13 5 3 1 0
- +--------------------------------+----------+------+------+----+
- | RESERVED (SBZ) | LENGTH | TYPE | PRIV | EN |
- +--------------------------------+----------+------+------+----+
-
- The TYPE field is ignored for breakpoints. */
-
-#define DR_CONTROL_ENABLED(ctrl) (((ctrl) & 0x1) == 1)
-#define DR_CONTROL_LENGTH(ctrl) (((ctrl) >> 5) & 0xff)
-
-/* Utility function that returns the length in bytes of a watchpoint
- according to the content of a hardware debug control register CTRL.
- Note that the kernel currently only supports the following Byte
- Address Select (BAS) values: 0x1, 0x3, 0xf and 0xff, which means
- that for a hardware watchpoint, its valid length can only be 1
- byte, 2 bytes, 4 bytes or 8 bytes. */
-
-static inline unsigned int
-aarch64_watchpoint_length (unsigned int ctrl)
-{
- switch (DR_CONTROL_LENGTH (ctrl))
- {
- case 0x01:
- return 1;
- case 0x03:
- return 2;
- case 0x0f:
- return 4;
- case 0xff:
- return 8;
- default:
- return 0;
- }
-}
-
-/* Given the hardware breakpoint or watchpoint type TYPE and its
- length LEN, return the expected encoding for a hardware
- breakpoint/watchpoint control register. */
-
-static unsigned int
-aarch64_point_encode_ctrl_reg (enum target_hw_bp_type type, int len)
-{
- unsigned int ctrl, ttype;
-
- /* type */
- switch (type)
- {
- case hw_write:
- ttype = 2;
- break;
- case hw_read:
- ttype = 1;
- break;
- case hw_access:
- ttype = 3;
- break;
- case hw_execute:
- ttype = 0;
- break;
- default:
- perror_with_name (_("Unrecognized breakpoint/watchpoint type"));
- }
-
- /* type */
- ctrl = ttype << 3;
- /* length bitmask */
- ctrl |= ((1 << len) - 1) << 5;
- /* enabled at el0 */
- ctrl |= (2 << 1) | 1;
-
- return ctrl;
-}
-
-/* Addresses to be written to the hardware breakpoint and watchpoint
- value registers need to be aligned; the alignment is 4-byte and
- 8-type respectively. Linux kernel rejects any non-aligned address
- it receives from the related ptrace call. Furthermore, the kernel
- currently only supports the following Byte Address Select (BAS)
- values: 0x1, 0x3, 0xf and 0xff, which means that for a hardware
- watchpoint to be accepted by the kernel (via ptrace call), its
- valid length can only be 1 byte, 2 bytes, 4 bytes or 8 bytes.
- Despite these limitations, the unaligned watchpoint is supported in
- this gdbserver port.
-
- Return 0 for any non-compliant ADDR and/or LEN; return 1 otherwise. */
-
-static int
-aarch64_point_is_aligned (int is_watchpoint, CORE_ADDR addr, int len)
-{
- unsigned int alignment = is_watchpoint ? AARCH64_HWP_ALIGNMENT
- : AARCH64_HBP_ALIGNMENT;
-
- if (addr & (alignment - 1))
- return 0;
-
- if (len != 8 && len != 4 && len != 2 && len != 1)
- return 0;
-
- return 1;
-}
-
-/* Given the (potentially unaligned) watchpoint address in ADDR and
- length in LEN, return the aligned address and aligned length in
- *ALIGNED_ADDR_P and *ALIGNED_LEN_P, respectively. The returned
- aligned address and length will be valid to be written to the
- hardware watchpoint value and control registers. See the comment
- above aarch64_point_is_aligned for the information about the
- alignment requirement. The given watchpoint may get truncated if
- more than one hardware register is needed to cover the watched
- region. *NEXT_ADDR_P and *NEXT_LEN_P, if non-NULL, will return the
- address and length of the remaining part of the watchpoint (which
- can be processed by calling this routine again to generate another
- aligned address and length pair.
-
- Essentially, unaligned watchpoint is achieved by minimally
- enlarging the watched area to meet the alignment requirement, and
- if necessary, splitting the watchpoint over several hardware
- watchpoint registers. The trade-off is that there will be
- false-positive hits for the read-type or the access-type hardware
- watchpoints; for the write type, which is more commonly used, there
- will be no such issues, as the higher-level breakpoint management
- in gdb always examines the exact watched region for any content
- change, and transparently resumes a thread from a watchpoint trap
- if there is no change to the watched region.
-
- Another limitation is that because the watched region is enlarged,
- the watchpoint fault address returned by
- aarch64_stopped_data_address may be outside of the original watched
- region, especially when the triggering instruction is accessing a
- larger region. When the fault address is not within any known
- range, watchpoints_triggered in gdb will get confused, as the
- higher-level watchpoint management is only aware of original
- watched regions, and will think that some unknown watchpoint has
- been triggered. In such a case, gdb may stop without displaying
- any detailed information.
-
- Once the kernel provides the full support for Byte Address Select
- (BAS) in the hardware watchpoint control register, these
- limitations can be largely relaxed with some further work. */
-
-static void
-aarch64_align_watchpoint (CORE_ADDR addr, int len, CORE_ADDR *aligned_addr_p,
- int *aligned_len_p, CORE_ADDR *next_addr_p,
- int *next_len_p)
-{
- int aligned_len;
- unsigned int offset;
- CORE_ADDR aligned_addr;
- const unsigned int alignment = AARCH64_HWP_ALIGNMENT;
- const unsigned int max_wp_len = AARCH64_HWP_MAX_LEN_PER_REG;
-
- /* As assumed by the algorithm. */
- gdb_assert (alignment == max_wp_len);
-
- if (len <= 0)
- return;
-
- /* Address to be put into the hardware watchpoint value register
- must be aligned. */
- offset = addr & (alignment - 1);
- aligned_addr = addr - offset;
-
- gdb_assert (offset >= 0 && offset < alignment);
- gdb_assert (aligned_addr >= 0 && aligned_addr <= addr);
- gdb_assert ((offset + len) > 0);
-
- if (offset + len >= max_wp_len)
- {
- /* Need more than one watchpoint registers; truncate it at the
- alignment boundary. */
- aligned_len = max_wp_len;
- len -= (max_wp_len - offset);
- addr += (max_wp_len - offset);
- gdb_assert ((addr & (alignment - 1)) == 0);
- }
- else
- {
- /* Find the smallest valid length that is large enough to
- accommodate this watchpoint. */
- static const unsigned char
- aligned_len_array[AARCH64_HWP_MAX_LEN_PER_REG] =
- { 1, 2, 4, 4, 8, 8, 8, 8 };
-
- aligned_len = aligned_len_array[offset + len - 1];
- addr += len;
- len = 0;
- }
-
- if (aligned_addr_p != NULL)
- *aligned_addr_p = aligned_addr;
- if (aligned_len_p != NULL)
- *aligned_len_p = aligned_len;
- if (next_addr_p != NULL)
- *next_addr_p = addr;
- if (next_len_p != NULL)
- *next_len_p = len;
-}
-
-/* Call ptrace to set the thread TID's hardware breakpoint/watchpoint
- registers with data from *STATE. */
-
-static void
-aarch64_linux_set_debug_regs (const struct aarch64_debug_reg_state *state,
- int tid, int watchpoint)
-{
- int i, count;
- struct iovec iov;
- struct user_hwdebug_state regs;
- const CORE_ADDR *addr;
- const unsigned int *ctrl;
-
- memset (®s, 0, sizeof (regs));
- iov.iov_base = ®s;
- count = watchpoint ? aarch64_num_wp_regs : aarch64_num_bp_regs;
- addr = watchpoint ? state->dr_addr_wp : state->dr_addr_bp;
- ctrl = watchpoint ? state->dr_ctrl_wp : state->dr_ctrl_bp;
- if (count == 0)
- return;
- iov.iov_len = (offsetof (struct user_hwdebug_state, dbg_regs[count - 1])
- + sizeof (regs.dbg_regs [count - 1]));
-
- for (i = 0; i < count; i++)
- {
- regs.dbg_regs[i].addr = addr[i];
- regs.dbg_regs[i].ctrl = ctrl[i];
- }
-
- if (ptrace (PTRACE_SETREGSET, tid,
- watchpoint ? NT_ARM_HW_WATCH : NT_ARM_HW_BREAK,
- (void *) &iov))
- error (_("Unexpected error setting hardware debug registers"));
-}
-
-struct aarch64_dr_update_callback_param
-{
- int pid;
- int is_watchpoint;
- unsigned int idx;
-};
-
-/* Callback function which records the information about the change of
- one hardware breakpoint/watchpoint setting for the thread ENTRY.
- The information is passed in via PTR.
- N.B. The actual updating of hardware debug registers is not
- carried out until the moment the thread is resumed. */
-
-static int
-debug_reg_change_callback (struct inferior_list_entry *entry, void *ptr)
-{
- struct thread_info *thread = (struct thread_info *) entry;
- struct lwp_info *lwp = get_thread_lwp (thread);
- struct aarch64_dr_update_callback_param *param_p
- = (struct aarch64_dr_update_callback_param *) ptr;
- int pid = param_p->pid;
- int idx = param_p->idx;
- int is_watchpoint = param_p->is_watchpoint;
- struct arch_lwp_info *info = lwp->arch_private;
- dr_changed_t *dr_changed_ptr;
- dr_changed_t dr_changed;
-
- if (show_debug_regs)
- {
- fprintf (stderr, "debug_reg_change_callback: \n\tOn entry:\n");
- fprintf (stderr, "\tpid%d, tid: %ld, dr_changed_bp=0x%llx, "
- "dr_changed_wp=0x%llx\n",
- pid, lwpid_of (thread), info->dr_changed_bp,
- info->dr_changed_wp);
- }
-
- dr_changed_ptr = is_watchpoint ? &info->dr_changed_wp
- : &info->dr_changed_bp;
- dr_changed = *dr_changed_ptr;
-
- /* Only update the threads of this process. */
- if (pid_of (thread) == pid)
- {
- gdb_assert (idx >= 0
- && (idx <= (is_watchpoint ? aarch64_num_wp_regs
- : aarch64_num_bp_regs)));
-
- /* The following assertion is not right, as there can be changes
- that have not been made to the hardware debug registers
- before new changes overwrite the old ones. This can happen,
- for instance, when the breakpoint/watchpoint hit one of the
- threads and the user enters continue; then what happens is:
- 1) all breakpoints/watchpoints are removed for all threads;
- 2) a single step is carried out for the thread that was hit;
- 3) all of the points are inserted again for all threads;
- 4) all threads are resumed.
- The 2nd step will only affect the one thread in which the
- bp/wp was hit, which means only that one thread is resumed;
- remember that the actual updating only happen in
- aarch64_linux_prepare_to_resume, so other threads remain
- stopped during the removal and insertion of bp/wp. Therefore
- for those threads, the change of insertion of the bp/wp
- overwrites that of the earlier removals. (The situation may
- be different when bp/wp is steppable, or in the non-stop
- mode.) */
- /* gdb_assert (DR_N_HAS_CHANGED (dr_changed, idx) == 0); */
-
- /* The actual update is done later just before resuming the lwp,
- we just mark that one register pair needs updating. */
- DR_MARK_N_CHANGED (dr_changed, idx);
- *dr_changed_ptr = dr_changed;
-
- /* If the lwp isn't stopped, force it to momentarily pause, so
- we can update its debug registers. */
- if (!lwp->stopped)
- linux_stop_lwp (lwp);
- }
-
- if (show_debug_regs)
- {
- fprintf (stderr, "\tOn exit:\n\tpid%d, tid: %ld, dr_changed_bp=0x%llx, "
- "dr_changed_wp=0x%llx\n",
- pid, lwpid_of (thread), info->dr_changed_bp,
- info->dr_changed_wp);
- }
-
- return 0;
-}
-
-/* Notify each thread that their IDXth breakpoint/watchpoint register
- pair needs to be updated. The message will be recorded in each
- thread's arch-specific data area, the actual updating will be done
- when the thread is resumed. */
-
-void
-aarch64_notify_debug_reg_change (const struct aarch64_debug_reg_state *state,
- int is_watchpoint, unsigned int idx)
-{
- struct aarch64_dr_update_callback_param param;
-
- /* Only update the threads of this process. */
- param.pid = pid_of (current_thread);
-
- param.is_watchpoint = is_watchpoint;
- param.idx = idx;
-
- find_inferior (&all_threads, debug_reg_change_callback, (void *) ¶m);
-}
-
-
/* Return the pointer to the debug register state structure in the
current process' arch-specific data area. */
-static struct aarch64_debug_reg_state *
-aarch64_get_debug_reg_state ()
-{
- struct process_info *proc;
-
- proc = current_process ();
- return &proc->private->arch_private->debug_reg_state;
-}
-
-/* Record the insertion of one breakpoint/watchpoint, as represented
- by ADDR and CTRL, in the process' arch-specific data area *STATE. */
-
-static int
-aarch64_dr_state_insert_one_point (struct aarch64_debug_reg_state *state,
- enum target_hw_bp_type type,
- CORE_ADDR addr, int len)
-{
- int i, idx, num_regs, is_watchpoint;
- unsigned int ctrl, *dr_ctrl_p, *dr_ref_count;
- CORE_ADDR *dr_addr_p;
-
- /* Set up state pointers. */
- is_watchpoint = (type != hw_execute);
- gdb_assert (aarch64_point_is_aligned (is_watchpoint, addr, len));
- if (is_watchpoint)
- {
- num_regs = aarch64_num_wp_regs;
- dr_addr_p = state->dr_addr_wp;
- dr_ctrl_p = state->dr_ctrl_wp;
- dr_ref_count = state->dr_ref_count_wp;
- }
- else
- {
- num_regs = aarch64_num_bp_regs;
- dr_addr_p = state->dr_addr_bp;
- dr_ctrl_p = state->dr_ctrl_bp;
- dr_ref_count = state->dr_ref_count_bp;
- }
-
- ctrl = aarch64_point_encode_ctrl_reg (type, len);
-
- /* Find an existing or free register in our cache. */
- idx = -1;
- for (i = 0; i < num_regs; ++i)
- {
- if ((dr_ctrl_p[i] & 1) == 0)
- {
- gdb_assert (dr_ref_count[i] == 0);
- idx = i;
- /* no break; continue hunting for an exising one. */
- }
- else if (dr_addr_p[i] == addr && dr_ctrl_p[i] == ctrl)
- {
- gdb_assert (dr_ref_count[i] != 0);
- idx = i;
- break;
- }
- }
-
- /* No space. */
- if (idx == -1)
- return -1;
-
- /* Update our cache. */
- if ((dr_ctrl_p[idx] & 1) == 0)
- {
- /* new entry */
- dr_addr_p[idx] = addr;
- dr_ctrl_p[idx] = ctrl;
- dr_ref_count[idx] = 1;
- /* Notify the change. */
- aarch64_notify_debug_reg_change (state, is_watchpoint, idx);
- }
- else
- {
- /* existing entry */
- dr_ref_count[idx]++;
- }
-
- return 0;
-}
-
-/* Record the removal of one breakpoint/watchpoint, as represented by
- ADDR and CTRL, in the process' arch-specific data area *STATE. */
-
-static int
-aarch64_dr_state_remove_one_point (struct aarch64_debug_reg_state *state,
- enum target_hw_bp_type type,
- CORE_ADDR addr, int len)
+struct aarch64_debug_reg_state *
+aarch64_get_debug_reg_state (pid_t pid)
{
- int i, num_regs, is_watchpoint;
- unsigned int ctrl, *dr_ctrl_p, *dr_ref_count;
- CORE_ADDR *dr_addr_p;
+ struct process_info *proc = find_process_pid (pid);
- /* Set up state pointers. */
- is_watchpoint = (type != hw_execute);
- gdb_assert (aarch64_point_is_aligned (is_watchpoint, addr, len));
- if (is_watchpoint)
- {
- num_regs = aarch64_num_wp_regs;
- dr_addr_p = state->dr_addr_wp;
- dr_ctrl_p = state->dr_ctrl_wp;
- dr_ref_count = state->dr_ref_count_wp;
- }
- else
- {
- num_regs = aarch64_num_bp_regs;
- dr_addr_p = state->dr_addr_bp;
- dr_ctrl_p = state->dr_ctrl_bp;
- dr_ref_count = state->dr_ref_count_bp;
- }
-
- ctrl = aarch64_point_encode_ctrl_reg (type, len);
-
- /* Find the entry that matches the ADDR and CTRL. */
- for (i = 0; i < num_regs; ++i)
- if (dr_addr_p[i] == addr && dr_ctrl_p[i] == ctrl)
- {
- gdb_assert (dr_ref_count[i] != 0);
- break;
- }
-
- /* Not found. */
- if (i == num_regs)
- return -1;
-
- /* Clear our cache. */
- if (--dr_ref_count[i] == 0)
- {
- /* Clear the enable bit. */
- ctrl &= ~1;
- dr_addr_p[i] = 0;
- dr_ctrl_p[i] = ctrl;
- /* Notify the change. */
- aarch64_notify_debug_reg_change (state, is_watchpoint, i);
- }
-
- return 0;
+ return &proc->priv->arch_private->debug_reg_state;
}
-static int
-aarch64_handle_breakpoint (enum target_hw_bp_type type, CORE_ADDR addr,
- int len, int is_insert)
-{
- struct aarch64_debug_reg_state *state;
-
- /* The hardware breakpoint on AArch64 should always be 4-byte
- aligned. */
- if (!aarch64_point_is_aligned (0 /* is_watchpoint */ , addr, len))
- return -1;
-
- state = aarch64_get_debug_reg_state ();
-
- if (is_insert)
- return aarch64_dr_state_insert_one_point (state, type, addr, len);
- else
- return aarch64_dr_state_remove_one_point (state, type, addr, len);
-}
-
-/* This is essentially the same as aarch64_handle_breakpoint, apart
- from that it is an aligned watchpoint to be handled. */
-
-static int
-aarch64_handle_aligned_watchpoint (enum target_hw_bp_type type,
- CORE_ADDR addr, int len, int is_insert)
-{
- struct aarch64_debug_reg_state *state;
-
- state = aarch64_get_debug_reg_state ();
-
- if (is_insert)
- return aarch64_dr_state_insert_one_point (state, type, addr, len);
- else
- return aarch64_dr_state_remove_one_point (state, type, addr, len);
-}
-
-/* Insert/remove unaligned watchpoint by calling
- aarch64_align_watchpoint repeatedly until the whole watched region,
- as represented by ADDR and LEN, has been properly aligned and ready
- to be written to one or more hardware watchpoint registers.
- IS_INSERT indicates whether this is an insertion or a deletion.
- Return 0 if succeed. */
-
-static int
-aarch64_handle_unaligned_watchpoint (enum target_hw_bp_type type,
- CORE_ADDR addr, int len, int is_insert)
-{
- struct aarch64_debug_reg_state *state
- = aarch64_get_debug_reg_state ();
-
- while (len > 0)
- {
- CORE_ADDR aligned_addr;
- int aligned_len, ret;
-
- aarch64_align_watchpoint (addr, len, &aligned_addr, &aligned_len,
- &addr, &len);
-
- if (is_insert)
- ret = aarch64_dr_state_insert_one_point (state, type, aligned_addr,
- aligned_len);
- else
- ret = aarch64_dr_state_remove_one_point (state, type, aligned_addr,
- aligned_len);
-
- if (show_debug_regs)
- fprintf (stderr,
- "handle_unaligned_watchpoint: is_insert: %d\n"
- " aligned_addr: 0x%s, aligned_len: %d\n"
- " next_addr: 0x%s, next_len: %d\n",
- is_insert, paddress (aligned_addr), aligned_len,
- paddress (addr), len);
-
- if (ret != 0)
- return ret;
- }
-
- return 0;
-}
-
-static int
-aarch64_handle_watchpoint (enum target_hw_bp_type type, CORE_ADDR addr,
- int len, int is_insert)
-{
- if (aarch64_point_is_aligned (1 /* is_watchpoint */ , addr, len))
- return aarch64_handle_aligned_watchpoint (type, addr, len, is_insert);
- else
- return aarch64_handle_unaligned_watchpoint (type, addr, len, is_insert);
-}
+/* Implementation of linux_target_ops method "supports_z_point_type". */
static int
aarch64_supports_z_point_type (char z_type)
{
switch (z_type)
{
+ case Z_PACKET_SW_BP:
+ {
+ if (!extended_protocol && is_64bit_tdesc ())
+ {
+ /* Only enable Z0 packet in non-multi-arch debugging. If
+ extended protocol is used, don't enable Z0 packet because
+ GDBserver may attach to 32-bit process. */
+ return 1;
+ }
+ else
+ {
+ /* Disable Z0 packet so that GDBserver doesn't have to handle
+ different breakpoint instructions (aarch64, arm, thumb etc)
+ in multi-arch debugging. */
+ return 0;
+ }
+ }
case Z_PACKET_HW_BP:
case Z_PACKET_WRITE_WP:
case Z_PACKET_READ_WP:
case Z_PACKET_ACCESS_WP:
return 1;
default:
- /* Leave the handling of sw breakpoints with the gdb client. */
return 0;
}
}
-/* Insert a hardware breakpoint/watchpoint.
- It actually only records the info of the to-be-inserted bp/wp;
- the actual insertion will happen when threads are resumed.
+/* Implementation of linux_target_ops method "insert_point".
- Return 0 if succeed;
- Return 1 if TYPE is unsupported type;
- Return -1 if an error occurs. */
+ It actually only records the info of the to-be-inserted bp/wp;
+ the actual insertion will happen when threads are resumed. */
static int
aarch64_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
{
int ret;
enum target_hw_bp_type targ_type;
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (pid_of (current_thread));
if (show_debug_regs)
fprintf (stderr, "insert_point on entry (addr=0x%08lx, len=%d)\n",
targ_type = raw_bkpt_type_to_target_hw_bp_type (type);
if (targ_type != hw_execute)
- ret =
- aarch64_handle_watchpoint (targ_type, addr, len, 1 /* is_insert */);
+ {
+ if (aarch64_linux_region_ok_for_watchpoint (addr, len))
+ ret = aarch64_handle_watchpoint (targ_type, addr, len,
+ 1 /* is_insert */, state);
+ else
+ ret = -1;
+ }
else
ret =
- aarch64_handle_breakpoint (targ_type, addr, len, 1 /* is_insert */);
+ aarch64_handle_breakpoint (targ_type, addr, len, 1 /* is_insert */,
+ state);
- if (show_debug_regs > 1)
- aarch64_show_debug_reg_state (aarch64_get_debug_reg_state (),
- "insert_point", addr, len, targ_type);
+ if (show_debug_regs)
+ aarch64_show_debug_reg_state (state, "insert_point", addr, len,
+ targ_type);
return ret;
}
-/* Remove a hardware breakpoint/watchpoint.
- It actually only records the info of the to-be-removed bp/wp,
- the actual removal will be done when threads are resumed.
+/* Implementation of linux_target_ops method "remove_point".
- Return 0 if succeed;
- Return 1 if TYPE is an unsupported type;
- Return -1 if an error occurs. */
+ It actually only records the info of the to-be-removed bp/wp,
+ the actual removal will be done when threads are resumed. */
static int
aarch64_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
{
int ret;
enum target_hw_bp_type targ_type;
+ struct aarch64_debug_reg_state *state
+ = aarch64_get_debug_reg_state (pid_of (current_thread));
if (show_debug_regs)
fprintf (stderr, "remove_point on entry (addr=0x%08lx, len=%d)\n",
/* Set up state pointers. */
if (targ_type != hw_execute)
ret =
- aarch64_handle_watchpoint (targ_type, addr, len, 0 /* is_insert */);
+ aarch64_handle_watchpoint (targ_type, addr, len, 0 /* is_insert */,
+ state);
else
ret =
- aarch64_handle_breakpoint (targ_type, addr, len, 0 /* is_insert */);
+ aarch64_handle_breakpoint (targ_type, addr, len, 0 /* is_insert */,
+ state);
- if (show_debug_regs > 1)
- aarch64_show_debug_reg_state (aarch64_get_debug_reg_state (),
- "remove_point", addr, len, targ_type);
+ if (show_debug_regs)
+ aarch64_show_debug_reg_state (state, "remove_point", addr, len,
+ targ_type);
return ret;
}
-/* Returns the address associated with the watchpoint that hit, if
- any; returns 0 otherwise. */
+/* Implementation of linux_target_ops method "stopped_data_address". */
static CORE_ADDR
aarch64_stopped_data_address (void)
return (CORE_ADDR) 0;
/* Check if the address matches any watched address. */
- state = aarch64_get_debug_reg_state ();
+ state = aarch64_get_debug_reg_state (pid_of (current_thread));
for (i = aarch64_num_wp_regs - 1; i >= 0; --i)
{
const unsigned int len = aarch64_watchpoint_length (state->dr_ctrl_wp[i]);
return (CORE_ADDR) 0;
}
-/* Returns 1 if target was stopped due to a watchpoint hit, 0
- otherwise. */
+/* Implementation of linux_target_ops method "stopped_by_watchpoint". */
static int
aarch64_stopped_by_watchpoint (void)
return PS_OK;
}
-/* Called when a new process is created. */
+/* Implementation of linux_target_ops method "siginfo_fixup". */
-static struct arch_process_info *
-aarch64_linux_new_process (void)
+static int
+aarch64_linux_siginfo_fixup (siginfo_t *native, void *inf, int direction)
{
- struct arch_process_info *info = xcalloc (1, sizeof (*info));
+ /* Is the inferior 32-bit? If so, then fixup the siginfo object. */
+ if (!is_64bit_tdesc ())
+ {
+ if (direction == 0)
+ aarch64_compat_siginfo_from_siginfo ((struct compat_siginfo *) inf,
+ native);
+ else
+ aarch64_siginfo_from_compat_siginfo (native,
+ (struct compat_siginfo *) inf);
- aarch64_init_debug_reg_state (&info->debug_reg_state);
+ return 1;
+ }
- return info;
+ return 0;
}
-/* Called when a new thread is detected. */
+/* Implementation of linux_target_ops method "linux_new_process". */
-static struct arch_lwp_info *
-aarch64_linux_new_thread (void)
+static struct arch_process_info *
+aarch64_linux_new_process (void)
{
- struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
+ struct arch_process_info *info = XCNEW (struct arch_process_info);
- /* Mark that all the hardware breakpoint/watchpoint register pairs
- for this thread need to be initialized (with data from
- aarch_process_info.debug_reg_state). */
- DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs);
- DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs);
+ aarch64_init_debug_reg_state (&info->debug_reg_state);
return info;
}
-/* Called when resuming a thread.
- If the debug regs have changed, update the thread's copies. */
+/* Implementation of linux_target_ops method "linux_new_fork". */
static void
-aarch64_linux_prepare_to_resume (struct lwp_info *lwp)
+aarch64_linux_new_fork (struct process_info *parent,
+ struct process_info *child)
{
- struct thread_info *thread = get_lwp_thread (lwp);
- ptid_t ptid = ptid_of (thread);
- struct arch_lwp_info *info = lwp->arch_private;
+ /* These are allocated by linux_add_process. */
+ gdb_assert (parent->priv != NULL
+ && parent->priv->arch_private != NULL);
+ gdb_assert (child->priv != NULL
+ && child->priv->arch_private != NULL);
- if (DR_HAS_CHANGED (info->dr_changed_bp)
- || DR_HAS_CHANGED (info->dr_changed_wp))
- {
- int tid = ptid_get_lwp (ptid);
- struct process_info *proc = find_process_pid (ptid_get_pid (ptid));
- struct aarch64_debug_reg_state *state
- = &proc->private->arch_private->debug_reg_state;
-
- if (show_debug_regs)
- fprintf (stderr, "prepare_to_resume thread %ld\n", lwpid_of (thread));
-
- /* Watchpoints. */
- if (DR_HAS_CHANGED (info->dr_changed_wp))
- {
- aarch64_linux_set_debug_regs (state, tid, 1);
- DR_CLEAR_CHANGED (info->dr_changed_wp);
- }
-
- /* Breakpoints. */
- if (DR_HAS_CHANGED (info->dr_changed_bp))
- {
- aarch64_linux_set_debug_regs (state, tid, 0);
- DR_CLEAR_CHANGED (info->dr_changed_bp);
- }
- }
-}
+ /* Linux kernel before 2.6.33 commit
+ 72f674d203cd230426437cdcf7dd6f681dad8b0d
+ will inherit hardware debug registers from parent
+ on fork/vfork/clone. Newer Linux kernels create such tasks with
+ zeroed debug registers.
-/* ptrace hardware breakpoint resource info is formatted as follows:
+ GDB core assumes the child inherits the watchpoints/hw
+ breakpoints of the parent, and will remove them all from the
+ forked off process. Copy the debug registers mirrors into the
+ new process so that all breakpoints and watchpoints can be
+ removed together. The debug registers mirror will become zeroed
+ in the end before detaching the forked off process, thus making
+ this compatible with older Linux kernels too. */
- 31 24 16 8 0
- +---------------+--------------+---------------+---------------+
- | RESERVED | RESERVED | DEBUG_ARCH | NUM_SLOTS |
- +---------------+--------------+---------------+---------------+ */
+ *child->priv->arch_private = *parent->priv->arch_private;
+}
-#define AARCH64_DEBUG_NUM_SLOTS(x) ((x) & 0xff)
-#define AARCH64_DEBUG_ARCH(x) (((x) >> 8) & 0xff)
-#define AARCH64_DEBUG_ARCH_V8 0x6
+/* Return the right target description according to the ELF file of
+ current thread. */
-static void
-aarch64_arch_setup (void)
+static const struct target_desc *
+aarch64_linux_read_description (void)
{
- int pid;
- struct iovec iov;
- struct user_hwdebug_state dreg_state;
+ unsigned int machine;
+ int is_elf64;
+ int tid;
- current_process ()->tdesc = tdesc_aarch64;
+ tid = lwpid_of (current_thread);
- pid = lwpid_of (current_thread);
- iov.iov_base = &dreg_state;
- iov.iov_len = sizeof (dreg_state);
+ is_elf64 = linux_pid_exe_is_elf_64_file (tid, &machine);
- /* Get hardware watchpoint register info. */
- if (ptrace (PTRACE_GETREGSET, pid, NT_ARM_HW_WATCH, &iov) == 0
- && AARCH64_DEBUG_ARCH (dreg_state.dbg_info) == AARCH64_DEBUG_ARCH_V8)
- {
- aarch64_num_wp_regs = AARCH64_DEBUG_NUM_SLOTS (dreg_state.dbg_info);
- if (aarch64_num_wp_regs > AARCH64_HWP_MAX_NUM)
- {
- warning ("Unexpected number of hardware watchpoint registers reported"
- " by ptrace, got %d, expected %d.",
- aarch64_num_wp_regs, AARCH64_HWP_MAX_NUM);
- aarch64_num_wp_regs = AARCH64_HWP_MAX_NUM;
- }
- }
+ if (is_elf64)
+ return tdesc_aarch64;
else
- {
- warning ("Unable to determine the number of hardware watchpoints"
- " available.");
- aarch64_num_wp_regs = 0;
- }
+ return tdesc_arm_with_neon;
+}
- /* Get hardware breakpoint register info. */
- if (ptrace (PTRACE_GETREGSET, pid, NT_ARM_HW_BREAK, &iov) == 0
- && AARCH64_DEBUG_ARCH (dreg_state.dbg_info) == AARCH64_DEBUG_ARCH_V8)
- {
- aarch64_num_bp_regs = AARCH64_DEBUG_NUM_SLOTS (dreg_state.dbg_info);
- if (aarch64_num_bp_regs > AARCH64_HBP_MAX_NUM)
- {
- warning ("Unexpected number of hardware breakpoint registers reported"
- " by ptrace, got %d, expected %d.",
- aarch64_num_bp_regs, AARCH64_HBP_MAX_NUM);
- aarch64_num_bp_regs = AARCH64_HBP_MAX_NUM;
- }
- }
- else
- {
- warning ("Unable to determine the number of hardware breakpoints"
- " available.");
- aarch64_num_bp_regs = 0;
- }
+/* Implementation of linux_target_ops method "arch_setup". */
+
+static void
+aarch64_arch_setup (void)
+{
+ current_process ()->tdesc = aarch64_linux_read_description ();
+
+ aarch64_linux_get_debug_reg_capacity (lwpid_of (current_thread));
}
static struct regset_info aarch64_regsets[] =
NULL, /* disabled_regsets */
};
-static struct usrregs_info aarch64_usrregs_info =
- {
- AARCH64_NUM_REGS,
- aarch64_regmap,
- };
-
-static struct regs_info regs_info =
+static struct regs_info regs_info_aarch64 =
{
NULL, /* regset_bitmap */
- &aarch64_usrregs_info,
+ NULL, /* usrregs */
&aarch64_regsets_info,
};
+/* Implementation of linux_target_ops method "regs_info". */
+
static const struct regs_info *
aarch64_regs_info (void)
{
- return ®s_info;
+ if (is_64bit_tdesc ())
+ return ®s_info_aarch64;
+ else
+ return ®s_info_aarch32;
+}
+
+/* Implementation of linux_target_ops method "supports_tracepoints". */
+
+static int
+aarch64_supports_tracepoints (void)
+{
+ if (current_thread == NULL)
+ return 1;
+ else
+ {
+ /* We don't support tracepoints on aarch32 now. */
+ return is_64bit_tdesc ();
+ }
+}
+
+/* Implementation of linux_target_ops method "supports_range_stepping". */
+
+static int
+aarch64_supports_range_stepping (void)
+{
+ return 1;
}
struct linux_target_ops the_low_target =
aarch64_regs_info,
aarch64_cannot_fetch_register,
aarch64_cannot_store_register,
- NULL,
+ NULL, /* fetch_register */
aarch64_get_pc,
aarch64_set_pc,
(const unsigned char *) &aarch64_breakpoint,
aarch64_breakpoint_len,
- NULL,
- 0,
+ NULL, /* breakpoint_reinsert_addr */
+ 0, /* decr_pc_after_break */
aarch64_breakpoint_at,
aarch64_supports_z_point_type,
aarch64_insert_point,
aarch64_remove_point,
aarch64_stopped_by_watchpoint,
aarch64_stopped_data_address,
- NULL,
- NULL,
- NULL,
+ NULL, /* collect_ptrace_register */
+ NULL, /* supply_ptrace_register */
+ aarch64_linux_siginfo_fixup,
aarch64_linux_new_process,
aarch64_linux_new_thread,
+ aarch64_linux_new_fork,
aarch64_linux_prepare_to_resume,
+ NULL, /* process_qsupported */
+ aarch64_supports_tracepoints,
+ NULL, /* get_thread_area */
+ NULL, /* install_fast_tracepoint_jump_pad */
+ NULL, /* emit_ops */
+ NULL, /* get_min_fast_tracepoint_insn_len */
+ aarch64_supports_range_stepping,
};
void
{
init_registers_aarch64 ();
+ initialize_low_arch_aarch32 ();
+
initialize_regsets_info (&aarch64_regsets_info);
}
projects / deliverable / binutils-gdb.git / blobdiff