/* 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-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>
#include "gdb_proc_service.h"
#define AARCH64_PC_REGNO 32
#define AARCH64_CPSR_REGNO 33
#define AARCH64_V0_REGNO 34
+#define AARCH64_FPSR_REGNO (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM)
+#define AARCH64_FPCR_REGNO (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM + 1)
-#define AARCH64_NUM_REGS (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM)
-
-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];
-};
+#define AARCH64_NUM_REGS (AARCH64_V0_REGNO + AARCH64_V_REGS_NUM + 2)
/* Per-process arch-specific data we want to keep. */
struct aarch64_debug_reg_state debug_reg_state;
};
-/* Per-thread arch-specific data we want to keep. */
-
-struct arch_lwp_info
-{
- /* 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;
-};
-
-/* 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. */
-
-static int aarch64_num_bp_regs;
-static int aarch64_num_wp_regs;
+/* Return true if the size of register 0 is 8 byte. */
-/* Hardware breakpoint/watchpoint types.
- The values map to their encodings in the bit 4 and bit 3 of the
- hardware breakpoint/watchpoint control registers. */
-
-enum target_point_type
+static int
+is_64bit_tdesc (void)
{
- hw_execute = 0, /* Execute HW breakpoint */
- hw_read = 1, /* Read HW watchpoint */
- hw_write = 2, /* Common HW watchpoint */
- hw_access = 3, /* Access HW watchpoint */
- point_type_unsupported
-};
-
-#define Z_PACKET_SW_BP '0'
-#define Z_PACKET_HW_BP '1'
-#define Z_PACKET_WRITE_WP '2'
-#define Z_PACKET_READ_WP '3'
-#define Z_PACKET_ACCESS_WP '4'
+ struct regcache *regcache = get_thread_regcache (current_thread, 0);
-/* Map the protocol breakpoint/watchpoint type TYPE to
- enum target_point_type. */
-
-static enum target_point_type
-Z_packet_to_point_type (char type)
-{
- switch (type)
- {
- case Z_PACKET_SW_BP:
- /* Leave the handling of the sw breakpoint with the gdb client. */
- return point_type_unsupported;
- case Z_PACKET_HW_BP:
- return hw_execute;
- case Z_PACKET_WRITE_WP:
- return hw_write;
- case Z_PACKET_READ_WP:
- return hw_read;
- case Z_PACKET_ACCESS_WP:
- return hw_access;
- default:
- return point_type_unsupported;
- }
+ return register_size (regcache->tdesc, 0) == 8;
}
+/* 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)
{
for (i = 0; i < AARCH64_V_REGS_NUM; i++)
collect_register (regcache, AARCH64_V0_REGNO + i, ®set->vregs[i]);
+ collect_register (regcache, AARCH64_FPSR_REGNO, ®set->fpsr);
+ collect_register (regcache, AARCH64_FPCR_REGNO, ®set->fpcr);
}
static void
for (i = 0; i < AARCH64_V_REGS_NUM; i++)
supply_register (regcache, AARCH64_V0_REGNO + i, ®set->vregs[i]);
+ supply_register (regcache, AARCH64_FPSR_REGNO, ®set->fpsr);
+ supply_register (regcache, AARCH64_FPCR_REGNO, ®set->fpcr);
}
-/* Debugging of hardware breakpoint/watchpoint support. */
-extern int debug_hw_points;
-
/* Enable miscellaneous debugging output. The name is historical - it
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;
+ }
+ else
+ {
+ unsigned int pc;
- collect_register_by_name (regcache, "pc", &pc);
- if (debug_threads)
- fprintf (stderr, "stop pc is %08lx\n", pc);
- return 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_point_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_point_type type, int len)
-{
- unsigned int ctrl;
-
- /* type */
- ctrl = type << 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.
+/* Callback for iterate_over_lwps. Records the
+ information about the change of one hardware breakpoint/watchpoint
+ setting for the thread LWP.
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)
+debug_reg_change_callback (struct lwp_info *lwp, void *ptr)
{
- struct lwp_info *lwp = (struct lwp_info *) entry;
struct aarch64_dr_update_callback_param *param_p
= (struct aarch64_dr_update_callback_param *) ptr;
- int pid = param_p->pid;
+ int pid = pid_of (lwp->thread);
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 (debug_hw_points)
+ 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 (lwp), info->dr_changed_bp,
- info->dr_changed_wp);
+ debug_printf ("debug_reg_change_callback: \n\tOn entry:\n");
+ debug_printf ("\tpid%d, dr_changed_bp=0x%s, "
+ "dr_changed_wp=0x%s\n", pid,
+ phex (info->dr_changed_bp, 8),
+ phex (info->dr_changed_wp, 8));
}
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 (lwp) == 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);
- }
+ gdb_assert (idx >= 0
+ && (idx <= (is_watchpoint ? aarch64_num_wp_regs
+ : aarch64_num_bp_regs)));
- if (debug_hw_points)
+ /* 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 (lwp), info->dr_changed_bp, info->dr_changed_wp);
+ debug_printf ("\tOn exit:\n\tpid%d, dr_changed_bp=0x%s, "
+ "dr_changed_wp=0x%s\n", pid,
+ phex (info->dr_changed_bp, 8),
+ phex (info->dr_changed_wp, 8));
}
return 0;
int is_watchpoint, unsigned int idx)
{
struct aarch64_dr_update_callback_param param;
-
- /* Only update the threads of this process. */
- param.pid = pid_of (get_thread_lwp (current_inferior));
+ ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ()));
param.is_watchpoint = is_watchpoint;
param.idx = idx;
- find_inferior (&all_lwps, debug_reg_change_callback, (void *) ¶m);
+ iterate_over_lwps (pid_ptid, debug_reg_change_callback, (void *) ¶m);
}
struct process_info *proc;
proc = current_process ();
- return &proc->private->arch_private->debug_reg_state;
+ return &proc->priv->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. */
+/* Implementation of linux_target_ops method "supports_z_point_type". */
static int
-aarch64_dr_state_insert_one_point (struct aarch64_debug_reg_state *state,
- enum target_point_type type,
- CORE_ADDR addr, int len)
+aarch64_supports_z_point_type (char z_type)
{
- 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)
+ switch (z_type)
{
- /* 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_point_type type,
- CORE_ADDR addr, int len)
-{
- int i, 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 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)
+ case Z_PACKET_SW_BP:
{
- gdb_assert (dr_ref_count[i] != 0);
- break;
+ 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;
+ }
}
-
- /* 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);
+ case Z_PACKET_HW_BP:
+ case Z_PACKET_WRITE_WP:
+ case Z_PACKET_READ_WP:
+ case Z_PACKET_ACCESS_WP:
+ return 1;
+ default:
+ return 0;
}
-
- return 0;
-}
-
-static int
-aarch64_handle_breakpoint (enum target_point_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_point_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_point_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 (debug_hw_points)
- 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;
-}
+/* Implementation of linux_target_ops method "insert_point".
-static int
-aarch64_handle_watchpoint (enum target_point_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);
-}
-
-/* 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.
-
- Return 0 if succeed;
- Return 1 if TYPE is unsupported type;
- Return -1 if an error occurs. */
+ the actual insertion will happen when threads are resumed. */
static int
-aarch64_insert_point (char type, CORE_ADDR addr, int len)
+aarch64_insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int len, struct raw_breakpoint *bp)
{
int ret;
- enum target_point_type targ_type;
+ enum target_hw_bp_type targ_type;
+ struct aarch64_debug_reg_state *state = aarch64_get_debug_reg_state ();
- if (debug_hw_points)
+ if (show_debug_regs)
fprintf (stderr, "insert_point on entry (addr=0x%08lx, len=%d)\n",
(unsigned long) addr, len);
- /* Determine the type from the packet. */
- targ_type = Z_packet_to_point_type (type);
- if (targ_type == point_type_unsupported)
- return 1;
+ /* Determine the type from the raw breakpoint type. */
+ 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 */);
+ aarch64_handle_watchpoint (targ_type, addr, len, 1 /* is_insert */,
+ state);
else
ret =
- aarch64_handle_breakpoint (targ_type, addr, len, 1 /* is_insert */);
+ aarch64_handle_breakpoint (targ_type, addr, len, 1 /* is_insert */,
+ state);
- if (debug_hw_points > 1)
+ if (show_debug_regs)
aarch64_show_debug_reg_state (aarch64_get_debug_reg_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 (char type, CORE_ADDR addr, int len)
+aarch64_remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
+ int len, struct raw_breakpoint *bp)
{
int ret;
- enum target_point_type targ_type;
+ enum target_hw_bp_type targ_type;
+ struct aarch64_debug_reg_state *state = aarch64_get_debug_reg_state ();
- if (debug_hw_points)
+ if (show_debug_regs)
fprintf (stderr, "remove_point on entry (addr=0x%08lx, len=%d)\n",
(unsigned long) addr, len);
- /* Determine the type from the packet. */
- targ_type = Z_packet_to_point_type (type);
- if (targ_type == point_type_unsupported)
- return 1;
+ /* Determine the type from the raw breakpoint type. */
+ targ_type = raw_bkpt_type_to_target_hw_bp_type (type);
/* 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 (debug_hw_points > 1)
+ if (show_debug_regs)
aarch64_show_debug_reg_state (aarch64_get_debug_reg_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)
int pid, i;
struct aarch64_debug_reg_state *state;
- pid = lwpid_of (get_thread_lwp (current_inferior));
+ pid = lwpid_of (current_thread);
/* Get the siginfo. */
if (ptrace (PTRACE_GETSIGINFO, pid, NULL, &siginfo) != 0)
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 "linux_new_process". */
static struct arch_process_info *
aarch64_linux_new_process (void)
return info;
}
-/* Called when a new thread is detected. */
+/* Implementation of linux_target_ops method "linux_new_thread". */
-static struct arch_lwp_info *
-aarch64_linux_new_thread (void)
+static void
+aarch64_linux_new_thread (struct lwp_info *lwp)
{
struct arch_lwp_info *info = xcalloc (1, sizeof (*info));
DR_MARK_ALL_CHANGED (info->dr_changed_bp, aarch64_num_bp_regs);
DR_MARK_ALL_CHANGED (info->dr_changed_wp, aarch64_num_wp_regs);
- return info;
+ lwp->arch_private = info;
+}
+
+/* Implementation of linux_target_ops method "linux_new_fork". */
+
+static void
+aarch64_linux_new_fork (struct process_info *parent,
+ struct process_info *child)
+{
+ /* 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);
+
+ /* 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.
+
+ 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. */
+
+ *child->priv->arch_private = *parent->priv->arch_private;
}
-/* Called when resuming a thread.
+/* Implementation of linux_target_ops method "linux_prepare_to_resume".
+
If the debug regs have changed, update the thread's copies. */
static void
aarch64_linux_prepare_to_resume (struct lwp_info *lwp)
{
- ptid_t ptid = ptid_of (lwp);
+ struct thread_info *thread = get_lwp_thread (lwp);
+ ptid_t ptid = ptid_of (thread);
struct arch_lwp_info *info = lwp->arch_private;
if (DR_HAS_CHANGED (info->dr_changed_bp)
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;
+ = &proc->priv->arch_private->debug_reg_state;
- if (debug_hw_points)
- fprintf (stderr, "prepare_to_resume thread %ld\n", lwpid_of (lwp));
+ if (show_debug_regs)
+ fprintf (stderr, "prepare_to_resume thread %ld\n", lwpid_of (thread));
/* Watchpoints. */
if (DR_HAS_CHANGED (info->dr_changed_wp))
}
}
-/* ptrace hardware breakpoint resource info is formatted as follows:
-
- 31 24 16 8 0
- +---------------+--------------+---------------+---------------+
- | RESERVED | RESERVED | DEBUG_ARCH | NUM_SLOTS |
- +---------------+--------------+---------------+---------------+ */
+/* Return the right target description according to the ELF file of
+ current thread. */
-#define AARCH64_DEBUG_NUM_SLOTS(x) ((x) & 0xff)
-#define AARCH64_DEBUG_ARCH(x) (((x) >> 8) & 0xff)
-#define AARCH64_DEBUG_ARCH_V8 0x6
-
-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 (get_thread_lwp (current_inferior));
- 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 */
+ NULL, /* 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