X-Git-Url: http://drtracing.org/?a=blobdiff_plain;ds=sidebyside;f=gdb%2Farm-linux-nat.c;h=d77ca9349849a07c8b18ab13f4a87fbb1f7412c0;hb=8b8c7c9f49992750f66f81b4601d593a3858d98c;hp=2c8cc0790218d2ae0dd784702d91a970d11e0854;hpb=ef57c0694247b8a89940320c89f49e237c153e31;p=deliverable%2Fbinutils-gdb.git
diff --git a/gdb/arm-linux-nat.c b/gdb/arm-linux-nat.c
index 2c8cc07902..d77ca93498 100644
--- a/gdb/arm-linux-nat.c
+++ b/gdb/arm-linux-nat.c
@@ -1,11 +1,11 @@
/* GNU/Linux on ARM native support.
- Copyright 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1999-2016 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
@@ -14,533 +14,1306 @@
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see . */
#include "defs.h"
#include "inferior.h"
#include "gdbcore.h"
-#include "gdb_string.h"
-
+#include "regcache.h"
+#include "target.h"
+#include "linux-nat.h"
+#include "target-descriptions.h"
+#include "auxv.h"
+#include "observer.h"
+#include "gdbthread.h"
+
+#include "arm-tdep.h"
+#include "arm-linux-tdep.h"
+#include "aarch32-linux-nat.h"
+
+#include
#include
-#include
+#include "nat/gdb_ptrace.h"
#include
+#include
+
+#include "nat/linux-ptrace.h"
+
+/* Prototypes for supply_gregset etc. */
+#include "gregset.h"
+
+/* Defines ps_err_e, struct ps_prochandle. */
+#include "gdb_proc_service.h"
+
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 22
+#endif
+
+#ifndef PTRACE_GETWMMXREGS
+#define PTRACE_GETWMMXREGS 18
+#define PTRACE_SETWMMXREGS 19
+#endif
+
+#ifndef PTRACE_GETVFPREGS
+#define PTRACE_GETVFPREGS 27
+#define PTRACE_SETVFPREGS 28
+#endif
+
+#ifndef PTRACE_GETHBPREGS
+#define PTRACE_GETHBPREGS 29
+#define PTRACE_SETHBPREGS 30
+#endif
extern int arm_apcs_32;
-#define typeNone 0x00
-#define typeSingle 0x01
-#define typeDouble 0x02
-#define typeExtended 0x03
-#define FPWORDS 28
-#define CPSR_REGNUM 16
-
-typedef union tagFPREG
- {
- unsigned int fSingle;
- unsigned int fDouble[2];
- unsigned int fExtended[3];
- }
-FPREG;
-
-typedef struct tagFPA11
- {
- FPREG fpreg[8]; /* 8 floating point registers */
- unsigned int fpsr; /* floating point status register */
- unsigned int fpcr; /* floating point control register */
- unsigned char fType[8]; /* type of floating point value held in
- floating point registers. */
- int initflag; /* NWFPE initialization flag. */
- }
-FPA11;
-
-/* The following variables are used to determine the version of the
- underlying Linux operating system. Examples:
-
- Linux 2.0.35 Linux 2.2.12
- os_version = 0x00020023 os_version = 0x0002020c
- os_major = 2 os_major = 2
- os_minor = 0 os_minor = 2
- os_release = 35 os_release = 12
-
- Note: os_version = (os_major << 16) | (os_minor << 8) | os_release
-
- These are initialized using get_linux_version() from
- _initialize_arm_linux_nat(). */
-
-static unsigned int os_version, os_major, os_minor, os_release;
+/* Get the whole floating point state of the process and store it
+ into regcache. */
static void
-fetch_nwfpe_single (unsigned int fn, FPA11 * fpa11)
+fetch_fpregs (struct regcache *regcache)
{
- unsigned int mem[3];
+ int ret, regno, tid;
+ gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
+
+ /* Get the thread id for the ptrace call. */
+ tid = ptid_get_lwp (inferior_ptid);
- mem[0] = fpa11->fpreg[fn].fSingle;
- mem[1] = 0;
- mem[2] = 0;
- supply_register (F0_REGNUM + fn, (char *) &mem[0]);
+ /* Read the floating point state. */
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ struct iovec iov;
+
+ iov.iov_base = &fp;
+ iov.iov_len = ARM_LINUX_SIZEOF_NWFPE;
+
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+
+ if (ret < 0)
+ perror_with_name (_("Unable to fetch the floating point registers."));
+
+ /* Fetch fpsr. */
+ regcache_raw_supply (regcache, ARM_FPS_REGNUM,
+ fp + NWFPE_FPSR_OFFSET);
+
+ /* Fetch the floating point registers. */
+ for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
+ supply_nwfpe_register (regcache, regno, fp);
}
+/* Save the whole floating point state of the process using
+ the contents from regcache. */
+
static void
-fetch_nwfpe_double (unsigned int fn, FPA11 * fpa11)
+store_fpregs (const struct regcache *regcache)
{
- unsigned int mem[3];
+ int ret, regno, tid;
+ gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
+
+ /* Get the thread id for the ptrace call. */
+ tid = ptid_get_lwp (inferior_ptid);
+
+ /* Read the floating point state. */
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ elf_fpregset_t fpregs;
+ struct iovec iov;
+
+ iov.iov_base = &fpregs;
+ iov.iov_len = sizeof (fpregs);
+
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PT_GETFPREGS, tid, 0, fp);
+
+ if (ret < 0)
+ perror_with_name (_("Unable to fetch the floating point registers."));
+
+ /* Store fpsr. */
+ if (REG_VALID == regcache_register_status (regcache, ARM_FPS_REGNUM))
+ regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);
+
+ /* Store the floating point registers. */
+ for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
+ if (REG_VALID == regcache_register_status (regcache, regno))
+ collect_nwfpe_register (regcache, regno, fp);
+
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ struct iovec iov;
+
+ iov.iov_base = &fp;
+ iov.iov_len = ARM_LINUX_SIZEOF_NWFPE;
+
+ ret = ptrace (PTRACE_SETREGSET, tid, NT_FPREGSET, &iov);
+ }
+ else
+ ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
- mem[0] = fpa11->fpreg[fn].fDouble[1];
- mem[1] = fpa11->fpreg[fn].fDouble[0];
- mem[2] = 0;
- supply_register (F0_REGNUM + fn, (char *) &mem[0]);
+ if (ret < 0)
+ perror_with_name (_("Unable to store floating point registers."));
}
+/* Fetch all general registers of the process and store into
+ regcache. */
+
static void
-fetch_nwfpe_none (unsigned int fn)
+fetch_regs (struct regcache *regcache)
{
- unsigned int mem[3] =
- {0, 0, 0};
+ int ret, regno, tid;
+ elf_gregset_t regs;
+
+ /* Get the thread id for the ptrace call. */
+ tid = ptid_get_lwp (inferior_ptid);
+
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ struct iovec iov;
+
+ iov.iov_base = ®s;
+ iov.iov_len = sizeof (regs);
+
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iov);
+ }
+ else
+ ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
- supply_register (F0_REGNUM + fn, (char *) &mem[0]);
+ if (ret < 0)
+ perror_with_name (_("Unable to fetch general registers."));
+
+ aarch32_gp_regcache_supply (regcache, (uint32_t *) regs, arm_apcs_32);
}
static void
-fetch_nwfpe_extended (unsigned int fn, FPA11 * fpa11)
+store_regs (const struct regcache *regcache)
{
- unsigned int mem[3];
+ int ret, regno, tid;
+ elf_gregset_t regs;
+
+ /* Get the thread id for the ptrace call. */
+ tid = ptid_get_lwp (inferior_ptid);
+
+ /* Fetch the general registers. */
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ struct iovec iov;
+
+ iov.iov_base = ®s;
+ iov.iov_len = sizeof (regs);
+
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iov);
+ }
+ else
+ ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
+
+ if (ret < 0)
+ perror_with_name (_("Unable to fetch general registers."));
+
+ aarch32_gp_regcache_collect (regcache, (uint32_t *) regs, arm_apcs_32);
+
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ struct iovec iov;
+
+ iov.iov_base = ®s;
+ iov.iov_len = sizeof (regs);
- mem[0] = fpa11->fpreg[fn].fExtended[0]; /* sign & exponent */
- mem[1] = fpa11->fpreg[fn].fExtended[2]; /* ls bits */
- mem[2] = fpa11->fpreg[fn].fExtended[1]; /* ms bits */
- supply_register (F0_REGNUM + fn, (char *) &mem[0]);
+ ret = ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, &iov);
+ }
+ else
+ ret = ptrace (PTRACE_SETREGS, tid, 0, ®s);
+
+ if (ret < 0)
+ perror_with_name (_("Unable to store general registers."));
}
+/* Fetch all WMMX registers of the process and store into
+ regcache. */
+
+#define IWMMXT_REGS_SIZE (16 * 8 + 6 * 4)
+
static void
-store_nwfpe_single (unsigned int fn, FPA11 * fpa11)
+fetch_wmmx_regs (struct regcache *regcache)
{
- unsigned int mem[3];
+ char regbuf[IWMMXT_REGS_SIZE];
+ int ret, regno, tid;
- read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
- fpa11->fpreg[fn].fSingle = mem[0];
- fpa11->fType[fn] = typeSingle;
+ /* Get the thread id for the ptrace call. */
+ tid = ptid_get_lwp (inferior_ptid);
+
+ ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
+ if (ret < 0)
+ perror_with_name (_("Unable to fetch WMMX registers."));
+
+ for (regno = 0; regno < 16; regno++)
+ regcache_raw_supply (regcache, regno + ARM_WR0_REGNUM,
+ ®buf[regno * 8]);
+
+ for (regno = 0; regno < 2; regno++)
+ regcache_raw_supply (regcache, regno + ARM_WCSSF_REGNUM,
+ ®buf[16 * 8 + regno * 4]);
+
+ for (regno = 0; regno < 4; regno++)
+ regcache_raw_supply (regcache, regno + ARM_WCGR0_REGNUM,
+ ®buf[16 * 8 + 2 * 4 + regno * 4]);
}
static void
-store_nwfpe_double (unsigned int fn, FPA11 * fpa11)
+store_wmmx_regs (const struct regcache *regcache)
{
- unsigned int mem[3];
+ char regbuf[IWMMXT_REGS_SIZE];
+ int ret, regno, tid;
- read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
- fpa11->fpreg[fn].fDouble[1] = mem[0];
- fpa11->fpreg[fn].fDouble[0] = mem[1];
- fpa11->fType[fn] = typeDouble;
-}
+ /* Get the thread id for the ptrace call. */
+ tid = ptid_get_lwp (inferior_ptid);
-void
-store_nwfpe_extended (unsigned int fn, FPA11 * fpa11)
-{
- unsigned int mem[3];
+ ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
+ if (ret < 0)
+ perror_with_name (_("Unable to fetch WMMX registers."));
- read_register_gen (F0_REGNUM + fn, (char *) &mem[0]);
- fpa11->fpreg[fn].fExtended[0] = mem[0]; /* sign & exponent */
- fpa11->fpreg[fn].fExtended[2] = mem[1]; /* ls bits */
- fpa11->fpreg[fn].fExtended[1] = mem[2]; /* ms bits */
- fpa11->fType[fn] = typeDouble;
-}
+ for (regno = 0; regno < 16; regno++)
+ if (REG_VALID == regcache_register_status (regcache,
+ regno + ARM_WR0_REGNUM))
+ regcache_raw_collect (regcache, regno + ARM_WR0_REGNUM,
+ ®buf[regno * 8]);
-/* Get the whole floating point state of the process and store the
- floating point stack into registers[]. */
+ for (regno = 0; regno < 2; regno++)
+ if (REG_VALID == regcache_register_status (regcache,
+ regno + ARM_WCSSF_REGNUM))
+ regcache_raw_collect (regcache, regno + ARM_WCSSF_REGNUM,
+ ®buf[16 * 8 + regno * 4]);
+
+ for (regno = 0; regno < 4; regno++)
+ if (REG_VALID == regcache_register_status (regcache,
+ regno + ARM_WCGR0_REGNUM))
+ regcache_raw_collect (regcache, regno + ARM_WCGR0_REGNUM,
+ ®buf[16 * 8 + 2 * 4 + regno * 4]);
+
+ ret = ptrace (PTRACE_SETWMMXREGS, tid, 0, regbuf);
+
+ if (ret < 0)
+ perror_with_name (_("Unable to store WMMX registers."));
+}
static void
-fetch_fpregs (void)
+fetch_vfp_regs (struct regcache *regcache)
{
- int ret, regno;
- FPA11 fp;
+ gdb_byte regbuf[VFP_REGS_SIZE];
+ int ret, regno, tid;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Read the floating point state. */
- ret = ptrace (PT_GETFPREGS, inferior_pid, 0, &fp);
- if (ret < 0)
+ /* Get the thread id for the ptrace call. */
+ tid = ptid_get_lwp (inferior_ptid);
+
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
{
- warning ("Unable to fetch the floating point state.");
- return;
+ struct iovec iov;
+
+ iov.iov_base = regbuf;
+ iov.iov_len = VFP_REGS_SIZE;
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iov);
}
+ else
+ ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf);
- /* Fetch fpsr. */
- supply_register (FPS_REGNUM, (char *) &fp.fpsr);
+ if (ret < 0)
+ perror_with_name (_("Unable to fetch VFP registers."));
- /* Fetch the floating point registers. */
- for (regno = F0_REGNUM; regno <= F7_REGNUM; regno++)
+ aarch32_vfp_regcache_supply (regcache, regbuf,
+ tdep->vfp_register_count);
+}
+
+static void
+store_vfp_regs (const struct regcache *regcache)
+{
+ gdb_byte regbuf[VFP_REGS_SIZE];
+ int ret, regno, tid;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* Get the thread id for the ptrace call. */
+ tid = ptid_get_lwp (inferior_ptid);
+
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
{
- int fn = regno - F0_REGNUM;
- unsigned int *p = (unsigned int *) ®isters[REGISTER_BYTE (regno)];
+ struct iovec iov;
- switch (fp.fType[fn])
- {
- case typeSingle:
- fetch_nwfpe_single (fn, &fp);
- break;
+ iov.iov_base = regbuf;
+ iov.iov_len = VFP_REGS_SIZE;
+ ret = ptrace (PTRACE_GETREGSET, tid, NT_ARM_VFP, &iov);
+ }
+ else
+ ret = ptrace (PTRACE_GETVFPREGS, tid, 0, regbuf);
+
+ if (ret < 0)
+ perror_with_name (_("Unable to fetch VFP registers (for update)."));
- case typeDouble:
- fetch_nwfpe_double (fn, &fp);
- break;
+ aarch32_vfp_regcache_collect (regcache, regbuf,
+ tdep->vfp_register_count);
- case typeExtended:
- fetch_nwfpe_extended (fn, &fp);
- break;
+ if (have_ptrace_getregset == TRIBOOL_TRUE)
+ {
+ struct iovec iov;
- default:
- fetch_nwfpe_none (fn);
- }
+ iov.iov_base = regbuf;
+ iov.iov_len = VFP_REGS_SIZE;
+ ret = ptrace (PTRACE_SETREGSET, tid, NT_ARM_VFP, &iov);
}
+ else
+ ret = ptrace (PTRACE_SETVFPREGS, tid, 0, regbuf);
+
+ if (ret < 0)
+ perror_with_name (_("Unable to store VFP registers."));
}
-/* Save the whole floating point state of the process using
- the contents from registers[]. */
+/* Fetch registers from the child process. Fetch all registers if
+ regno == -1, otherwise fetch all general registers or all floating
+ point registers depending upon the value of regno. */
static void
-store_fpregs (void)
+arm_linux_fetch_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
{
- int ret, regno;
- FPA11 fp;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* Store fpsr. */
- if (register_valid[FPS_REGNUM])
- read_register_gen (FPS_REGNUM, (char *) &fp.fpsr);
-
- /* Store the floating point registers. */
- for (regno = F0_REGNUM; regno <= F7_REGNUM; regno++)
+ if (-1 == regno)
{
- if (register_valid[regno])
- {
- unsigned int fn = regno - F0_REGNUM;
- switch (fp.fType[fn])
- {
- case typeSingle:
- store_nwfpe_single (fn, &fp);
- break;
-
- case typeDouble:
- store_nwfpe_double (fn, &fp);
- break;
-
- case typeExtended:
- store_nwfpe_extended (fn, &fp);
- break;
- }
- }
+ fetch_regs (regcache);
+ fetch_fpregs (regcache);
+ if (tdep->have_wmmx_registers)
+ fetch_wmmx_regs (regcache);
+ if (tdep->vfp_register_count > 0)
+ fetch_vfp_regs (regcache);
}
-
- ret = ptrace (PTRACE_SETFPREGS, inferior_pid, 0, &fp);
- if (ret < 0)
+ else
{
- warning ("Unable to store floating point state.");
- return;
+ if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)
+ fetch_regs (regcache);
+ else if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM)
+ fetch_fpregs (regcache);
+ else if (tdep->have_wmmx_registers
+ && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)
+ fetch_wmmx_regs (regcache);
+ else if (tdep->vfp_register_count > 0
+ && regno >= ARM_D0_REGNUM
+ && regno <= ARM_D0_REGNUM + tdep->vfp_register_count)
+ fetch_vfp_regs (regcache);
}
}
-/* Fetch all general registers of the process and store into
- registers[]. */
+/* Store registers back into the inferior. Store all registers if
+ regno == -1, otherwise store all general registers or all floating
+ point registers depending upon the value of regno. */
static void
-fetch_regs (void)
+arm_linux_store_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regno)
{
- int ret, regno;
- struct pt_regs regs;
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, ®s);
- if (ret < 0)
+ if (-1 == regno)
{
- warning ("Unable to fetch general registers.");
- return;
+ store_regs (regcache);
+ store_fpregs (regcache);
+ if (tdep->have_wmmx_registers)
+ store_wmmx_regs (regcache);
+ if (tdep->vfp_register_count > 0)
+ store_vfp_regs (regcache);
}
+ else
+ {
+ if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)
+ store_regs (regcache);
+ else if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM))
+ store_fpregs (regcache);
+ else if (tdep->have_wmmx_registers
+ && regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)
+ store_wmmx_regs (regcache);
+ else if (tdep->vfp_register_count > 0
+ && regno >= ARM_D0_REGNUM
+ && regno <= ARM_D0_REGNUM + tdep->vfp_register_count)
+ store_vfp_regs (regcache);
+ }
+}
- for (regno = A1_REGNUM; regno < PC_REGNUM; regno++)
- supply_register (regno, (char *) ®s.uregs[regno]);
+/* Wrapper functions for the standard regset handling, used by
+ thread debugging. */
- if (arm_apcs_32)
- supply_register (PS_REGNUM, (char *) ®s.uregs[CPSR_REGNUM]);
- else
- supply_register (PS_REGNUM, (char *) ®s.uregs[PC_REGNUM]);
+void
+fill_gregset (const struct regcache *regcache,
+ gdb_gregset_t *gregsetp, int regno)
+{
+ arm_linux_collect_gregset (NULL, regcache, regno, gregsetp, 0);
+}
+
+void
+supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
+{
+ arm_linux_supply_gregset (NULL, regcache, -1, gregsetp, 0);
+}
- regs.uregs[PC_REGNUM] = ADDR_BITS_REMOVE (regs.uregs[PC_REGNUM]);
- supply_register (PC_REGNUM, (char *) ®s.uregs[PC_REGNUM]);
+void
+fill_fpregset (const struct regcache *regcache,
+ gdb_fpregset_t *fpregsetp, int regno)
+{
+ arm_linux_collect_nwfpe (NULL, regcache, regno, fpregsetp, 0);
}
-/* Store all general registers of the process from the values in
- registers[]. */
+/* Fill GDB's register array with the floating-point register values
+ in *fpregsetp. */
-static void
-store_regs (void)
+void
+supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
{
- int ret, regno;
- struct pt_regs regs;
+ arm_linux_supply_nwfpe (NULL, regcache, -1, fpregsetp, 0);
+}
- ret = ptrace (PTRACE_GETREGS, inferior_pid, 0, ®s);
- if (ret < 0)
+/* Fetch the thread-local storage pointer for libthread_db. */
+
+ps_err_e
+ps_get_thread_area (const struct ps_prochandle *ph,
+ lwpid_t lwpid, int idx, void **base)
+{
+ if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
+ return PS_ERR;
+
+ /* IDX is the bias from the thread pointer to the beginning of the
+ thread descriptor. It has to be subtracted due to implementation
+ quirks in libthread_db. */
+ *base = (void *) ((char *)*base - idx);
+
+ return PS_OK;
+}
+
+static const struct target_desc *
+arm_linux_read_description (struct target_ops *ops)
+{
+ CORE_ADDR arm_hwcap = 0;
+
+ if (have_ptrace_getregset == TRIBOOL_UNKNOWN)
{
- warning ("Unable to fetch general registers.");
- return;
+ elf_gregset_t gpregs;
+ struct iovec iov;
+ int tid = ptid_get_lwp (inferior_ptid);
+
+ iov.iov_base = &gpregs;
+ iov.iov_len = sizeof (gpregs);
+
+ /* Check if PTRACE_GETREGSET works. */
+ if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iov) < 0)
+ have_ptrace_getregset = TRIBOOL_FALSE;
+ else
+ have_ptrace_getregset = TRIBOOL_TRUE;
}
- for (regno = A1_REGNUM; regno <= PC_REGNUM; regno++)
+ if (target_auxv_search (ops, AT_HWCAP, &arm_hwcap) != 1)
{
- if (register_valid[regno])
- read_register_gen (regno, (char *) ®s.uregs[regno]);
+ return ops->beneath->to_read_description (ops->beneath);
}
- ret = ptrace (PTRACE_SETREGS, inferior_pid, 0, ®s);
+ if (arm_hwcap & HWCAP_IWMMXT)
+ return tdesc_arm_with_iwmmxt;
- if (ret < 0)
+ if (arm_hwcap & HWCAP_VFP)
{
- warning ("Unable to store general registers.");
- return;
+ int pid;
+ char *buf;
+ const struct target_desc * result = NULL;
+
+ /* NEON implies VFPv3-D32 or no-VFP unit. Say that we only support
+ Neon with VFPv3-D32. */
+ if (arm_hwcap & HWCAP_NEON)
+ result = tdesc_arm_with_neon;
+ else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPv3D16)) == HWCAP_VFPv3)
+ result = tdesc_arm_with_vfpv3;
+ else
+ result = tdesc_arm_with_vfpv2;
+
+ /* Now make sure that the kernel supports reading these
+ registers. Support was added in 2.6.30. */
+ pid = ptid_get_lwp (inferior_ptid);
+ errno = 0;
+ buf = (char *) alloca (VFP_REGS_SIZE);
+ if (ptrace (PTRACE_GETVFPREGS, pid, 0, buf) < 0
+ && errno == EIO)
+ result = NULL;
+
+ return result;
}
+
+ return ops->beneath->to_read_description (ops->beneath);
}
-/* Fetch registers from the child process. Fetch all registers if
- regno == -1, otherwise fetch all general registers or all floating
- point registers depending upon the value of regno. */
+/* Information describing the hardware breakpoint capabilities. */
+struct arm_linux_hwbp_cap
+{
+ gdb_byte arch;
+ gdb_byte max_wp_length;
+ gdb_byte wp_count;
+ gdb_byte bp_count;
+};
+
+/* Since we cannot dynamically allocate subfields of arm_linux_process_info,
+ assume a maximum number of supported break-/watchpoints. */
+#define MAX_BPTS 16
+#define MAX_WPTS 16
+
+/* Get hold of the Hardware Breakpoint information for the target we are
+ attached to. Returns NULL if the kernel doesn't support Hardware
+ breakpoints at all, or a pointer to the information structure. */
+static const struct arm_linux_hwbp_cap *
+arm_linux_get_hwbp_cap (void)
+{
+ /* The info structure we return. */
+ static struct arm_linux_hwbp_cap info;
-void
-fetch_inferior_registers (int regno)
+ /* Is INFO in a good state? -1 means that no attempt has been made to
+ initialize INFO; 0 means an attempt has been made, but it failed; 1
+ means INFO is in an initialized state. */
+ static int available = -1;
+
+ if (available == -1)
+ {
+ int tid;
+ unsigned int val;
+
+ tid = ptid_get_lwp (inferior_ptid);
+ if (ptrace (PTRACE_GETHBPREGS, tid, 0, &val) < 0)
+ available = 0;
+ else
+ {
+ info.arch = (gdb_byte)((val >> 24) & 0xff);
+ info.max_wp_length = (gdb_byte)((val >> 16) & 0xff);
+ info.wp_count = (gdb_byte)((val >> 8) & 0xff);
+ info.bp_count = (gdb_byte)(val & 0xff);
+
+ if (info.wp_count > MAX_WPTS)
+ {
+ warning (_("arm-linux-gdb supports %d hardware watchpoints but target \
+ supports %d"), MAX_WPTS, info.wp_count);
+ info.wp_count = MAX_WPTS;
+ }
+
+ if (info.bp_count > MAX_BPTS)
+ {
+ warning (_("arm-linux-gdb supports %d hardware breakpoints but target \
+ supports %d"), MAX_BPTS, info.bp_count);
+ info.bp_count = MAX_BPTS;
+ }
+ available = (info.arch != 0);
+ }
+ }
+
+ return available == 1 ? &info : NULL;
+}
+
+/* How many hardware breakpoints are available? */
+static int
+arm_linux_get_hw_breakpoint_count (void)
{
- if ((regno < F0_REGNUM) || (regno > FPS_REGNUM))
- fetch_regs ();
+ const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
+ return cap != NULL ? cap->bp_count : 0;
+}
- if (((regno >= F0_REGNUM) && (regno <= FPS_REGNUM)) || (regno == -1))
- fetch_fpregs ();
+/* How many hardware watchpoints are available? */
+static int
+arm_linux_get_hw_watchpoint_count (void)
+{
+ const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
+ return cap != NULL ? cap->wp_count : 0;
}
-/* Store registers back into the inferior. Store all registers if
- regno == -1, otherwise store all general registers or all floating
- point registers depending upon the value of regno. */
+/* Have we got a free break-/watch-point available for use? Returns -1 if
+ there is not an appropriate resource available, otherwise returns 1. */
+static int
+arm_linux_can_use_hw_breakpoint (struct target_ops *self,
+ enum bptype type,
+ int cnt, int ot)
+{
+ if (type == bp_hardware_watchpoint || type == bp_read_watchpoint
+ || type == bp_access_watchpoint || type == bp_watchpoint)
+ {
+ int count = arm_linux_get_hw_watchpoint_count ();
-void
-store_inferior_registers (int regno)
+ if (count == 0)
+ return 0;
+ else if (cnt + ot > count)
+ return -1;
+ }
+ else if (type == bp_hardware_breakpoint)
+ {
+ int count = arm_linux_get_hw_breakpoint_count ();
+
+ if (count == 0)
+ return 0;
+ else if (cnt > count)
+ return -1;
+ }
+ else
+ gdb_assert (FALSE);
+
+ return 1;
+}
+
+/* Enum describing the different types of ARM hardware break-/watch-points. */
+typedef enum
+{
+ arm_hwbp_break = 0,
+ arm_hwbp_load = 1,
+ arm_hwbp_store = 2,
+ arm_hwbp_access = 3
+} arm_hwbp_type;
+
+/* Type describing an ARM Hardware Breakpoint Control register value. */
+typedef unsigned int arm_hwbp_control_t;
+
+/* Structure used to keep track of hardware break-/watch-points. */
+struct arm_linux_hw_breakpoint
+{
+ /* Address to break on, or being watched. */
+ unsigned int address;
+ /* Control register for break-/watch- point. */
+ arm_hwbp_control_t control;
+};
+
+/* Structure containing arrays of per process hardware break-/watchpoints
+ for caching address and control information.
+
+ The Linux ptrace interface to hardware break-/watch-points presents the
+ values in a vector centred around 0 (which is used fo generic information).
+ Positive indicies refer to breakpoint addresses/control registers, negative
+ indices to watchpoint addresses/control registers.
+
+ The Linux vector is indexed as follows:
+ -((i << 1) + 2): Control register for watchpoint i.
+ -((i << 1) + 1): Address register for watchpoint i.
+ 0: Information register.
+ ((i << 1) + 1): Address register for breakpoint i.
+ ((i << 1) + 2): Control register for breakpoint i.
+
+ This structure is used as a per-thread cache of the state stored by the
+ kernel, so that we don't need to keep calling into the kernel to find a
+ free breakpoint.
+
+ We treat break-/watch-points with their enable bit clear as being deleted.
+ */
+struct arm_linux_debug_reg_state
+{
+ /* Hardware breakpoints for this process. */
+ struct arm_linux_hw_breakpoint bpts[MAX_BPTS];
+ /* Hardware watchpoints for this process. */
+ struct arm_linux_hw_breakpoint wpts[MAX_WPTS];
+};
+
+/* Per-process arch-specific data we want to keep. */
+struct arm_linux_process_info
+{
+ /* Linked list. */
+ struct arm_linux_process_info *next;
+ /* The process identifier. */
+ pid_t pid;
+ /* Hardware break-/watchpoints state information. */
+ struct arm_linux_debug_reg_state state;
+
+};
+
+/* Per-thread arch-specific data we want to keep. */
+struct arch_lwp_info
+{
+ /* Non-zero if our copy differs from what's recorded in the thread. */
+ char bpts_changed[MAX_BPTS];
+ char wpts_changed[MAX_WPTS];
+};
+
+static struct arm_linux_process_info *arm_linux_process_list = NULL;
+
+/* Find process data for process PID. */
+
+static struct arm_linux_process_info *
+arm_linux_find_process_pid (pid_t pid)
+{
+ struct arm_linux_process_info *proc;
+
+ for (proc = arm_linux_process_list; proc; proc = proc->next)
+ if (proc->pid == pid)
+ return proc;
+
+ return NULL;
+}
+
+/* Add process data for process PID. Returns newly allocated info
+ object. */
+
+static struct arm_linux_process_info *
+arm_linux_add_process (pid_t pid)
{
- if ((regno < F0_REGNUM) || (regno > FPS_REGNUM))
- store_regs ();
+ struct arm_linux_process_info *proc;
+
+ proc = XCNEW (struct arm_linux_process_info);
+ proc->pid = pid;
- if (((regno >= F0_REGNUM) && (regno <= FPS_REGNUM)) || (regno == -1))
- store_fpregs ();
+ proc->next = arm_linux_process_list;
+ arm_linux_process_list = proc;
+
+ return proc;
}
-#ifdef GET_LONGJMP_TARGET
+/* Get data specific info for process PID, creating it if necessary.
+ Never returns NULL. */
-/* Figure out where the longjmp will land. We expect that we have
- just entered longjmp and haven't yet altered r0, r1, so the
- arguments are still in the registers. (A1_REGNUM) points at the
- jmp_buf structure from which we extract the pc (JB_PC) that we will
- land at. The pc is copied into ADDR. This routine returns true on
- success. */
+static struct arm_linux_process_info *
+arm_linux_process_info_get (pid_t pid)
+{
+ struct arm_linux_process_info *proc;
-#define LONGJMP_TARGET_SIZE sizeof(int)
-#define JB_ELEMENT_SIZE sizeof(int)
-#define JB_SL 18
-#define JB_FP 19
-#define JB_SP 20
-#define JB_PC 21
+ proc = arm_linux_find_process_pid (pid);
+ if (proc == NULL)
+ proc = arm_linux_add_process (pid);
-int
-arm_get_longjmp_target (CORE_ADDR * pc)
+ return proc;
+}
+
+/* Called whenever GDB is no longer debugging process PID. It deletes
+ data structures that keep track of debug register state. */
+
+static void
+arm_linux_forget_process (pid_t pid)
{
- CORE_ADDR jb_addr;
- char buf[LONGJMP_TARGET_SIZE];
+ struct arm_linux_process_info *proc, **proc_link;
- jb_addr = read_register (A1_REGNUM);
+ proc = arm_linux_process_list;
+ proc_link = &arm_linux_process_list;
- if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
- LONGJMP_TARGET_SIZE))
- return 0;
+ while (proc != NULL)
+ {
+ if (proc->pid == pid)
+ {
+ *proc_link = proc->next;
- *pc = extract_address (buf, LONGJMP_TARGET_SIZE);
- return 1;
+ xfree (proc);
+ return;
+ }
+
+ proc_link = &proc->next;
+ proc = *proc_link;
+ }
}
-#endif /* GET_LONGJMP_TARGET */
+/* Get hardware break-/watchpoint state for process PID. */
-/*
- Dynamic Linking on ARM Linux
- ----------------------------
+static struct arm_linux_debug_reg_state *
+arm_linux_get_debug_reg_state (pid_t pid)
+{
+ return &arm_linux_process_info_get (pid)->state;
+}
- Note: PLT = procedure linkage table
- GOT = global offset table
+/* Initialize an ARM hardware break-/watch-point control register value.
+ BYTE_ADDRESS_SELECT is the mask of bytes to trigger on; HWBP_TYPE is the
+ type of break-/watch-point; ENABLE indicates whether the point is enabled.
+ */
+static arm_hwbp_control_t
+arm_hwbp_control_initialize (unsigned byte_address_select,
+ arm_hwbp_type hwbp_type,
+ int enable)
+{
+ gdb_assert ((byte_address_select & ~0xffU) == 0);
+ gdb_assert (hwbp_type != arm_hwbp_break
+ || ((byte_address_select & 0xfU) != 0));
- As much as possible, ELF dynamic linking defers the resolution of
- jump/call addresses until the last minute. The technique used is
- inspired by the i386 ELF design, and is based on the following
- constraints.
+ return (byte_address_select << 5) | (hwbp_type << 3) | (3 << 1) | enable;
+}
- 1) The calling technique should not force a change in the assembly
- code produced for apps; it MAY cause changes in the way assembly
- code is produced for position independent code (i.e. shared
- libraries).
+/* Does the breakpoint control value CONTROL have the enable bit set? */
+static int
+arm_hwbp_control_is_enabled (arm_hwbp_control_t control)
+{
+ return control & 0x1;
+}
- 2) The technique must be such that all executable areas must not be
- modified; and any modified areas must not be executed.
+/* Change a breakpoint control word so that it is in the disabled state. */
+static arm_hwbp_control_t
+arm_hwbp_control_disable (arm_hwbp_control_t control)
+{
+ return control & ~0x1;
+}
- To do this, there are three steps involved in a typical jump:
+/* Initialise the hardware breakpoint structure P. The breakpoint will be
+ enabled, and will point to the placed address of BP_TGT. */
+static void
+arm_linux_hw_breakpoint_initialize (struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt,
+ struct arm_linux_hw_breakpoint *p)
+{
+ unsigned mask;
+ CORE_ADDR address = bp_tgt->placed_address = bp_tgt->reqstd_address;
- 1) in the code
- 2) through the PLT
- 3) using a pointer from the GOT
+ /* We have to create a mask for the control register which says which bits
+ of the word pointed to by address to break on. */
+ if (arm_pc_is_thumb (gdbarch, address))
+ {
+ mask = 0x3;
+ address &= ~1;
+ }
+ else
+ {
+ mask = 0xf;
+ address &= ~3;
+ }
- When the executable or library is first loaded, each GOT entry is
- initialized to point to the code which implements dynamic name
- resolution and code finding. This is normally a function in the
- program interpreter (on ARM Linux this is usually ld-linux.so.2,
- but it does not have to be). On the first invocation, the function
- is located and the GOT entry is replaced with the real function
- address. Subsequent calls go through steps 1, 2 and 3 and end up
- calling the real code.
+ p->address = (unsigned int) address;
+ p->control = arm_hwbp_control_initialize (mask, arm_hwbp_break, 1);
+}
- 1) In the code:
+/* Get the ARM hardware breakpoint type from the TYPE value we're
+ given when asked to set a watchpoint. */
+static arm_hwbp_type
+arm_linux_get_hwbp_type (enum target_hw_bp_type type)
+{
+ if (type == hw_read)
+ return arm_hwbp_load;
+ else if (type == hw_write)
+ return arm_hwbp_store;
+ else
+ return arm_hwbp_access;
+}
- b function_call
- bl function_call
+/* Initialize the hardware breakpoint structure P for a watchpoint at ADDR
+ to LEN. The type of watchpoint is given in RW. */
+static void
+arm_linux_hw_watchpoint_initialize (CORE_ADDR addr, int len,
+ enum target_hw_bp_type type,
+ struct arm_linux_hw_breakpoint *p)
+{
+ const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
+ unsigned mask;
- This is typical ARM code using the 26 bit relative branch or branch
- and link instructions. The target of the instruction
- (function_call is usually the address of the function to be called.
- In position independent code, the target of the instruction is
- actually an entry in the PLT when calling functions in a shared
- library. Note that this call is identical to a normal function
- call, only the target differs.
+ gdb_assert (cap != NULL);
+ gdb_assert (cap->max_wp_length != 0);
- 2) In the PLT:
+ mask = (1 << len) - 1;
- The PLT is a synthetic area, created by the linker. It exists in
- both executables and libraries. It is an array of stubs, one per
- imported function call. It looks like this:
+ p->address = (unsigned int) addr;
+ p->control = arm_hwbp_control_initialize (mask,
+ arm_linux_get_hwbp_type (type), 1);
+}
- PLT[0]:
- str lr, [sp, #-4]! @push the return address (lr)
- ldr lr, [pc, #16] @load from 6 words ahead
- add lr, pc, lr @form an address for GOT[0]
- ldr pc, [lr, #8]! @jump to the contents of that addr
+/* Are two break-/watch-points equal? */
+static int
+arm_linux_hw_breakpoint_equal (const struct arm_linux_hw_breakpoint *p1,
+ const struct arm_linux_hw_breakpoint *p2)
+{
+ return p1->address == p2->address && p1->control == p2->control;
+}
- The return address (lr) is pushed on the stack and used for
- calculations. The load on the second line loads the lr with
- &GOT[3] - . - 20. The addition on the third leaves:
+/* Callback to mark a watch-/breakpoint to be updated in all threads of
+ the current process. */
- lr = (&GOT[3] - . - 20) + (. + 8)
- lr = (&GOT[3] - 12)
- lr = &GOT[0]
+struct update_registers_data
+{
+ int watch;
+ int index;
+};
- On the fourth line, the pc and lr are both updated, so that:
+static int
+update_registers_callback (struct lwp_info *lwp, void *arg)
+{
+ struct update_registers_data *data = (struct update_registers_data *) arg;
- pc = GOT[2]
- lr = &GOT[0] + 8
- = &GOT[2]
+ if (lwp->arch_private == NULL)
+ lwp->arch_private = XCNEW (struct arch_lwp_info);
- NOTE: PLT[0] borrows an offset .word from PLT[1]. This is a little
- "tight", but allows us to keep all the PLT entries the same size.
+ /* The actual update is done later just before resuming the lwp,
+ we just mark that the registers need updating. */
+ if (data->watch)
+ lwp->arch_private->wpts_changed[data->index] = 1;
+ else
+ lwp->arch_private->bpts_changed[data->index] = 1;
- PLT[n+1]:
- ldr ip, [pc, #4] @load offset from gotoff
- add ip, pc, ip @add the offset to the pc
- ldr pc, [ip] @jump to that address
- gotoff: .word GOT[n+3] - .
+ /* If the lwp isn't stopped, force it to momentarily pause, so
+ we can update its breakpoint registers. */
+ if (!lwp->stopped)
+ linux_stop_lwp (lwp);
- The load on the first line, gets an offset from the fourth word of
- the PLT entry. The add on the second line makes ip = &GOT[n+3],
- which contains either a pointer to PLT[0] (the fixup trampoline) or
- a pointer to the actual code.
+ return 0;
+}
- 3) In the GOT:
+/* Insert the hardware breakpoint (WATCHPOINT = 0) or watchpoint (WATCHPOINT
+ =1) BPT for thread TID. */
+static void
+arm_linux_insert_hw_breakpoint1 (const struct arm_linux_hw_breakpoint* bpt,
+ int watchpoint)
+{
+ int pid;
+ ptid_t pid_ptid;
+ gdb_byte count, i;
+ struct arm_linux_hw_breakpoint* bpts;
+ struct update_registers_data data;
- The GOT contains helper pointers for both code (PLT) fixups and
- data fixups. The first 3 entries of the GOT are special. The next
- M entries (where M is the number of entries in the PLT) belong to
- the PLT fixups. The next D (all remaining) entries belong to
- various data fixups. The actual size of the GOT is 3 + M + D.
+ pid = ptid_get_pid (inferior_ptid);
+ pid_ptid = pid_to_ptid (pid);
- The GOT is also a synthetic area, created by the linker. It exists
- in both executables and libraries. When the GOT is first
- initialized , all the GOT entries relating to PLT fixups are
- pointing to code back at PLT[0].
+ if (watchpoint)
+ {
+ count = arm_linux_get_hw_watchpoint_count ();
+ bpts = arm_linux_get_debug_reg_state (pid)->wpts;
+ }
+ else
+ {
+ count = arm_linux_get_hw_breakpoint_count ();
+ bpts = arm_linux_get_debug_reg_state (pid)->bpts;
+ }
- The special entries in the GOT are:
+ for (i = 0; i < count; ++i)
+ if (!arm_hwbp_control_is_enabled (bpts[i].control))
+ {
+ data.watch = watchpoint;
+ data.index = i;
+ bpts[i] = *bpt;
+ iterate_over_lwps (pid_ptid, update_registers_callback, &data);
+ break;
+ }
+
+ gdb_assert (i != count);
+}
- GOT[0] = linked list pointer used by the dynamic loader
- GOT[1] = pointer to the reloc table for this module
- GOT[2] = pointer to the fixup/resolver code
+/* Remove the hardware breakpoint (WATCHPOINT = 0) or watchpoint
+ (WATCHPOINT = 1) BPT for thread TID. */
+static void
+arm_linux_remove_hw_breakpoint1 (const struct arm_linux_hw_breakpoint *bpt,
+ int watchpoint)
+{
+ int pid;
+ gdb_byte count, i;
+ ptid_t pid_ptid;
+ struct arm_linux_hw_breakpoint* bpts;
+ struct update_registers_data data;
- The first invocation of function call comes through and uses the
- fixup/resolver code. On the entry to the fixup/resolver code:
+ pid = ptid_get_pid (inferior_ptid);
+ pid_ptid = pid_to_ptid (pid);
- ip = &GOT[n+3]
- lr = &GOT[2]
- stack[0] = return address (lr) of the function call
- [r0, r1, r2, r3] are still the arguments to the function call
+ if (watchpoint)
+ {
+ count = arm_linux_get_hw_watchpoint_count ();
+ bpts = arm_linux_get_debug_reg_state (pid)->wpts;
+ }
+ else
+ {
+ count = arm_linux_get_hw_breakpoint_count ();
+ bpts = arm_linux_get_debug_reg_state (pid)->bpts;
+ }
- This is enough information for the fixup/resolver code to work
- with. Before the fixup/resolver code returns, it actually calls
- the requested function and repairs &GOT[n+3]. */
+ for (i = 0; i < count; ++i)
+ if (arm_linux_hw_breakpoint_equal (bpt, bpts + i))
+ {
+ data.watch = watchpoint;
+ data.index = i;
+ bpts[i].control = arm_hwbp_control_disable (bpts[i].control);
+ iterate_over_lwps (pid_ptid, update_registers_callback, &data);
+ break;
+ }
+
+ gdb_assert (i != count);
+}
-CORE_ADDR
-arm_skip_solib_resolver (CORE_ADDR pc)
+/* Insert a Hardware breakpoint. */
+static int
+arm_linux_insert_hw_breakpoint (struct target_ops *self,
+ struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
{
- /* FIXME */
+ struct lwp_info *lp;
+ struct arm_linux_hw_breakpoint p;
+
+ if (arm_linux_get_hw_breakpoint_count () == 0)
+ return -1;
+
+ arm_linux_hw_breakpoint_initialize (gdbarch, bp_tgt, &p);
+
+ arm_linux_insert_hw_breakpoint1 (&p, 0);
+
return 0;
}
-int
-arm_linux_register_u_addr (int blockend, int regnum)
+/* Remove a hardware breakpoint. */
+static int
+arm_linux_remove_hw_breakpoint (struct target_ops *self,
+ struct gdbarch *gdbarch,
+ struct bp_target_info *bp_tgt)
{
- return blockend + REGISTER_BYTE (regnum);
+ struct lwp_info *lp;
+ struct arm_linux_hw_breakpoint p;
+
+ if (arm_linux_get_hw_breakpoint_count () == 0)
+ return -1;
+
+ arm_linux_hw_breakpoint_initialize (gdbarch, bp_tgt, &p);
+
+ arm_linux_remove_hw_breakpoint1 (&p, 0);
+
+ return 0;
}
-int
-arm_linux_kernel_u_size (void)
+/* Are we able to use a hardware watchpoint for the LEN bytes starting at
+ ADDR? */
+static int
+arm_linux_region_ok_for_hw_watchpoint (struct target_ops *self,
+ CORE_ADDR addr, int len)
{
- return (sizeof (struct user));
+ const struct arm_linux_hwbp_cap *cap = arm_linux_get_hwbp_cap ();
+ CORE_ADDR max_wp_length, aligned_addr;
+
+ /* Can not set watchpoints for zero or negative lengths. */
+ if (len <= 0)
+ return 0;
+
+ /* Need to be able to use the ptrace interface. */
+ if (cap == NULL || cap->wp_count == 0)
+ return 0;
+
+ /* Test that the range [ADDR, ADDR + LEN) fits into the largest address
+ range covered by a watchpoint. */
+ max_wp_length = (CORE_ADDR)cap->max_wp_length;
+ aligned_addr = addr & ~(max_wp_length - 1);
+
+ if (aligned_addr + max_wp_length < addr + len)
+ return 0;
+
+ /* The current ptrace interface can only handle watchpoints that are a
+ power of 2. */
+ if ((len & (len - 1)) != 0)
+ return 0;
+
+ /* All tests passed so we must be able to set a watchpoint. */
+ return 1;
}
-/* Extract from an array REGBUF containing the (raw) register state
- a function return value of type TYPE, and copy that, in virtual format,
- into VALBUF. */
+/* Insert a Hardware breakpoint. */
+static int
+arm_linux_insert_watchpoint (struct target_ops *self,
+ CORE_ADDR addr, int len,
+ enum target_hw_bp_type rw,
+ struct expression *cond)
+{
+ struct lwp_info *lp;
+ struct arm_linux_hw_breakpoint p;
-void
-arm_linux_extract_return_value (struct type *type,
- char regbuf[REGISTER_BYTES],
- char *valbuf)
+ if (arm_linux_get_hw_watchpoint_count () == 0)
+ return -1;
+
+ arm_linux_hw_watchpoint_initialize (addr, len, rw, &p);
+
+ arm_linux_insert_hw_breakpoint1 (&p, 1);
+
+ return 0;
+}
+
+/* Remove a hardware breakpoint. */
+static int
+arm_linux_remove_watchpoint (struct target_ops *self, CORE_ADDR addr,
+ int len, enum target_hw_bp_type rw,
+ struct expression *cond)
{
- /* ScottB: This needs to be looked at to handle the different
- floating point emulators on ARM Linux. Right now the code
- assumes that fetch inferior registers does the right thing for
- GDB. I suspect this won't handle NWFPE registers correctly, nor
- will the default ARM version (arm_extract_return_value()). */
+ struct lwp_info *lp;
+ struct arm_linux_hw_breakpoint p;
- int regnum = (TYPE_CODE_FLT == TYPE_CODE (type)) ? F0_REGNUM : A1_REGNUM;
- memcpy (valbuf, ®buf[REGISTER_BYTE (regnum)], TYPE_LENGTH (type));
+ if (arm_linux_get_hw_watchpoint_count () == 0)
+ return -1;
+
+ arm_linux_hw_watchpoint_initialize (addr, len, rw, &p);
+
+ arm_linux_remove_hw_breakpoint1 (&p, 1);
+
+ return 0;
}
-static unsigned int
-get_linux_version (unsigned int *vmajor,
- unsigned int *vminor,
- unsigned int *vrelease)
+/* What was the data address the target was stopped on accessing. */
+static int
+arm_linux_stopped_data_address (struct target_ops *target, CORE_ADDR *addr_p)
{
- struct utsname info;
- char *pmajor, *pminor, *prelease, *tail;
+ siginfo_t siginfo;
+ int slot;
- if (-1 == uname (&info))
+ if (!linux_nat_get_siginfo (inferior_ptid, &siginfo))
+ return 0;
+
+ /* This must be a hardware breakpoint. */
+ if (siginfo.si_signo != SIGTRAP
+ || (siginfo.si_code & 0xffff) != 0x0004 /* TRAP_HWBKPT */)
+ return 0;
+
+ /* We must be able to set hardware watchpoints. */
+ if (arm_linux_get_hw_watchpoint_count () == 0)
+ return 0;
+
+ slot = siginfo.si_errno;
+
+ /* If we are in a positive slot then we're looking at a breakpoint and not
+ a watchpoint. */
+ if (slot >= 0)
+ return 0;
+
+ *addr_p = (CORE_ADDR) (uintptr_t) siginfo.si_addr;
+ return 1;
+}
+
+/* Has the target been stopped by hitting a watchpoint? */
+static int
+arm_linux_stopped_by_watchpoint (struct target_ops *ops)
+{
+ CORE_ADDR addr;
+ return arm_linux_stopped_data_address (ops, &addr);
+}
+
+static int
+arm_linux_watchpoint_addr_within_range (struct target_ops *target,
+ CORE_ADDR addr,
+ CORE_ADDR start, int length)
+{
+ return start <= addr && start + length - 1 >= addr;
+}
+
+/* Handle thread creation. We need to copy the breakpoints and watchpoints
+ in the parent thread to the child thread. */
+static void
+arm_linux_new_thread (struct lwp_info *lp)
+{
+ int i;
+ struct arch_lwp_info *info = XCNEW (struct arch_lwp_info);
+
+ /* Mark that all the hardware breakpoint/watchpoint register pairs
+ for this thread need to be initialized. */
+
+ for (i = 0; i < MAX_BPTS; i++)
{
- warning ("Unable to determine Linux version.");
- return -1;
+ info->bpts_changed[i] = 1;
+ info->wpts_changed[i] = 1;
}
- pmajor = strtok (info.release, ".");
- pminor = strtok (NULL, ".");
- prelease = strtok (NULL, ".");
+ lp->arch_private = info;
+}
+
+/* Called when resuming a thread.
+ The hardware debug registers are updated when there is any change. */
+
+static void
+arm_linux_prepare_to_resume (struct lwp_info *lwp)
+{
+ int pid, i;
+ struct arm_linux_hw_breakpoint *bpts, *wpts;
+ struct arch_lwp_info *arm_lwp_info = lwp->arch_private;
+
+ pid = ptid_get_lwp (lwp->ptid);
+ bpts = arm_linux_get_debug_reg_state (ptid_get_pid (lwp->ptid))->bpts;
+ wpts = arm_linux_get_debug_reg_state (ptid_get_pid (lwp->ptid))->wpts;
+
+ /* NULL means this is the main thread still going through the shell,
+ or, no watchpoint has been set yet. In that case, there's
+ nothing to do. */
+ if (arm_lwp_info == NULL)
+ return;
+
+ for (i = 0; i < arm_linux_get_hw_breakpoint_count (); i++)
+ if (arm_lwp_info->bpts_changed[i])
+ {
+ errno = 0;
+ if (arm_hwbp_control_is_enabled (bpts[i].control))
+ if (ptrace (PTRACE_SETHBPREGS, pid,
+ (PTRACE_TYPE_ARG3) ((i << 1) + 1), &bpts[i].address) < 0)
+ perror_with_name (_("Unexpected error setting breakpoint"));
+
+ if (bpts[i].control != 0)
+ if (ptrace (PTRACE_SETHBPREGS, pid,
+ (PTRACE_TYPE_ARG3) ((i << 1) + 2), &bpts[i].control) < 0)
+ perror_with_name (_("Unexpected error setting breakpoint"));
+
+ arm_lwp_info->bpts_changed[i] = 0;
+ }
+
+ for (i = 0; i < arm_linux_get_hw_watchpoint_count (); i++)
+ if (arm_lwp_info->wpts_changed[i])
+ {
+ errno = 0;
+ if (arm_hwbp_control_is_enabled (wpts[i].control))
+ if (ptrace (PTRACE_SETHBPREGS, pid,
+ (PTRACE_TYPE_ARG3) -((i << 1) + 1), &wpts[i].address) < 0)
+ perror_with_name (_("Unexpected error setting watchpoint"));
+
+ if (wpts[i].control != 0)
+ if (ptrace (PTRACE_SETHBPREGS, pid,
+ (PTRACE_TYPE_ARG3) -((i << 1) + 2), &wpts[i].control) < 0)
+ perror_with_name (_("Unexpected error setting watchpoint"));
+
+ arm_lwp_info->wpts_changed[i] = 0;
+ }
+}
- *vmajor = (unsigned int) strtoul (pmajor, &tail, 0);
- *vminor = (unsigned int) strtoul (pminor, &tail, 0);
- *vrelease = (unsigned int) strtoul (prelease, &tail, 0);
+/* linux_nat_new_fork hook. */
- return ((*vmajor << 16) | (*vminor << 8) | *vrelease);
+static void
+arm_linux_new_fork (struct lwp_info *parent, pid_t child_pid)
+{
+ pid_t parent_pid;
+ struct arm_linux_debug_reg_state *parent_state;
+ struct arm_linux_debug_reg_state *child_state;
+
+ /* NULL means no watchpoint has ever been set in the parent. In
+ that case, there's nothing to do. */
+ if (parent->arch_private == NULL)
+ return;
+
+ /* 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. */
+
+ parent_pid = ptid_get_pid (parent->ptid);
+ parent_state = arm_linux_get_debug_reg_state (parent_pid);
+ child_state = arm_linux_get_debug_reg_state (child_pid);
+ *child_state = *parent_state;
}
+void _initialize_arm_linux_nat (void);
+
void
_initialize_arm_linux_nat (void)
{
- os_version = get_linux_version (&os_major, &os_minor, &os_release);
+ struct target_ops *t;
+
+ /* Fill in the generic GNU/Linux methods. */
+ t = linux_target ();
+
+ /* Add our register access methods. */
+ t->to_fetch_registers = arm_linux_fetch_inferior_registers;
+ t->to_store_registers = arm_linux_store_inferior_registers;
+
+ /* Add our hardware breakpoint and watchpoint implementation. */
+ t->to_can_use_hw_breakpoint = arm_linux_can_use_hw_breakpoint;
+ t->to_insert_hw_breakpoint = arm_linux_insert_hw_breakpoint;
+ t->to_remove_hw_breakpoint = arm_linux_remove_hw_breakpoint;
+ t->to_region_ok_for_hw_watchpoint = arm_linux_region_ok_for_hw_watchpoint;
+ t->to_insert_watchpoint = arm_linux_insert_watchpoint;
+ t->to_remove_watchpoint = arm_linux_remove_watchpoint;
+ t->to_stopped_by_watchpoint = arm_linux_stopped_by_watchpoint;
+ t->to_stopped_data_address = arm_linux_stopped_data_address;
+ t->to_watchpoint_addr_within_range = arm_linux_watchpoint_addr_within_range;
+
+ t->to_read_description = arm_linux_read_description;
+
+ /* Register the target. */
+ linux_nat_add_target (t);
+
+ /* Handle thread creation and exit. */
+ linux_nat_set_new_thread (t, arm_linux_new_thread);
+ linux_nat_set_prepare_to_resume (t, arm_linux_prepare_to_resume);
+
+ /* Handle process creation and exit. */
+ linux_nat_set_new_fork (t, arm_linux_new_fork);
+ linux_nat_set_forget_process (t, arm_linux_forget_process);
}