/* GNU/Linux on ARM target support.
- Copyright 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+
+ Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+ Free Software Foundation, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
#include "target.h"
#include "doublest.h"
#include "solib-svr4.h"
#include "osabi.h"
+#include "regset.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
#include "arm-tdep.h"
+#include "arm-linux-tdep.h"
+#include "glibc-tdep.h"
+
+#include "gdb_string.h"
-/* For shared library handling. */
-#include "symtab.h"
-#include "symfile.h"
-#include "objfiles.h"
+extern int arm_apcs_32;
/* Under ARM GNU/Linux the traditional way of performing a breakpoint
is to execute a particular software interrupt, rather than use a
particular undefined instruction to provoke a trap. Upon exection
of the software interrupt the kernel stops the inferior with a
- SIGTRAP, and wakes the debugger. Since ARM GNU/Linux doesn't support
- Thumb at the moment we only override the ARM breakpoints. */
+ SIGTRAP, and wakes the debugger. */
static const char arm_linux_arm_le_breakpoint[] = { 0x01, 0x00, 0x9f, 0xef };
static const char arm_linux_arm_be_breakpoint[] = { 0xef, 0x9f, 0x00, 0x01 };
-/* DEPRECATED_CALL_DUMMY_WORDS:
- This sequence of words is the instructions
+/* However, the EABI syscall interface (new in Nov. 2005) does not look at
+ the operand of the swi if old-ABI compatibility is disabled. Therefore,
+ use an undefined instruction instead. This is supported as of kernel
+ version 2.5.70 (May 2003), so should be a safe assumption for EABI
+ binaries. */
- mov lr, pc
- mov pc, r4
- swi bkpt_swi
+static const char eabi_linux_arm_le_breakpoint[] = { 0xf0, 0x01, 0xf0, 0xe7 };
- Note this is 12 bytes. */
+static const char eabi_linux_arm_be_breakpoint[] = { 0xe7, 0xf0, 0x01, 0xf0 };
-LONGEST arm_linux_call_dummy_words[] =
-{
- 0xe1a0e00f, 0xe1a0f004, 0xef9f001
-};
+/* All the kernels which support Thumb support using a specific undefined
+ instruction for the Thumb breakpoint. */
+
+static const char arm_linux_thumb_be_breakpoint[] = {0xde, 0x01};
+
+static const char arm_linux_thumb_le_breakpoint[] = {0x01, 0xde};
/* Description of the longjmp buffer. */
-#define ARM_LINUX_JB_ELEMENT_SIZE INT_REGISTER_RAW_SIZE
+#define ARM_LINUX_JB_ELEMENT_SIZE INT_REGISTER_SIZE
#define ARM_LINUX_JB_PC 21
/* Extract from an array REGBUF containing the (raw) register state
hidden behind the regcache abstraction. */
static void
arm_linux_extract_return_value (struct type *type,
- char regbuf[],
- char *valbuf)
+ gdb_byte regbuf[],
+ gdb_byte *valbuf)
{
/* ScottB: This needs to be looked at to handle the different
floating point emulators on ARM GNU/Linux. Right now the code
int regnum = ((TYPE_CODE_FLT == TYPE_CODE (type))
? ARM_F0_REGNUM : ARM_A1_REGNUM);
- memcpy (valbuf, ®buf[REGISTER_BYTE (regnum)], TYPE_LENGTH (type));
+ memcpy (valbuf, ®buf[DEPRECATED_REGISTER_BYTE (regnum)], TYPE_LENGTH (type));
}
-
-/* Note: ScottB
-
- This function does not support passing parameters using the FPA
- variant of the APCS. It passes any floating point arguments in the
- general registers and/or on the stack.
-
- FIXME: This and arm_push_arguments should be merged. However this
- function breaks on a little endian host, big endian target
- using the COFF file format. ELF is ok.
-
- ScottB. */
-
-/* Addresses for calling Thumb functions have the bit 0 set.
- Here are some macros to test, set, or clear bit 0 of addresses. */
-#define IS_THUMB_ADDR(addr) ((addr) & 1)
-#define MAKE_THUMB_ADDR(addr) ((addr) | 1)
-#define UNMAKE_THUMB_ADDR(addr) ((addr) & ~1)
-static CORE_ADDR
-arm_linux_push_arguments (int nargs, struct value **args, CORE_ADDR sp,
- int struct_return, CORE_ADDR struct_addr)
-{
- char *fp;
- int argnum, argreg, nstack_size;
-
- /* Walk through the list of args and determine how large a temporary
- stack is required. Need to take care here as structs may be
- passed on the stack, and we have to to push them. */
- nstack_size = -4 * DEPRECATED_REGISTER_SIZE; /* Some arguments go into A1-A4. */
-
- if (struct_return) /* The struct address goes in A1. */
- nstack_size += DEPRECATED_REGISTER_SIZE;
-
- /* Walk through the arguments and add their size to nstack_size. */
- for (argnum = 0; argnum < nargs; argnum++)
- {
- int len;
- struct type *arg_type;
-
- arg_type = check_typedef (VALUE_TYPE (args[argnum]));
- len = TYPE_LENGTH (arg_type);
-
- /* ANSI C code passes float arguments as integers, K&R code
- passes float arguments as doubles. Correct for this here. */
- if (TYPE_CODE_FLT == TYPE_CODE (arg_type) && DEPRECATED_REGISTER_SIZE == len)
- nstack_size += FP_REGISTER_VIRTUAL_SIZE;
- else
- nstack_size += len;
- }
-
- /* Allocate room on the stack, and initialize our stack frame
- pointer. */
- fp = NULL;
- if (nstack_size > 0)
- {
- sp -= nstack_size;
- fp = (char *) sp;
- }
-
- /* Initialize the integer argument register pointer. */
- argreg = ARM_A1_REGNUM;
-
- /* The struct_return pointer occupies the first parameter passing
- register. */
- if (struct_return)
- write_register (argreg++, struct_addr);
-
- /* Process arguments from left to right. Store as many as allowed
- in the parameter passing registers (A1-A4), and save the rest on
- the temporary stack. */
- for (argnum = 0; argnum < nargs; argnum++)
- {
- int len;
- char *val;
- CORE_ADDR regval;
- enum type_code typecode;
- struct type *arg_type, *target_type;
-
- arg_type = check_typedef (VALUE_TYPE (args[argnum]));
- target_type = TYPE_TARGET_TYPE (arg_type);
- len = TYPE_LENGTH (arg_type);
- typecode = TYPE_CODE (arg_type);
- val = (char *) VALUE_CONTENTS (args[argnum]);
-
- /* ANSI C code passes float arguments as integers, K&R code
- passes float arguments as doubles. The .stabs record for
- for ANSI prototype floating point arguments records the
- type as FP_INTEGER, while a K&R style (no prototype)
- .stabs records the type as FP_FLOAT. In this latter case
- the compiler converts the float arguments to double before
- calling the function. */
- if (TYPE_CODE_FLT == typecode && DEPRECATED_REGISTER_SIZE == len)
- {
- DOUBLEST dblval;
- dblval = deprecated_extract_floating (val, len);
- len = TARGET_DOUBLE_BIT / TARGET_CHAR_BIT;
- val = alloca (len);
- deprecated_store_floating (val, len, dblval);
- }
-
- /* If the argument is a pointer to a function, and it is a Thumb
- function, set the low bit of the pointer. */
- if (TYPE_CODE_PTR == typecode
- && NULL != target_type
- && TYPE_CODE_FUNC == TYPE_CODE (target_type))
- {
- CORE_ADDR regval = extract_unsigned_integer (val, len);
- if (arm_pc_is_thumb (regval))
- store_unsigned_integer (val, len, MAKE_THUMB_ADDR (regval));
- }
-
- /* Copy the argument to general registers or the stack in
- register-sized pieces. Large arguments are split between
- registers and stack. */
- while (len > 0)
- {
- int partial_len = len < DEPRECATED_REGISTER_SIZE ? len : DEPRECATED_REGISTER_SIZE;
-
- if (argreg <= ARM_LAST_ARG_REGNUM)
- {
- /* It's an argument being passed in a general register. */
- regval = extract_unsigned_integer (val, partial_len);
- write_register (argreg++, regval);
- }
- else
- {
- /* Push the arguments onto the stack. */
- write_memory ((CORE_ADDR) fp, val, DEPRECATED_REGISTER_SIZE);
- fp += DEPRECATED_REGISTER_SIZE;
- }
-
- len -= partial_len;
- val += partial_len;
- }
- }
-
- /* Return adjusted stack pointer. */
- return sp;
-}
-
/*
Dynamic Linking on ARM GNU/Linux
--------------------------------
with. Before the fixup/resolver code returns, it actually calls
the requested function and repairs &GOT[n+3]. */
-/* Find the minimal symbol named NAME, and return both the minsym
- struct and its objfile. This probably ought to be in minsym.c, but
- everything there is trying to deal with things like C++ and
- SOFUN_ADDRESS_MAYBE_TURQUOISE, ... Since this is so simple, it may
- be considered too special-purpose for general consumption. */
+/* The constants below were determined by examining the following files
+ in the linux kernel sources:
-static struct minimal_symbol *
-find_minsym_and_objfile (char *name, struct objfile **objfile_p)
+ arch/arm/kernel/signal.c
+ - see SWI_SYS_SIGRETURN and SWI_SYS_RT_SIGRETURN
+ include/asm-arm/unistd.h
+ - see __NR_sigreturn, __NR_rt_sigreturn, and __NR_SYSCALL_BASE */
+
+#define ARM_LINUX_SIGRETURN_INSTR 0xef900077
+#define ARM_LINUX_RT_SIGRETURN_INSTR 0xef9000ad
+
+/* For ARM EABI, the syscall number is not in the SWI instruction
+ (instead it is loaded into r7). We recognize the pattern that
+ glibc uses... alternatively, we could arrange to do this by
+ function name, but they are not always exported. */
+#define ARM_SET_R7_SIGRETURN 0xe3a07077
+#define ARM_SET_R7_RT_SIGRETURN 0xe3a070ad
+#define ARM_EABI_SYSCALL 0xef000000
+
+static void
+arm_linux_sigtramp_cache (struct frame_info *next_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func, int regs_offset)
{
- struct objfile *objfile;
+ CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, ARM_SP_REGNUM);
+ CORE_ADDR base = sp + regs_offset;
+ int i;
- ALL_OBJFILES (objfile)
- {
- struct minimal_symbol *msym;
-
- ALL_OBJFILE_MSYMBOLS (objfile, msym)
- {
- if (DEPRECATED_SYMBOL_NAME (msym)
- && strcmp (DEPRECATED_SYMBOL_NAME (msym), name) == 0)
- {
- *objfile_p = objfile;
- return msym;
- }
- }
- }
+ for (i = 0; i < 16; i++)
+ trad_frame_set_reg_addr (this_cache, i, base + i * 4);
+
+ trad_frame_set_reg_addr (this_cache, ARM_PS_REGNUM, base + 16 * 4);
+
+ /* The VFP or iWMMXt registers may be saved on the stack, but there's
+ no reliable way to restore them (yet). */
- return 0;
+ /* Save a frame ID. */
+ trad_frame_set_id (this_cache, frame_id_build (sp, func));
}
+/* There are a couple of different possible stack layouts that
+ we need to support.
-/* Fetch, and possibly build, an appropriate link_map_offsets structure
- for ARM linux targets using the struct offsets defined in <link.h>.
- Note, however, that link.h is not actually referred to in this file.
- Instead, the relevant structs offsets were obtained from examining
- link.h. (We can't refer to link.h from this file because the host
- system won't necessarily have it, or if it does, the structs which
- it defines will refer to the host system, not the target). */
+ Before version 2.6.18, the kernel used completely independent
+ layouts for non-RT and RT signals. For non-RT signals the stack
+ began directly with a struct sigcontext. For RT signals the stack
+ began with two redundant pointers (to the siginfo and ucontext),
+ and then the siginfo and ucontext.
-static struct link_map_offsets *
-arm_linux_svr4_fetch_link_map_offsets (void)
+ As of version 2.6.18, the non-RT signal frame layout starts with
+ a ucontext and the RT signal frame starts with a siginfo and then
+ a ucontext. Also, the ucontext now has a designated save area
+ for coprocessor registers.
+
+ For RT signals, it's easy to tell the difference: we look for
+ pinfo, the pointer to the siginfo. If it has the expected
+ value, we have an old layout. If it doesn't, we have the new
+ layout.
+
+ For non-RT signals, it's a bit harder. We need something in one
+ layout or the other with a recognizable offset and value. We can't
+ use the return trampoline, because ARM usually uses SA_RESTORER,
+ in which case the stack return trampoline is not filled in.
+ We can't use the saved stack pointer, because sigaltstack might
+ be in use. So for now we guess the new layout... */
+
+/* There are three words (trap_no, error_code, oldmask) in
+ struct sigcontext before r0. */
+#define ARM_SIGCONTEXT_R0 0xc
+
+/* There are five words (uc_flags, uc_link, and three for uc_stack)
+ in the ucontext_t before the sigcontext. */
+#define ARM_UCONTEXT_SIGCONTEXT 0x14
+
+/* There are three elements in an rt_sigframe before the ucontext:
+ pinfo, puc, and info. The first two are pointers and the third
+ is a struct siginfo, with size 128 bytes. We could follow puc
+ to the ucontext, but it's simpler to skip the whole thing. */
+#define ARM_OLD_RT_SIGFRAME_SIGINFO 0x8
+#define ARM_OLD_RT_SIGFRAME_UCONTEXT 0x88
+
+#define ARM_NEW_RT_SIGFRAME_UCONTEXT 0x80
+
+#define ARM_NEW_SIGFRAME_MAGIC 0x5ac3c35a
+
+static void
+arm_linux_sigreturn_init (const struct tramp_frame *self,
+ struct frame_info *next_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
{
- static struct link_map_offsets lmo;
- static struct link_map_offsets *lmp = 0;
+ CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, ARM_SP_REGNUM);
+ ULONGEST uc_flags = read_memory_unsigned_integer (sp, 4);
- if (lmp == 0)
- {
- lmp = &lmo;
+ if (uc_flags == ARM_NEW_SIGFRAME_MAGIC)
+ arm_linux_sigtramp_cache (next_frame, this_cache, func,
+ ARM_UCONTEXT_SIGCONTEXT
+ + ARM_SIGCONTEXT_R0);
+ else
+ arm_linux_sigtramp_cache (next_frame, this_cache, func,
+ ARM_SIGCONTEXT_R0);
+}
- lmo.r_debug_size = 8; /* Actual size is 20, but this is all we
- need. */
+static void
+arm_linux_rt_sigreturn_init (const struct tramp_frame *self,
+ struct frame_info *next_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
+{
+ CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, ARM_SP_REGNUM);
+ ULONGEST pinfo = read_memory_unsigned_integer (sp, 4);
+
+ if (pinfo == sp + ARM_OLD_RT_SIGFRAME_SIGINFO)
+ arm_linux_sigtramp_cache (next_frame, this_cache, func,
+ ARM_OLD_RT_SIGFRAME_UCONTEXT
+ + ARM_UCONTEXT_SIGCONTEXT
+ + ARM_SIGCONTEXT_R0);
+ else
+ arm_linux_sigtramp_cache (next_frame, this_cache, func,
+ ARM_NEW_RT_SIGFRAME_UCONTEXT
+ + ARM_UCONTEXT_SIGCONTEXT
+ + ARM_SIGCONTEXT_R0);
+}
+
+static struct tramp_frame arm_linux_sigreturn_tramp_frame = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { ARM_LINUX_SIGRETURN_INSTR, -1 },
+ { TRAMP_SENTINEL_INSN }
+ },
+ arm_linux_sigreturn_init
+};
+
+static struct tramp_frame arm_linux_rt_sigreturn_tramp_frame = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { ARM_LINUX_RT_SIGRETURN_INSTR, -1 },
+ { TRAMP_SENTINEL_INSN }
+ },
+ arm_linux_rt_sigreturn_init
+};
+
+static struct tramp_frame arm_eabi_linux_sigreturn_tramp_frame = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { ARM_SET_R7_SIGRETURN, -1 },
+ { ARM_EABI_SYSCALL, -1 },
+ { TRAMP_SENTINEL_INSN }
+ },
+ arm_linux_sigreturn_init
+};
- lmo.r_map_offset = 4;
- lmo.r_map_size = 4;
+static struct tramp_frame arm_eabi_linux_rt_sigreturn_tramp_frame = {
+ SIGTRAMP_FRAME,
+ 4,
+ {
+ { ARM_SET_R7_RT_SIGRETURN, -1 },
+ { ARM_EABI_SYSCALL, -1 },
+ { TRAMP_SENTINEL_INSN }
+ },
+ arm_linux_rt_sigreturn_init
+};
- lmo.link_map_size = 20; /* Actual size is 552, but this is all we
- need. */
+/* Core file and register set support. */
- lmo.l_addr_offset = 0;
- lmo.l_addr_size = 4;
+#define ARM_LINUX_SIZEOF_GREGSET (18 * INT_REGISTER_SIZE)
- lmo.l_name_offset = 4;
- lmo.l_name_size = 4;
+void
+arm_linux_supply_gregset (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *gregs_buf, size_t len)
+{
+ const gdb_byte *gregs = gregs_buf;
+ int regno;
+ CORE_ADDR reg_pc;
+ gdb_byte pc_buf[INT_REGISTER_SIZE];
- lmo.l_next_offset = 12;
- lmo.l_next_size = 4;
+ for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
+ if (regnum == -1 || regnum == regno)
+ regcache_raw_supply (regcache, regno,
+ gregs + INT_REGISTER_SIZE * regno);
- lmo.l_prev_offset = 16;
- lmo.l_prev_size = 4;
+ if (regnum == ARM_PS_REGNUM || regnum == -1)
+ {
+ if (arm_apcs_32)
+ regcache_raw_supply (regcache, ARM_PS_REGNUM,
+ gregs + INT_REGISTER_SIZE * ARM_CPSR_REGNUM);
+ else
+ regcache_raw_supply (regcache, ARM_PS_REGNUM,
+ gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM);
}
- return lmp;
+ if (regnum == ARM_PC_REGNUM || regnum == -1)
+ {
+ reg_pc = extract_unsigned_integer (gregs
+ + INT_REGISTER_SIZE * ARM_PC_REGNUM,
+ INT_REGISTER_SIZE);
+ reg_pc = ADDR_BITS_REMOVE (reg_pc);
+ store_unsigned_integer (pc_buf, INT_REGISTER_SIZE, reg_pc);
+ regcache_raw_supply (regcache, ARM_PC_REGNUM, pc_buf);
+ }
}
-static CORE_ADDR
-skip_hurd_resolver (CORE_ADDR pc)
+void
+arm_linux_collect_gregset (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *gregs_buf, size_t len)
{
- /* The HURD dynamic linker is part of the GNU C library, so many
- GNU/Linux distributions use it. (All ELF versions, as far as I
- know.) An unresolved PLT entry points to "_dl_runtime_resolve",
- which calls "fixup" to patch the PLT, and then passes control to
- the function.
-
- We look for the symbol `_dl_runtime_resolve', and find `fixup' in
- the same objfile. If we are at the entry point of `fixup', then
- we set a breakpoint at the return address (at the top of the
- stack), and continue.
-
- It's kind of gross to do all these checks every time we're
- called, since they don't change once the executable has gotten
- started. But this is only a temporary hack --- upcoming versions
- of GNU/Linux will provide a portable, efficient interface for
- debugging programs that use shared libraries. */
-
- struct objfile *objfile;
- struct minimal_symbol *resolver
- = find_minsym_and_objfile ("_dl_runtime_resolve", &objfile);
-
- if (resolver)
- {
- struct minimal_symbol *fixup
- = lookup_minimal_symbol ("fixup", NULL, objfile);
+ gdb_byte *gregs = gregs_buf;
+ int regno;
+
+ for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
+ if (regnum == -1 || regnum == regno)
+ regcache_raw_collect (regcache, regno,
+ gregs + INT_REGISTER_SIZE * regno);
- if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc)
- return (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ()));
+ if (regnum == ARM_PS_REGNUM || regnum == -1)
+ {
+ if (arm_apcs_32)
+ regcache_raw_collect (regcache, ARM_PS_REGNUM,
+ gregs + INT_REGISTER_SIZE * ARM_CPSR_REGNUM);
+ else
+ regcache_raw_collect (regcache, ARM_PS_REGNUM,
+ gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM);
}
- return 0;
-}
+ if (regnum == ARM_PC_REGNUM || regnum == -1)
+ regcache_raw_collect (regcache, ARM_PC_REGNUM,
+ gregs + INT_REGISTER_SIZE * ARM_PC_REGNUM);
+}
+
+/* Support for register format used by the NWFPE FPA emulator. */
-/* See the comments for SKIP_SOLIB_RESOLVER at the top of infrun.c.
- This function:
- 1) decides whether a PLT has sent us into the linker to resolve
- a function reference, and
- 2) if so, tells us where to set a temporary breakpoint that will
- trigger when the dynamic linker is done. */
+#define typeNone 0x00
+#define typeSingle 0x01
+#define typeDouble 0x02
+#define typeExtended 0x03
-CORE_ADDR
-arm_linux_skip_solib_resolver (CORE_ADDR pc)
+void
+supply_nwfpe_register (struct regcache *regcache, int regno,
+ const gdb_byte *regs)
{
- CORE_ADDR result;
+ const gdb_byte *reg_data;
+ gdb_byte reg_tag;
+ gdb_byte buf[FP_REGISTER_SIZE];
- /* Plug in functions for other kinds of resolvers here. */
- result = skip_hurd_resolver (pc);
+ reg_data = regs + (regno - ARM_F0_REGNUM) * FP_REGISTER_SIZE;
+ reg_tag = regs[(regno - ARM_F0_REGNUM) + NWFPE_TAGS_OFFSET];
+ memset (buf, 0, FP_REGISTER_SIZE);
- if (result)
- return result;
-
- return 0;
+ switch (reg_tag)
+ {
+ case typeSingle:
+ memcpy (buf, reg_data, 4);
+ break;
+ case typeDouble:
+ memcpy (buf, reg_data + 4, 4);
+ memcpy (buf + 4, reg_data, 4);
+ break;
+ case typeExtended:
+ /* We want sign and exponent, then least significant bits,
+ then most significant. NWFPE does sign, most, least. */
+ memcpy (buf, reg_data, 4);
+ memcpy (buf + 4, reg_data + 8, 4);
+ memcpy (buf + 8, reg_data + 4, 4);
+ break;
+ default:
+ break;
+ }
+
+ regcache_raw_supply (regcache, regno, buf);
}
-/* The constants below were determined by examining the following files
- in the linux kernel sources:
+void
+collect_nwfpe_register (const struct regcache *regcache, int regno,
+ gdb_byte *regs)
+{
+ gdb_byte *reg_data;
+ gdb_byte reg_tag;
+ gdb_byte buf[FP_REGISTER_SIZE];
- arch/arm/kernel/signal.c
- - see SWI_SYS_SIGRETURN and SWI_SYS_RT_SIGRETURN
- include/asm-arm/unistd.h
- - see __NR_sigreturn, __NR_rt_sigreturn, and __NR_SYSCALL_BASE */
+ regcache_raw_collect (regcache, regno, buf);
-#define ARM_LINUX_SIGRETURN_INSTR 0xef900077
-#define ARM_LINUX_RT_SIGRETURN_INSTR 0xef9000ad
+ /* NOTE drow/2006-06-07: This code uses the tag already in the
+ register buffer. I've preserved that when moving the code
+ from the native file to the target file. But this doesn't
+ always make sense. */
-/* arm_linux_in_sigtramp determines if PC points at one of the
- instructions which cause control to return to the Linux kernel upon
- return from a signal handler. FUNC_NAME is unused. */
+ reg_data = regs + (regno - ARM_F0_REGNUM) * FP_REGISTER_SIZE;
+ reg_tag = regs[(regno - ARM_F0_REGNUM) + NWFPE_TAGS_OFFSET];
-int
-arm_linux_in_sigtramp (CORE_ADDR pc, char *func_name)
+ switch (reg_tag)
+ {
+ case typeSingle:
+ memcpy (reg_data, buf, 4);
+ break;
+ case typeDouble:
+ memcpy (reg_data, buf + 4, 4);
+ memcpy (reg_data + 4, buf, 4);
+ break;
+ case typeExtended:
+ memcpy (reg_data, buf, 4);
+ memcpy (reg_data + 4, buf + 8, 4);
+ memcpy (reg_data + 8, buf + 4, 4);
+ break;
+ default:
+ break;
+ }
+}
+
+void
+arm_linux_supply_nwfpe (const struct regset *regset,
+ struct regcache *regcache,
+ int regnum, const void *regs_buf, size_t len)
{
- unsigned long inst;
+ const gdb_byte *regs = regs_buf;
+ int regno;
+
+ if (regnum == ARM_FPS_REGNUM || regnum == -1)
+ regcache_raw_supply (regcache, ARM_FPS_REGNUM,
+ regs + NWFPE_FPSR_OFFSET);
- inst = read_memory_integer (pc, 4);
+ for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
+ if (regnum == -1 || regnum == regno)
+ supply_nwfpe_register (regcache, regno, regs);
+}
+
+void
+arm_linux_collect_nwfpe (const struct regset *regset,
+ const struct regcache *regcache,
+ int regnum, void *regs_buf, size_t len)
+{
+ gdb_byte *regs = regs_buf;
+ int regno;
- return (inst == ARM_LINUX_SIGRETURN_INSTR
- || inst == ARM_LINUX_RT_SIGRETURN_INSTR);
+ for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
+ if (regnum == -1 || regnum == regno)
+ collect_nwfpe_register (regcache, regno, regs);
+ if (regnum == ARM_FPS_REGNUM || regnum == -1)
+ regcache_raw_collect (regcache, ARM_FPS_REGNUM,
+ regs + INT_REGISTER_SIZE * ARM_FPS_REGNUM);
}
-/* arm_linux_sigcontext_register_address returns the address in the
- sigcontext of register REGNO given a stack pointer value SP and
- program counter value PC. The value 0 is returned if PC is not
- pointing at one of the signal return instructions or if REGNO is
- not saved in the sigcontext struct. */
+/* Return the appropriate register set for the core section identified
+ by SECT_NAME and SECT_SIZE. */
-CORE_ADDR
-arm_linux_sigcontext_register_address (CORE_ADDR sp, CORE_ADDR pc, int regno)
+static const struct regset *
+arm_linux_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name, size_t sect_size)
{
- unsigned long inst;
- CORE_ADDR reg_addr = 0;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- inst = read_memory_integer (pc, 4);
+ if (strcmp (sect_name, ".reg") == 0
+ && sect_size == ARM_LINUX_SIZEOF_GREGSET)
+ {
+ if (tdep->gregset == NULL)
+ tdep->gregset = regset_alloc (gdbarch, arm_linux_supply_gregset,
+ arm_linux_collect_gregset);
+ return tdep->gregset;
+ }
- if (inst == ARM_LINUX_SIGRETURN_INSTR
- || inst == ARM_LINUX_RT_SIGRETURN_INSTR)
+ if (strcmp (sect_name, ".reg2") == 0
+ && sect_size == ARM_LINUX_SIZEOF_NWFPE)
{
- CORE_ADDR sigcontext_addr;
-
- /* The sigcontext structure is at different places for the two
- signal return instructions. For ARM_LINUX_SIGRETURN_INSTR,
- it starts at the SP value. For ARM_LINUX_RT_SIGRETURN_INSTR,
- it is at SP+8. For the latter instruction, it may also be
- the case that the address of this structure may be determined
- by reading the 4 bytes at SP, but I'm not convinced this is
- reliable.
-
- In any event, these magic constants (0 and 8) may be
- determined by examining struct sigframe and struct
- rt_sigframe in arch/arm/kernel/signal.c in the Linux kernel
- sources. */
-
- if (inst == ARM_LINUX_RT_SIGRETURN_INSTR)
- sigcontext_addr = sp + 8;
- else /* inst == ARM_LINUX_SIGRETURN_INSTR */
- sigcontext_addr = sp + 0;
-
- /* The layout of the sigcontext structure for ARM GNU/Linux is
- in include/asm-arm/sigcontext.h in the Linux kernel sources.
-
- There are three 4-byte fields which precede the saved r0
- field. (This accounts for the 12 in the code below.) The
- sixteen registers (4 bytes per field) follow in order. The
- PSR value follows the sixteen registers which accounts for
- the constant 19 below. */
-
- if (0 <= regno && regno <= ARM_PC_REGNUM)
- reg_addr = sigcontext_addr + 12 + (4 * regno);
- else if (regno == ARM_PS_REGNUM)
- reg_addr = sigcontext_addr + 19 * 4;
+ if (tdep->fpregset == NULL)
+ tdep->fpregset = regset_alloc (gdbarch, arm_linux_supply_nwfpe,
+ arm_linux_collect_nwfpe);
+ return tdep->fpregset;
}
- return reg_addr;
+ return NULL;
}
static void
tdep->lowest_pc = 0x8000;
if (info.byte_order == BFD_ENDIAN_BIG)
- tdep->arm_breakpoint = arm_linux_arm_be_breakpoint;
+ {
+ if (tdep->arm_abi == ARM_ABI_AAPCS)
+ tdep->arm_breakpoint = eabi_linux_arm_be_breakpoint;
+ else
+ tdep->arm_breakpoint = arm_linux_arm_be_breakpoint;
+ tdep->thumb_breakpoint = arm_linux_thumb_be_breakpoint;
+ }
else
- tdep->arm_breakpoint = arm_linux_arm_le_breakpoint;
+ {
+ if (tdep->arm_abi == ARM_ABI_AAPCS)
+ tdep->arm_breakpoint = eabi_linux_arm_le_breakpoint;
+ else
+ tdep->arm_breakpoint = arm_linux_arm_le_breakpoint;
+ tdep->thumb_breakpoint = arm_linux_thumb_le_breakpoint;
+ }
tdep->arm_breakpoint_size = sizeof (arm_linux_arm_le_breakpoint);
+ tdep->thumb_breakpoint_size = sizeof (arm_linux_thumb_le_breakpoint);
- tdep->fp_model = ARM_FLOAT_FPA;
+ if (tdep->fp_model == ARM_FLOAT_AUTO)
+ tdep->fp_model = ARM_FLOAT_FPA;
tdep->jb_pc = ARM_LINUX_JB_PC;
tdep->jb_elt_size = ARM_LINUX_JB_ELEMENT_SIZE;
set_solib_svr4_fetch_link_map_offsets
- (gdbarch, arm_linux_svr4_fetch_link_map_offsets);
-
- set_gdbarch_deprecated_call_dummy_words (gdbarch, arm_linux_call_dummy_words);
- set_gdbarch_deprecated_sizeof_call_dummy_words (gdbarch, sizeof (arm_linux_call_dummy_words));
+ (gdbarch, svr4_ilp32_fetch_link_map_offsets);
- /* The following two overrides shouldn't be needed. */
+ /* The following override shouldn't be needed. */
set_gdbarch_deprecated_extract_return_value (gdbarch, arm_linux_extract_return_value);
- set_gdbarch_deprecated_push_arguments (gdbarch, arm_linux_push_arguments);
/* Shared library handling. */
- set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+ set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
+
+ /* Enable TLS support. */
+ set_gdbarch_fetch_tls_load_module_address (gdbarch,
+ svr4_fetch_objfile_link_map);
+
+ tramp_frame_prepend_unwinder (gdbarch,
+ &arm_linux_sigreturn_tramp_frame);
+ tramp_frame_prepend_unwinder (gdbarch,
+ &arm_linux_rt_sigreturn_tramp_frame);
+ tramp_frame_prepend_unwinder (gdbarch,
+ &arm_eabi_linux_sigreturn_tramp_frame);
+ tramp_frame_prepend_unwinder (gdbarch,
+ &arm_eabi_linux_rt_sigreturn_tramp_frame);
+
+ /* Core file support. */
+ set_gdbarch_regset_from_core_section (gdbarch,
+ arm_linux_regset_from_core_section);
}
void
projects / deliverable / binutils-gdb.git / blobdiff