/* Definitions to target GDB to GNU/Linux on 386.
- Copyright 1992, 1993 Free Software Foundation, Inc.
+ Copyright 1992, 1993, 1995, 1996, 1998, 1999, 2000, 2001
+ Free Software Foundation, Inc.
This file is part of GDB.
#define I386_GNULINUX_TARGET
#define HAVE_I387_REGS
-#ifdef HAVE_PTRACE_GETXFPREGS
+#ifdef HAVE_PTRACE_GETFPXREGS
#define HAVE_SSE_REGS
#endif
#include "i386/tm-i386.h"
#include "tm-linux.h"
-#define LOW_RETURN_REGNUM 0 /* holds low four bytes of result */
-#define HIGH_RETURN_REGNUM 2 /* holds high four bytes of result */
-
-/* This should probably move to tm-i386.h. */
-#define TARGET_LONG_DOUBLE_BIT 80
-
-#if defined(HAVE_LONG_DOUBLE) && defined(HOST_I386)
-/* The host and target are i386 machines and the compiler supports
- long doubles. Long doubles on the host therefore have the same
- layout as a 387 FPU stack register. */
-#define LD_I387
-
-extern int i387_extract_floating (PTR addr, int len, long double *dretptr);
-extern int i387_store_floating (PTR addr, int len, long double val);
-
-#define TARGET_EXTRACT_FLOATING i387_extract_floating
-#define TARGET_STORE_FLOATING i387_store_floating
-
-#define TARGET_ANALYZE_FLOATING \
- do \
- { \
- unsigned expon; \
- \
- low = extract_unsigned_integer (valaddr, 4); \
- high = extract_unsigned_integer (valaddr + 4, 4); \
- expon = extract_unsigned_integer (valaddr + 8, 2); \
- \
- nonnegative = ((expon & 0x8000) == 0); \
- is_nan = ((expon & 0x7fff) == 0x7fff) \
- && ((high & 0x80000000) == 0x80000000) \
- && (((high & 0x7fffffff) | low) != 0); \
- } \
- while (0)
-
-#undef REGISTER_CONVERT_TO_VIRTUAL
-#define REGISTER_CONVERT_TO_VIRTUAL(REGNUM,TYPE,FROM,TO) \
-{ \
- long double val = *((long double *)FROM); \
- store_floating ((TO), TYPE_LENGTH (TYPE), val); \
-}
-
-#undef REGISTER_CONVERT_TO_RAW
-#define REGISTER_CONVERT_TO_RAW(TYPE,REGNUM,FROM,TO) \
-{ \
- long double val = extract_floating ((FROM), TYPE_LENGTH (TYPE)); \
- *((long double *)TO) = val; \
-}
-
-/* Return the GDB type object for the "standard" data type
- of data in register N. */
-#undef REGISTER_VIRTUAL_TYPE
-#define REGISTER_VIRTUAL_TYPE(N) \
- (((N) == PC_REGNUM || (N) == FP_REGNUM || (N) == SP_REGNUM) \
- ? lookup_pointer_type (builtin_type_void) \
- : IS_FP_REGNUM(N) ? builtin_type_long_double \
- : IS_SSE_REGNUM(N) ? builtin_type_v4sf \
- : builtin_type_int)
+/* Register number for the "orig_eax" pseudo-register. If this
+ pseudo-register contains a value >= 0 it is interpreted as the
+ system call number that the kernel is supposed to restart. */
+#define I386_LINUX_ORIG_EAX_REGNUM 41
-#endif
+/* Adjust a few macros to deal with this extra register. */
+
+#undef NUM_REGS
+#define NUM_REGS (NUM_GREGS + NUM_FREGS + NUM_SSE_REGS + 1)
+
+#undef MAX_NUM_REGS
+#define MAX_NUM_REGS (16 + 16 + 9 + 1)
+
+#undef REGISTER_BYTES
+#define REGISTER_BYTES \
+ (SIZEOF_GREGS + SIZEOF_FPU_REGS + SIZEOF_FPU_CTRL_REGS + SIZEOF_SSE_REGS + 4)
+
+#undef REGISTER_NAME
+#define REGISTER_NAME(reg) i386_linux_register_name ((reg))
+extern char *i386_linux_register_name (int reg);
+
+#undef REGISTER_BYTE
+#define REGISTER_BYTE(reg) i386_linux_register_byte ((reg))
+extern int i386_linux_register_byte (int reg);
+
+#undef REGISTER_RAW_SIZE
+#define REGISTER_RAW_SIZE(reg) i386_linux_register_raw_size ((reg))
+extern int i386_linux_register_raw_size (int reg);
+
+/* Linux/ELF uses stabs-in-ELF with the DWARF register numbering
+ scheme by default, so we must redefine STAB_REG_TO_REGNUM. This
+ messes up the floating-point registers for a.out, but there is not
+ much we can do about that. */
+#undef STAB_REG_TO_REGNUM
+#define STAB_REG_TO_REGNUM(reg) i386_dwarf_reg_to_regnum ((reg))
+
+/* Use target_specific function to define link map offsets. */
+extern struct link_map_offsets *i386_linux_svr4_fetch_link_map_offsets (void);
+#define SVR4_FETCH_LINK_MAP_OFFSETS() i386_linux_svr4_fetch_link_map_offsets ()
/* The following works around a problem with /usr/include/sys/procfs.h */
#define sys_quotactl 1
are used to identify this bit of code as a signal trampoline in
order to support backtracing through calls to signal handlers. */
-#define I386_LINUX_SIGTRAMP
#define IN_SIGTRAMP(pc, name) i386_linux_in_sigtramp (pc, name)
extern int i386_linux_in_sigtramp (CORE_ADDR, char *);
-/* We need our own version of sigtramp_saved_pc to get the saved PC in
- a sigtramp routine. */
-
-#define sigtramp_saved_pc i386_linux_sigtramp_saved_pc
-extern CORE_ADDR i386_linux_sigtramp_saved_pc (struct frame_info *);
-
-/* Signal trampolines don't have a meaningful frame. As in tm-i386.h,
- the frame pointer value we use is actually the frame pointer of the
- calling frame--that is, the frame which was in progress when the
- signal trampoline was entered. gdb mostly treats this frame
- pointer value as a magic cookie. We detect the case of a signal
- trampoline by looking at the SIGNAL_HANDLER_CALLER field, which is
- set based on IN_SIGTRAMP.
-
- When a signal trampoline is invoked from a frameless function, we
- essentially have two frameless functions in a row. In this case,
- we use the same magic cookie for three frames in a row. We detect
- this case by seeing whether the next frame has
- SIGNAL_HANDLER_CALLER set, and, if it does, checking whether the
- current frame is actually frameless. In this case, we need to get
- the PC by looking at the SP register value stored in the signal
- context.
-
- This should work in most cases except in horrible situations where
- a signal occurs just as we enter a function but before the frame
- has been set up. */
-
-#define FRAMELESS_SIGNAL(FRAME) \
- ((FRAME)->next != NULL \
- && (FRAME)->next->signal_handler_caller \
- && frameless_look_for_prologue (FRAME))
-
#undef FRAME_CHAIN
-#define FRAME_CHAIN(FRAME) \
- ((FRAME)->signal_handler_caller \
- ? (FRAME)->frame \
- : (FRAMELESS_SIGNAL (FRAME) \
- ? (FRAME)->frame \
- : (!inside_entry_file ((FRAME)->pc) \
- ? read_memory_integer ((FRAME)->frame, 4) \
- : 0)))
+#define FRAME_CHAIN(frame) i386_linux_frame_chain (frame)
+extern CORE_ADDR i386_linux_frame_chain (struct frame_info *frame);
#undef FRAME_SAVED_PC
-#define FRAME_SAVED_PC(FRAME) \
- ((FRAME)->signal_handler_caller \
- ? sigtramp_saved_pc (FRAME) \
- : (FRAMELESS_SIGNAL (FRAME) \
- ? read_memory_integer (i386_linux_sigtramp_saved_sp ((FRAME)->next), 4) \
- : read_memory_integer ((FRAME)->frame + 4, 4)))
+#define FRAME_SAVED_PC(frame) i386_linux_frame_saved_pc (frame)
+extern CORE_ADDR i386_linux_frame_saved_pc (struct frame_info *frame);
-extern CORE_ADDR i386_linux_sigtramp_saved_sp (struct frame_info *);
+#undef SAVED_PC_AFTER_CALL
+#define SAVED_PC_AFTER_CALL(frame) i386_linux_saved_pc_after_call (frame)
+extern CORE_ADDR i386_linux_saved_pc_after_call (struct frame_info *);
+
+#define TARGET_WRITE_PC(pc, ptid) i386_linux_write_pc (pc, ptid)
+extern void i386_linux_write_pc (CORE_ADDR pc, ptid_t ptid);
/* When we call a function in a shared library, and the PLT sends us
into the dynamic linker to find the function's real address, we
/* N_FUN symbols in shared libaries have 0 for their values and need
to be relocated. */
#define SOFUN_ADDRESS_MAYBE_MISSING
+\f
+
+/* Support for longjmp. */
+
+/* Details about jmp_buf. It's supposed to be an array of integers. */
+
+#define JB_ELEMENT_SIZE 4 /* Size of elements in jmp_buf. */
+#define JB_PC 5 /* Array index of saved PC. */
+
+/* Figure out where the longjmp will land. Slurp the args out of the
+ stack. We expect the first arg to be a pointer to 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. */
+
+#define GET_LONGJMP_TARGET(addr) get_longjmp_target (addr)
+extern int get_longjmp_target (CORE_ADDR *addr);
#endif /* #ifndef TM_LINUX_H */
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