linux.h   [plain text]

/* Definitions for ia64-linux target.  */

/* This macro is a C statement to print on `stderr' a string describing the
   particular machine description choice.  */

#define TARGET_VERSION fprintf (stderr, " (IA-64) Linux");

/* This is for -profile to use -lc_p instead of -lc.  */
#undef CC1_SPEC
#define CC1_SPEC "%{profile:-p} %{G*}"

/* Target OS builtins.  */
#define TARGET_OS_CPP_BUILTINS()		\
do {						\
	builtin_assert("system=linux");		\
	builtin_define_std("linux");		\
	builtin_define_std("unix");		\
	builtin_define("__gnu_linux__");	\
	builtin_define("_LONGLONG");		\
} while (0)

/* Need to override linux.h STARTFILE_SPEC, since it has crtbeginT.o in.  */
#undef STARTFILE_SPEC
#define STARTFILE_SPEC \
  "%{!shared: \
     %{pg:gcrt1.o%s} %{!pg:%{p:gcrt1.o%s} \
		       %{!p:%{profile:gcrt1.o%s} \
			 %{!profile:crt1.o%s}}}} \
   crti.o%s %{!shared:crtbegin.o%s} %{shared:crtbeginS.o%s}"

/* Similar to standard Linux, but adding -ffast-math support.  */
#undef  ENDFILE_SPEC
#define ENDFILE_SPEC \
  "%{ffast-math|funsafe-math-optimizations:crtfastmath.o%s} \
   %{!shared:crtend.o%s} %{shared:crtendS.o%s} crtn.o%s"

/* Define this for shared library support because it isn't in the main
   linux.h file.  */

#undef LINK_SPEC
#define LINK_SPEC "\
  %{shared:-shared} \
  %{!shared: \
    %{!static: \
      %{rdynamic:-export-dynamic} \
      %{!dynamic-linker:-dynamic-linker /lib/ld-linux-ia64.so.2}} \
      %{static:-static}}"


#define JMP_BUF_SIZE  76

/* Override linux.h LINK_EH_SPEC definition.
   Signalize that because we have fde-glibc, we don't need all C shared libs
   linked against -lgcc_s.  */
#undef LINK_EH_SPEC
#define LINK_EH_SPEC ""

/* Do code reading to identify a signal frame, and set the frame
   state data appropriately.  See unwind-dw2.c for the structs.  */

#ifdef IN_LIBGCC2
#include <signal.h>
#include <sys/ucontext.h>

#define IA64_GATE_AREA_START 0xa000000000000100LL
#define IA64_GATE_AREA_END   0xa000000000020000LL

#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS)		\
  if ((CONTEXT)->rp >= IA64_GATE_AREA_START				\
      && (CONTEXT)->rp < IA64_GATE_AREA_END)				\
    {									\
      struct sigframe {							\
	char scratch[16];						\
	unsigned long sig_number;					\
	struct siginfo *info;						\
	struct sigcontext *sc;						\
      } *frame_ = (struct sigframe *)(CONTEXT)->psp;			\
      struct sigcontext *sc_ = frame_->sc;				\
									\
      /* Restore scratch registers in case the unwinder needs to	\
	 refer to a value stored in one of them.  */			\
      {									\
	int i_;								\
									\
	for (i_ = 2; i_ < 4; i_++)					\
	  (CONTEXT)->ireg[i_ - 2].loc = &sc_->sc_gr[i_];		\
	for (i_ = 8; i_ < 12; i_++)					\
	  (CONTEXT)->ireg[i_ - 2].loc = &sc_->sc_gr[i_];		\
	for (i_ = 14; i_ < 32; i_++)					\
	  (CONTEXT)->ireg[i_ - 2].loc = &sc_->sc_gr[i_];		\
      }									\
	  								\
      (CONTEXT)->pfs_loc = &(sc_->sc_ar_pfs);				\
      (CONTEXT)->lc_loc = &(sc_->sc_ar_lc);				\
      (CONTEXT)->unat_loc = &(sc_->sc_ar_unat);				\
      (CONTEXT)->br_loc[0] = &(sc_->sc_br[0]);				\
      (CONTEXT)->bsp = sc_->sc_ar_bsp;					\
      (CONTEXT)->pr = sc_->sc_pr;					\
      (CONTEXT)->psp = sc_->sc_gr[12];					\
      (CONTEXT)->gp = sc_->sc_gr[1];					\
      /* Signal frame doesn't have an associated reg. stack frame 	\
         other than what we adjust for below.	  */			\
      (FS) -> no_reg_stack_frame = 1;					\
									\
      /* Don't touch the branch registers o.t. b0.  The kernel doesn't	\
	 pass the preserved branch registers in the sigcontext but	\
	 leaves them intact, so there's no need to do anything		\
	 with them here.  */						\
									\
      {									\
	unsigned long sof = sc_->sc_cfm & 0x7f;				\
	(CONTEXT)->bsp = (unsigned long)				\
	  ia64_rse_skip_regs ((unsigned long *)(sc_->sc_ar_bsp), -sof); \
      }									\
									\
      (FS)->curr.reg[UNW_REG_RP].where = UNW_WHERE_SPREL;		\
      (FS)->curr.reg[UNW_REG_RP].val 					\
	= (unsigned long)&(sc_->sc_ip) - (CONTEXT)->psp;		\
      (FS)->curr.reg[UNW_REG_RP].when = -1;				\
									\
      goto SUCCESS;							\
    }
#endif /* IN_LIBGCC2 */