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linux.h (MD_FALLBACK_FRAME_STATE_FOR): New

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* config/mips/linux.h (MD_FALLBACK_FRAME_STATE_FOR): New
	* config/mips/mips.h (DWARF_FRAME_REGNUM): Fixed to allow unwind
	from leaf functions.
	(DWARF_FRAME_RETURN_COLUMN): Ditto.
	(SIGNAL_UNWIND_RETURN_COLUMN): New, used
	by MD_FALLBACK_FRAME_STATE_FOR.
	* testsuite/gcc.dg/cleanup-9.c: Added mips*-*-linux* target.

From-SVN: r72536
This commit is contained in:
David Daney 2003-10-15 22:24:56 +00:00
parent 6492b8d80d
commit 1f3d066157
3 changed files with 77 additions and 4 deletions
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70
gcc/config/mips/linux.h
View File

@ -190,3 +190,73 @@ Boston, MA 02111-1307, USA. */
%{!static:-rpath-link %R/lib:%R/usr/lib} \
%{!shared: %{pthread:-lpthread} \
%{profile:-lc_p} %{!profile: -lc}}"
/* 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>
/* The third parameter to the signal handler points to something with
* this structure defined in asm/ucontext.h, but the name clashes with
* struct ucontext from sys/ucontext.h so this private copy is used. */
typedef struct _sig_ucontext {
unsigned long uc_flags;
struct _sig_ucontext *uc_link;
stack_t uc_stack;
struct sigcontext uc_mcontext;
sigset_t uc_sigmask;
} _sig_ucontext_t;
#endif /* IN_LIBGCC2 */
#define MD_FALLBACK_FRAME_STATE_FOR(CONTEXT, FS, SUCCESS) \
do { \
u_int32_t *pc_ = (u_int32_t *) (CONTEXT)->ra; \
struct sigcontext *sc_; \
_Unwind_Ptr new_cfa_; \
int i_; \
\
/* 24021061 li v0, 0x1061 (rt_sigreturn)*/ \
/* 0000000c syscall */ \
/* or */ \
/* 24021017 li v0, 0x1017 (sigreturn) */ \
/* 0000000c syscall */ \
if (*(pc_ + 1) != 0x0000000c) \
break; \
if (*(pc_ + 0) == 0x24021017) \
{ \
struct sigframe { \
u_int32_t trampoline[2]; \
struct sigcontext sigctx; \
} *rt_ = (CONTEXT)->ra; \
sc_ = &rt_->sigctx; \
} \
else if (*(pc_ + 0) == 0x24021061) \
{ \
struct rt_sigframe { \
u_int32_t trampoline[2]; \
struct siginfo info; \
_sig_ucontext_t uc; \
} *rt_ = (CONTEXT)->ra; \
sc_ = &rt_->uc.uc_mcontext; \
} \
else \
break; \
\
new_cfa_ = (_Unwind_Ptr)sc_; \
(FS)->cfa_how = CFA_REG_OFFSET; \
(FS)->cfa_reg = STACK_POINTER_REGNUM; \
(FS)->cfa_offset = new_cfa_ - (_Unwind_Ptr) (CONTEXT)->cfa; \
\
for (i_ = 0; i_ < 32; i_++) { \
(FS)->regs.reg[i_].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[i_].loc.offset \
= (_Unwind_Ptr)&(sc_->sc_regs[i_]) - new_cfa_; \
} \
(FS)->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].how = REG_SAVED_OFFSET; \
(FS)->regs.reg[SIGNAL_UNWIND_RETURN_COLUMN].loc.offset \
= (_Unwind_Ptr)&(sc_->sc_pc) - new_cfa_; \
(FS)->retaddr_column = SIGNAL_UNWIND_RETURN_COLUMN; \
\
goto SUCCESS; \
} while (0)

9
gcc/config/mips/mips.h
View File

@ -1216,11 +1216,14 @@ extern const struct mips_cpu_info *mips_tune_info;
#define DBX_REGISTER_NUMBER(REGNO) mips_dbx_regno[ (REGNO) ]
/* The mapping from gcc register number to DWARF 2 CFA column number. */
#define DWARF_FRAME_REGNUM(REG) \
(REG == GP_REG_FIRST + 31 ? DWARF_FRAME_RETURN_COLUMN : REG)
#define DWARF_FRAME_REGNUM(REG) (REG)
/* The DWARF 2 CFA column which tracks the return address. */
#define DWARF_FRAME_RETURN_COLUMN (FP_REG_LAST + 1)
#define DWARF_FRAME_RETURN_COLUMN (GP_REG_FIRST + 31)
/* The DWARF 2 CFA column which tracks the return address from a
signal handler context. */
#define SIGNAL_UNWIND_RETURN_COLUMN (FP_REG_LAST + 1)
/* Before the prologue, RA lives in r31. */
#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (VOIDmode, GP_REG_FIRST + 31)

2
gcc/testsuite/gcc.dg/cleanup-9.c
View File

@ -1,4 +1,4 @@
/* { dg-do run { target i?86-*-linux* x86_64-*-linux* ia64-*-linux* alpha*-*-linux* powerpc*-*-linux* s390*-*-linux* sparc*-*-linux* } } */
/* { dg-do run { target i?86-*-linux* x86_64-*-linux* ia64-*-linux* alpha*-*-linux* powerpc*-*-linux* s390*-*-linux* sparc*-*-linux* mips*-*-linux* } } */
/* { dg-options "-fasynchronous-unwind-tables -fexceptions -O2" } */
/* Verify that cleanups work with exception handling through realtime
signal frames. */