Commit 27267655 authored by Stafford Horne's avatar Stafford Horne
Browse files

openrisc: Support floating point user api 



Add support for handling floating point exceptions and forwarding the
SIGFPE signal to processes.  Also, add fpu state to sigcontext.

Signed-off-by: default avatarStafford Horne <shorne@gmail.com>
parent 63d7f9f1

arch/openrisc/include/uapi/asm/elf.h

+1 −2
Original line number Diff line number Diff line
@@ -53,8 +53,7 @@ typedef unsigned long elf_greg_t; 
#define ELF_NGREG (sizeof(struct user_regs_struct) / sizeof(elf_greg_t))

typedef elf_greg_t elf_gregset_t[ELF_NGREG];



/* A placeholder; OR32 does not have fp support yes, so no fp regs for now.  */

typedef unsigned long elf_fpregset_t;

typedef struct __or1k_fpu_state elf_fpregset_t;



/* EM_OPENRISC is defined in linux/elf-em.h */

#define EM_OR32         0x8472

arch/openrisc/include/uapi/asm/ptrace.h

+4 −0
Original line number Diff line number Diff line
@@ -30,6 +30,10 @@ struct user_regs_struct { 
	unsigned long pc;

	unsigned long sr;

};



struct __or1k_fpu_state {

	unsigned long fpcsr;

};

#endif

arch/openrisc/include/uapi/asm/sigcontext.h

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 


struct sigcontext {

	struct user_regs_struct regs;  /* needs to be first */

	struct __or1k_fpu_state fpu;

	unsigned long oldmask;

};

arch/openrisc/kernel/entry.S

+9 −2
Original line number Diff line number Diff line
@@ -848,9 +848,16 @@ _syscall_badsys: 


/******* END SYSCALL HANDLING *******/



/* ---[ 0xd00: Trap exception ]------------------------------------------ */

/* ---[ 0xd00: Floating Point exception ]-------------------------------- */



UNHANDLED_EXCEPTION(_vector_0xd00,0xd00)

EXCEPTION_ENTRY(_fpe_trap_handler)

	CLEAR_LWA_FLAG(r3)

	/* r4: EA of fault (set by EXCEPTION_HANDLE) */

	l.jal   do_fpe_trap

	 l.addi  r3,r1,0 /* pt_regs */



	l.j     _ret_from_exception

	 l.nop



/* ---[ 0xe00: Trap exception ]------------------------------------------ */

arch/openrisc/kernel/head.S

+2 −2
Original line number Diff line number Diff line
@@ -424,9 +424,9 @@ _dispatch_do_ipage_fault: 
    .org 0xc00

	EXCEPTION_HANDLE(_sys_call_handler)



/* ---[ 0xd00: Trap exception ]------------------------------------------ */

/* ---[ 0xd00: Floating point exception ]--------------------------------- */

    .org 0xd00

	UNHANDLED_EXCEPTION(_vector_0xd00)

	EXCEPTION_HANDLE(_fpe_trap_handler)



/* ---[ 0xe00: Trap exception ]------------------------------------------ */

    .org 0xe00