Merge are.twiddle.net:/home/rth/BK/linus-2.5

into are.twiddle.net:/home/rth/BK/axp-2.5

arch/alpha/kernel/entry.S

@@ -452,7 +452,8 @@ sys_fork:
 	bsr	$1,do_switch_stack
 	bis	$31,SIGCHLD,$16
 	mov	$31,$17
-	mov	$30,$18
+	mov	$31,$18
+	mov	$30,$19
 	jsr	$26,alpha_clone
 	bsr	$1,undo_switch_stack
 	ret	$31,($26),1
@@ -463,8 +464,9 @@ sys_fork:
 .ent	sys_clone
 sys_clone:
 	bsr	$1,do_switch_stack
-	/* arg1 and arg2 come from the user */
-	mov	$30,$18
+	/* $16, $17, $18, $19 come from the user; $19 is used later
+	   via pt_regs->r19.  */
+	mov	$30,$19
 	jsr	$26,alpha_clone
 	bsr	$1,undo_switch_stack
 	ret	$31,($26),1

arch/alpha/kernel/osf_sys.c

@@ -844,7 +844,7 @@ osf_setsysinfo(unsigned long op, void *buffer, unsigned long nbytes,
 {
 	switch (op) {
 	case SSI_IEEE_FP_CONTROL: {
-		unsigned long swcr, fpcr;
+		unsigned long swcr, fpcr, fex;
 
 		/* 
 		 * Alpha Architecture Handbook 4.7.7.3:
@@ -867,9 +867,24 @@ osf_setsysinfo(unsigned long op, void *buffer, unsigned long nbytes,
 		wrfpcr(fpcr);
 
  		/* If any exceptions are now unmasked, send a signal.  */
- 		if (((swcr & IEEE_STATUS_MASK)
- 		     >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr) {
- 			send_sig(SIGFPE, current, 1);
+		fex = ((swcr & IEEE_STATUS_MASK)
+		       >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
+ 		if (fex) {
+			siginfo_t info;
+			int si_code = 0;
+
+			if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
+			if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
+			if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
+			if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
+			if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
+			if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;
+
+			info.si_signo = SIGFPE;
+			info.si_errno = 0;
+			info.si_code = si_code;
+			info.si_addr = 0;  /* FIXME */
+ 			send_sig_info(SIGFPE, &info, current);
  		}
 
 		return 0;

arch/alpha/kernel/process.c

@@ -245,11 +245,10 @@ release_thread(struct task_struct *dead_task)
  */
 int
 alpha_clone(unsigned long clone_flags, unsigned long usp,
-	    struct switch_stack * swstack)
+	    int *user_tid, struct switch_stack * swstack)
 {
 	struct task_struct *p;
 	struct pt_regs *u_regs = (struct pt_regs *) (swstack+1);
-	int *user_tid = (int *)u_regs->r19;
 
 	if (!usp)
 		usp = rdusp();
@@ -314,6 +313,10 @@ copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 	childti->pcb.ksp = (unsigned long) childstack;
 	childti->pcb.flags = 1;	/* set FEN, clear everything else */
 
+	/* Set a new TLS for the child thread?  Peek back into the
+	   syscall arguments that we saved on syscall entry.  */
+	childti->pcb.unique = (clone_flags & CLONE_SETTLS ? regs->r19 : 0);
+
 	return 0;
 }
 

arch/alpha/kernel/signal.c

@@ -293,8 +293,16 @@ do_sigreturn(struct sigframe *frame, struct pt_regs *regs,
 		goto give_sigsegv;
 
 	/* Send SIGTRAP if we're single-stepping: */
-	if (ptrace_cancel_bpt (current))
-		send_sig(SIGTRAP, current, 1);
+	if (ptrace_cancel_bpt (current)) {
+		siginfo_t info;
+
+		info.si_signo = SIGTRAP;
+		info.si_errno = 0;
+		info.si_code = TRAP_BRKPT;
+		info.si_addr = (void *) regs->pc;
+		info.si_trapno = 0;
+		send_sig_info(SIGTRAP, &info, current);
+	}
 	return;
 
 give_sigsegv:
@@ -330,8 +338,16 @@ do_rt_sigreturn(struct rt_sigframe *frame, struct pt_regs *regs,
 	do_sigaltstack(&st, NULL, rdusp());
 
 	/* Send SIGTRAP if we're single-stepping: */
-	if (ptrace_cancel_bpt (current))
-		send_sig(SIGTRAP, current, 1);
+	if (ptrace_cancel_bpt (current)) {
+		siginfo_t info;
+
+		info.si_signo = SIGTRAP;
+		info.si_errno = 0;
+		info.si_code = TRAP_BRKPT;
+		info.si_addr = (void *) regs->pc;
+		info.si_trapno = 0;
+		send_sig_info(SIGTRAP, &info, current);
+	}
 	return;
 
 give_sigsegv:

arch/alpha/kernel/traps.c

@@ -213,25 +213,25 @@ do_entArith(unsigned long summary, unsigned long write_mask,
 	    unsigned long a2, unsigned long a3, unsigned long a4,
 	    unsigned long a5, struct pt_regs regs)
 {
+	long si_code = FPE_FLTINV;
+	siginfo_t info;
+
 	if (summary & 1) {
 		/* Software-completion summary bit is set, so try to
-		   emulate the instruction.  */
-		if (!amask(AMASK_PRECISE_TRAP)) {
-			/* 21264 (except pass 1) has precise exceptions.  */
-			if (alpha_fp_emul(regs.pc - 4))
-				return;
-		} else {
-			if (alpha_fp_emul_imprecise(&regs, write_mask))
-				return;
-		}
+		   emulate the instruction.  If the processor supports
+		   precise exceptions, we don't have to search.  */
+		if (!amask(AMASK_PRECISE_TRAP))
+			si_code = alpha_fp_emul(regs.pc - 4);
+		else
+			si_code = alpha_fp_emul_imprecise(&regs, write_mask);
 	}
-
-#if 0
-	printk("%s: arithmetic trap at %016lx: %02lx %016lx\n",
-		current->comm, regs.pc, summary, write_mask);
-#endif
 	die_if_kernel("Arithmetic fault", &regs, 0, 0);
-	send_sig(SIGFPE, current, 1);
+
+	info.si_signo = SIGFPE;
+	info.si_errno = 0;
+	info.si_code = si_code;
+	info.si_addr = (void *) regs.pc;
+	send_sig_info(SIGFPE, &info, current);
 }
 
 asmlinkage void
@@ -239,6 +239,9 @@ do_entIF(unsigned long type, unsigned long a1,
 	 unsigned long a2, unsigned long a3, unsigned long a4,
 	 unsigned long a5, struct pt_regs regs)
 {
+	siginfo_t info;
+	int signo, code;
+
 	if (!opDEC_testing || type != 4) {
 		if (type == 1) {
 			const unsigned int *data
@@ -253,30 +256,64 @@ do_entIF(unsigned long type, unsigned long a1,
 
 	switch (type) {
 	      case 0: /* breakpoint */
+		info.si_signo = SIGTRAP;
+		info.si_errno = 0;
+		info.si_code = TRAP_BRKPT;
+		info.si_trapno = 0;
+		info.si_addr = (void *) regs.pc;
+
 		if (ptrace_cancel_bpt(current)) {
 			regs.pc -= 4;	/* make pc point to former bpt */
 		}
-		send_sig(SIGTRAP, current, 1);
+
+		send_sig_info(SIGTRAP, &info, current);
 		return;
 
 	      case 1: /* bugcheck */
-		send_sig(SIGTRAP, current, 1);
+		info.si_signo = SIGTRAP;
+		info.si_errno = 0;
+		info.si_code = __SI_FAULT;
+		info.si_addr = (void *) regs.pc;
+		info.si_trapno = 0;
+		send_sig_info(SIGTRAP, &info, current);
 		return;
 		
 	      case 2: /* gentrap */
-		/*
-		 * The exception code should be passed on to the signal
-		 * handler as the second argument.  Linux doesn't do that
-		 * yet (also notice that Linux *always* behaves like
-		 * DEC Unix with SA_SIGINFO off; see DEC Unix man page
-		 * for sigaction(2)).
-		 */
+		info.si_addr = (void *) regs.pc;
+		info.si_trapno = regs.r16;
 		switch ((long) regs.r16) {
-		      case GEN_INTOVF: case GEN_INTDIV: case GEN_FLTOVF:
-		      case GEN_FLTDIV: case GEN_FLTUND: case GEN_FLTINV:
-		      case GEN_FLTINE: case GEN_ROPRAND:
-			send_sig(SIGFPE, current, 1);
-			return;
+		case GEN_INTOVF:
+			signo = SIGFPE;
+			code = FPE_INTOVF;
+			break;
+		case GEN_INTDIV:
+			signo = SIGFPE;
+			code = FPE_INTDIV;
+			break;
+		case GEN_FLTOVF:
+			signo = SIGFPE;
+			code = FPE_FLTOVF;
+			break;
+		case GEN_FLTDIV:
+			signo = SIGFPE;
+			code = FPE_FLTDIV;
+			break;
+		case GEN_FLTUND:
+			signo = SIGFPE;
+			code = FPE_FLTUND;
+			break;
+		case GEN_FLTINV:
+			signo = SIGFPE;
+			code = FPE_FLTINV;
+			break;
+		case GEN_FLTINE:
+			signo = SIGFPE;
+			code = FPE_FLTRES;
+			break;
+		case GEN_ROPRAND:
+			signo = SIGFPE;
+			code = __SI_FAULT;
+			break;
 
 		case GEN_DECOVF:
 		case GEN_DECDIV:
@@ -295,13 +332,23 @@ do_entIF(unsigned long type, unsigned long a1,
 		case GEN_SUBRNG5:
 		case GEN_SUBRNG6:
 		case GEN_SUBRNG7:
-			send_sig(SIGTRAP, current, 1);
-			return;
-		}
+		default:
+			signo = SIGTRAP;
+			code = __SI_FAULT;
 			break;
+		}
+
+		info.si_signo = signo;
+		info.si_errno = 0;
+		info.si_code = code;
+		info.si_addr = (void *) regs.pc;
+		send_sig_info(signo, &info, current);
+		return;
 
 	      case 4: /* opDEC */
 		if (implver() == IMPLVER_EV4) {
+			long si_code;
+
 			/* The some versions of SRM do not handle
 			   the opDEC properly - they return the PC of the
 			   opDEC fault, not the instruction after as the
@@ -309,8 +356,7 @@ do_entIF(unsigned long type, unsigned long a1,
 			   We do this by intentionally causing an opDEC
 			   fault during the boot sequence and testing if
 			   we get the correct PC.  If not, we set a flag
-			   to correct it every time through.
-			*/
+			   to correct it every time through.  */
 			if (opDEC_testing) {
 				if (regs.pc == opDEC_test_pc) {
 					opDEC_fix = 4;
@@ -324,9 +370,18 @@ do_entIF(unsigned long type, unsigned long a1,
 			/* EV4 does not implement anything except normal
 			   rounding.  Everything else will come here as
 			   an illegal instruction.  Emulate them.  */
-			if (alpha_fp_emul(regs.pc-4))
+			si_code = alpha_fp_emul(regs.pc - 4);
+			if (si_code == 0)
+				return;
+			if (si_code > 0) {
+				info.si_signo = SIGFPE;
+				info.si_errno = 0;
+				info.si_code = si_code;
+				info.si_addr = (void *) regs.pc;
+				send_sig_info(SIGFPE, &info, current);
 				return;
 			}
+		}
 		break;
 
 	      case 3: /* FEN fault */
@@ -347,7 +402,12 @@ do_entIF(unsigned long type, unsigned long a1,
 	      default: /* unexpected instruction-fault type */
 		      ;
 	}
-	send_sig(SIGILL, current, 1);
+
+	info.si_signo = SIGILL;
+	info.si_errno = 0;
+	info.si_code = ILL_ILLOPC;
+	info.si_addr = regs.pc;
+	send_sig_info(SIGILL, &info, current);
 }
 
 /* There is an ifdef in the PALcode in MILO that enables a 
@@ -362,8 +422,15 @@ do_entDbg(unsigned long type, unsigned long a1,
 	  unsigned long a2, unsigned long a3, unsigned long a4,
 	  unsigned long a5, struct pt_regs regs)
 {
+	siginfo_t info;
+
 	die_if_kernel("Instruction fault", &regs, type, 0);
-	force_sig(SIGILL, current);
+
+	info.si_signo = SIGILL;
+	info.si_errno = 0;
+	info.si_code = ILL_ILLOPC;
+	info.si_addr = regs.pc;
+	force_sig_info(SIGILL, &info, current);
 }
 
 
@@ -720,6 +787,7 @@ do_entUnaUser(void * va, unsigned long opcode,
 
 	unsigned long tmp1, tmp2, tmp3, tmp4;
 	unsigned long fake_reg, *reg_addr = &fake_reg;
+	siginfo_t info;
 	long error;
 
 	/* Check the UAC bits to decide what the user wants us to do
@@ -984,12 +1052,34 @@ do_entUnaUser(void * va, unsigned long opcode,
 
 give_sigsegv:
 	regs->pc -= 4;  /* make pc point to faulting insn */
-	send_sig(SIGSEGV, current, 1);
+	info.si_signo = SIGSEGV;
+	info.si_errno = 0;
+
+	/* We need to replicate some of the logic in mm/fault.c,
+	   since we don't have access to the fault code in the
+	   exception handling return path.  */
+	if (!__access_ok((unsigned long)va, 0, USER_DS))
+		info.si_code = SEGV_ACCERR;
+	else {
+		struct mm_struct *mm = current->mm;
+		down_read(&mm->mmap_sem);
+		if (find_vma(mm, (unsigned long)va))
+			info.si_code = SEGV_ACCERR;
+		else
+			info.si_code = SEGV_MAPERR;
+		up_read(&mm->mmap_sem);
+	}
+	info.si_addr = va;
+	send_sig_info(SIGSEGV, &info, current);
 	return;
 
 give_sigbus:
 	regs->pc -= 4;
-	send_sig(SIGBUS, current, 1);
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code = BUS_ADRALN;
+	info.si_addr = va;
+	send_sig_info(SIGBUS, &info, current);
 	return;
 }
 

arch/alpha/math-emu/math.c

@@ -86,11 +86,13 @@ void cleanup_module(void)
 
 
 /*
- * Emulate the floating point instruction at address PC.  Returns 0 if
- * emulation fails.  Notice that the kernel does not and cannot use FP
- * regs.  This is good because it means that instead of
- * saving/restoring all fp regs, we simply stick the result of the
- * operation into the appropriate register.
+ * Emulate the floating point instruction at address PC.  Returns -1 if the
+ * instruction to be emulated is illegal (such as with the opDEC trap), else
+ * the SI_CODE for a SIGFPE signal, else 0 if everything's ok.
+ *
+ * Notice that the kernel does not and cannot use FP regs.  This is good
+ * because it means that instead of saving/restoring all fp regs, we simply
+ * stick the result of the operation into the appropriate register.
  */
 long
 alpha_fp_emul (unsigned long pc)
@@ -102,6 +104,7 @@ alpha_fp_emul (unsigned long pc)
 	unsigned long fa, fb, fc, func, mode, src;
 	unsigned long res, va, vb, vc, swcr, fpcr;
 	__u32 insn;
+	long si_code;
 
 	MOD_INC_USE_COUNT;
 
@@ -306,10 +309,19 @@ alpha_fp_emul (unsigned long pc)
 		wrfpcr(fpcr);
 
 		/* Do we generate a signal?  */
-		if (_fex & swcr & IEEE_TRAP_ENABLE_MASK) {
-			MOD_DEC_USE_COUNT;
-			return 0;
+		_fex = _fex & swcr & IEEE_TRAP_ENABLE_MASK;
+		si_code = 0;
+		if (_fex) {
+			if (_fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
+			if (_fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
+			if (_fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
+			if (_fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
+			if (_fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
+			if (_fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;
 		}
+
+		MOD_DEC_USE_COUNT;
+		return si_code;
 	}
 
 	/* We used to write the destination register here, but DEC FORTRAN
@@ -317,20 +329,20 @@ alpha_fp_emul (unsigned long pc)
 	   immediately after the operations above.  */
 
 	MOD_DEC_USE_COUNT;
-	return 1;
+	return 0;
 
 bad_insn:
 	printk(KERN_ERR "alpha_fp_emul: Invalid FP insn %#x at %#lx\n",
 	       insn, pc);
 	MOD_DEC_USE_COUNT;
-	return 0;
+	return -1;
 }
 
 long
 alpha_fp_emul_imprecise (struct pt_regs *regs, unsigned long write_mask)
 {
 	unsigned long trigger_pc = regs->pc - 4;
-	unsigned long insn, opcode, rc, no_signal = 0;
+	unsigned long insn, opcode, rc, si_code = 0;
 
 	MOD_INC_USE_COUNT;
 
@@ -384,7 +396,7 @@ alpha_fp_emul_imprecise (struct pt_regs *regs, unsigned long write_mask)
 		if (!write_mask) {
 			/* Re-execute insns in the trap-shadow.  */
 			regs->pc = trigger_pc + 4;
-			no_signal = alpha_fp_emul(trigger_pc);
+			si_code = alpha_fp_emul(trigger_pc);
 			goto egress;
 		}
 		trigger_pc -= 4;
@@ -392,5 +404,5 @@ alpha_fp_emul_imprecise (struct pt_regs *regs, unsigned long write_mask)
 
 egress:
 	MOD_DEC_USE_COUNT;
-	return no_signal;
+	return si_code;
 }

arch/alpha/mm/fault.c

@@ -89,7 +89,8 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
 	struct vm_area_struct * vma;
 	struct mm_struct *mm = current->mm;
 	unsigned int fixup;
-	int fault;
+	int fault, si_code = SEGV_MAPERR;
+	siginfo_t info;
 
 	/* As of EV6, a load into $31/$f31 is a prefetch, and never faults
 	   (or is suppressed by the PALcode).  Support that for older CPUs
@@ -129,6 +130,7 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
 	/* Ok, we have a good vm_area for this memory access, so
 	   we can handle it.  */
  good_area:
+	si_code = SEGV_ACCERR;
 	if (cause < 0) {
 		if (!(vma->vm_flags & VM_EXEC))
 			goto bad_area;
@@ -148,10 +150,20 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
 	fault = handle_mm_fault(mm, vma, address, cause > 0);
 	up_read(&mm->mmap_sem);
 
-	if (fault < 0)
-		goto out_of_memory;
-	if (fault == 0)
+	switch (fault) {
+	      case VM_FAULT_MINOR:
+		current->min_flt++;
+		break;
+	      case VM_FAULT_MAJOR:
+		current->maj_flt++;
+		break;
+	      case VM_FAULT_SIGBUS:
 		goto do_sigbus;
+	      case VM_FAULT_OOM:
+		goto out_of_memory;
+	      default:
+		BUG();
+	}
 	return;
 
 	/* Something tried to access memory that isn't in our memory map.
@@ -159,20 +171,14 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
  bad_area:
 	up_read(&mm->mmap_sem);
 
-	if (user_mode(regs)) {
-		force_sig(SIGSEGV, current);
-		return;
-	}
+	if (user_mode(regs))
+		goto do_sigsegv;
 
  no_context:
 	/* Are we prepared to handle this fault as an exception?  */
 	if ((fixup = search_exception_table(regs->pc, regs->gp)) != 0) {
 		unsigned long newpc;
 		newpc = fixup_exception(dpf_reg, fixup, regs->pc);
-#if 0
-		printk("%s: Exception at [<%lx>] (%lx) handled successfully\n",
-		       current->comm, regs->pc, newpc);
-#endif
 		regs->pc = newpc;
 		return;
 	}
@@ -201,17 +207,28 @@ do_page_fault(unsigned long address, unsigned long mmcsr,
  do_sigbus:
 	/* Send a sigbus, regardless of whether we were in kernel
 	   or user mode.  */
-	force_sig(SIGBUS, current);
+	info.si_signo = SIGBUS;
+	info.si_errno = 0;
+	info.si_code = BUS_ADRERR;
+	info.si_addr = (void *) address;
+	force_sig_info(SIGBUS, &info, current);
 	if (!user_mode(regs))
 		goto no_context;
 	return;
 
+ do_sigsegv:
+	info.si_signo = SIGSEGV;
+	info.si_errno = 0;
+	info.si_code = si_code;
+	info.si_addr = (void *) address;
+	force_sig_info(SIGSEGV, &info, current);
+	return;
+
 #ifdef CONFIG_ALPHA_LARGE_VMALLOC
  vmalloc_fault:
-	if (user_mode(regs)) {
-		force_sig(SIGSEGV, current);
-		return;
-	} else {
+	if (user_mode(regs))
+		goto do_sigsegv;
+	else {
 		/* Synchronize this task's top level page-table
 		   with the "reference" page table from init.  */
 		long offset = __pgd_offset(address);

include/asm-alpha/siginfo.h

 #ifndef _ALPHA_SIGINFO_H
 #define _ALPHA_SIGINFO_H
 
-#define SI_PAD_SIZE	((SI_MAX_SIZE/sizeof(int)) - 4)
+#define __ARCH_SI_PREAMBLE_SIZE		(4 * sizeof(int))
+#define __ARCH_SI_TRAPNO
 
 #define SIGEV_PAD_SIZE			((SIGEV_MAX_SIZE/sizeof(int)) - 4)
 
-#define HAVE_ARCH_COPY_SIGINFO
-
 #include <asm-generic/siginfo.h>
 
-#ifdef __KERNEL__
-#include <linux/string.h>
-
-extern inline void copy_siginfo(siginfo_t *to, siginfo_t *from)
-{
-	if (from->si_code < 0)
-		memcpy(to, from, sizeof(siginfo_t));
-	else
-		/* _sigchld is currently the largest know union member */
-		memcpy(to, from, 4*sizeof(int) + sizeof(from->_sifields._sigchld));
-}
-
-#endif /* __KERNEL__ */
-
 #endif