hppa: fix runtime issues

Sync clone()/vfork() with GNU C Library.
Allow CFI and fix strsignal() / tcsetattr().

1 files changed, 356 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/hppa/sysdep.h b/libc/sysdeps/linux/hppa/sysdep.h
new file mode 100644
index 000000000..57b0cba9b
--- /dev/null
+++ b/libc/sysdeps/linux/hppa/sysdep.h
@@ -0,0 +1,356 @@
+/* Assembler macros for PA-RISC.
+   Copyright (C) 1999-2018 Free Software Foundation, Inc.
+   Contributed by Ulrich Drepper, <drepper@cygnus.com>, August 1999.
+   Linux/PA-RISC changes by Philipp Rumpf, <prumpf@tux.org>, March 2000.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _LINUX_HPPA_SYSDEP_H
+#define _LINUX_HPPA_SYSDEP_H 1
+
+#include <common/sysdep.h>
+#include <sys/syscall.h>
+
+/* In order to get __set_errno() definition in INLINE_SYSCALL.  */
+#ifndef __ASSEMBLER__
+#include <errno.h>
+#endif
+
+#undef ASM_LINE_SEP
+#define ASM_LINE_SEP !
+
+#undef SYS_ify
+#define SYS_ify(syscall_name)	(__NR_##syscall_name)
+
+/* The vfork, fork, and clone syscalls clobber r19
+ * and r21. We list r21 as either clobbered or as an
+ * input to a 6-argument syscall. We must save and
+ * restore r19 in both PIC and non-PIC cases.
+ */
+/* WARNING: TREG must be a callee saves register so
+   that it doesn't have to be restored after a call
+   to another function */
+#define TREG 4
+#define SAVE_PIC(SREG) \
+	copy %r19, SREG
+#define LOAD_PIC(LREG) \
+	copy LREG , %r19
+/* Inline assembly defines */
+#define TREG_ASM "%r4" /* Cant clobber r3, it holds framemarker */
+#define SAVE_ASM_PIC	"       copy %%r19, %" TREG_ASM "\n"
+#define LOAD_ASM_PIC	"       copy %" TREG_ASM ", %%r19\n"
+#define CLOB_TREG	TREG_ASM ,
+#define PIC_REG_DEF	register unsigned long __r19 asm("r19");
+#define PIC_REG_USE	, "r" (__r19)
+
+#ifdef __ASSEMBLER__
+
+/* Syntactic details of assembler.  */
+
+#define ALIGNARG(log2) log2
+
+/* For Linux we can use the system call table in the header file
+	/usr/include/asm/unistd.h
+   of the kernel.  But these symbols do not follow the SYS_* syntax
+   so we have to redefine the `SYS_ify' macro here.  */
+#undef SYS_ify
+#define SYS_ify(syscall_name)	__NR_##syscall_name
+
+/* ELF-like local names start with `.L'.  */
+#undef L
+#define L(name)	.L##name
+
+/* Linux uses a negative return value to indicate syscall errors,
+   unlike most Unices, which use the condition codes' carry flag.
+
+   Since version 2.1 the return value of a system call might be
+   negative even if the call succeeded.  E.g., the `lseek' system call
+   might return a large offset.  Therefore we must not anymore test
+   for < 0, but test for a real error by making sure the value in %eax
+   is a real error number.  Linus said he will make sure the no syscall
+   returns a value in -1 .. -4095 as a valid result so we can safely
+   test with -4095.  */
+
+/* We don't want the label for the error handle to be global when we define
+   it here.  */
+/*#ifdef PIC
+# define SYSCALL_ERROR_LABEL 0f
+#else
+# define SYSCALL_ERROR_LABEL syscall_error
+#endif*/
+
+/* Argument manipulation from the stack for preparing to
+   make a syscall */
+
+#define DOARGS_0 /* nothing */
+#define DOARGS_1 /* nothing */
+#define DOARGS_2 /* nothing */
+#define DOARGS_3 /* nothing */
+#define DOARGS_4 /* nothing */
+#define DOARGS_5 ldw -52(%sp), %r22		ASM_LINE_SEP
+#define DOARGS_6 DOARGS_5 ldw -56(%sp), %r21	ASM_LINE_SEP
+
+#define UNDOARGS_0 /* nothing */
+#define UNDOARGS_1 /* nothing */
+#define UNDOARGS_2 /* nothing */
+#define UNDOARGS_3 /* nothing */
+#define UNDOARGS_4 /* nothing */
+#define UNDOARGS_5 /* nothing */
+#define UNDOARGS_6 /* nothing */
+
+/* Define an entry point visible from C.
+
+   There is currently a bug in gdb which prevents us from specifying
+   incomplete stabs information.  Fake some entries here which specify
+   the current source file.  */
+#undef ENTRY
+#define	ENTRY(name)							\
+	.text						ASM_LINE_SEP	\
+	.align ALIGNARG(4)				ASM_LINE_SEP	\
+	.export C_SYMBOL_NAME(name)			ASM_LINE_SEP	\
+	.type	C_SYMBOL_NAME(name),@function		ASM_LINE_SEP	\
+	cfi_startproc					ASM_LINE_SEP	\
+	C_LABEL(name)					ASM_LINE_SEP	\
+	.PROC						ASM_LINE_SEP	\
+	.CALLINFO FRAME=64,CALLS,SAVE_RP,ENTRY_GR=3	ASM_LINE_SEP	\
+	.ENTRY						ASM_LINE_SEP	\
+	/* SAVE_RP says we do */			ASM_LINE_SEP	\
+	stw %rp, -20(%sr0,%sp)				ASM_LINE_SEP	\
+	.cfi_offset 2, -20				ASM_LINE_SEP	\
+	/*FIXME: Call mcount? (carefull with stack!) */
+
+/* Some syscall wrappers do not call other functions, and
+   hence are classified as leaf, so add NO_CALLS for gdb */
+#define	ENTRY_LEAF(name)						\
+	.text						ASM_LINE_SEP	\
+	.align ALIGNARG(4)				ASM_LINE_SEP	\
+	.export C_SYMBOL_NAME(name)			ASM_LINE_SEP	\
+	.type	C_SYMBOL_NAME(name),@function		ASM_LINE_SEP	\
+	cfi_startproc					ASM_LINE_SEP	\
+	C_LABEL(name)					ASM_LINE_SEP	\
+	.PROC						ASM_LINE_SEP	\
+	.CALLINFO FRAME=64,NO_CALLS,SAVE_RP,ENTRY_GR=3	ASM_LINE_SEP	\
+	.ENTRY						ASM_LINE_SEP	\
+	/* SAVE_RP says we do */			ASM_LINE_SEP	\
+	stw %rp, -20(%sr0,%sp)				ASM_LINE_SEP	\
+	.cfi_offset 2, -20				ASM_LINE_SEP	\
+	/*FIXME: Call mcount? (carefull with stack!) */
+
+#undef	END
+#define END(name)							\
+	.EXIT						ASM_LINE_SEP	\
+	.PROCEND					ASM_LINE_SEP	\
+	cfi_endproc					ASM_LINE_SEP	\
+.size	C_SYMBOL_NAME(name), .-C_SYMBOL_NAME(name)	ASM_LINE_SEP
+
+/* If compiled for profiling, call `mcount' at the start
+   of each function. No, don't bother.  gcc will put the
+   call in for us.  */
+#define CALL_MCOUNT		/* Do nothing.  */
+
+/* syscall wrappers consist of
+	#include <sysdep.h>
+	PSEUDO(...)
+	ret
+	PSEUDO_END(...)
+
+   which means
+	ENTRY(name)
+	DO_CALL(...)
+	bv,n 0(2)
+*/
+
+#undef PSEUDO
+#define	PSEUDO(name, syscall_name, args)			\
+  ENTRY (name)					ASM_LINE_SEP	\
+  /* If necc. load args from stack */		ASM_LINE_SEP	\
+  DOARGS_##args					ASM_LINE_SEP	\
+  DO_CALL (syscall_name, args)			ASM_LINE_SEP	\
+  UNDOARGS_##args				ASM_LINE_SEP
+
+#define ret \
+  /* Return value set by ERRNO code */		ASM_LINE_SEP	\
+  bv,n 0(2)					ASM_LINE_SEP
+
+#undef	PSEUDO_END
+#define	PSEUDO_END(name)					\
+  END (name)
+
+/* We don't set the errno on the return from the syscall */
+#define	PSEUDO_NOERRNO(name, syscall_name, args)		\
+  ENTRY_LEAF (name)				ASM_LINE_SEP	\
+  DOARGS_##args					ASM_LINE_SEP	\
+  DO_CALL_NOERRNO (syscall_name, args)		ASM_LINE_SEP	\
+  UNDOARGS_##args				ASM_LINE_SEP
+
+#define ret_NOERRNO ret
+
+#undef	PSEUDO_END_NOERRNO
+#define	PSEUDO_END_NOERRNO(name)				\
+  END (name)
+
+/* This has to return the error value */
+#undef  PSEUDO_ERRVAL
+#define PSEUDO_ERRVAL(name, syscall_name, args)			\
+  ENTRY_LEAF (name)				ASM_LINE_SEP	\
+  DOARGS_##args					ASM_LINE_SEP	\
+  DO_CALL_ERRVAL (syscall_name, args)		ASM_LINE_SEP	\
+  UNDOARGS_##args				ASM_LINE_SEP
+
+#define ret_ERRVAL ret
+
+#undef	PSEUDO_END_ERRVAL
+#define PSEUDO_END_ERRVAL(name)					\
+	END(name)
+
+#undef JUMPTARGET
+#define JUMPTARGET(name)	name
+#define SYSCALL_PIC_SETUP	/* Nothing.  */
+
+
+/* FIXME: This comment is not true.
+ * All the syscall assembly macros rely on finding the appropriate
+   SYSCALL_ERROR_LABEL or rather HANDLER. */
+
+/* int * __errno_location(void) so you have to store your value
+   into the return address! */
+#define DEFAULT_SYSCALL_ERROR_HANDLER			\
+	.import __errno_location,code	ASM_LINE_SEP	\
+	/* branch to errno handler */	ASM_LINE_SEP	\
+	bl __errno_location,%rp		ASM_LINE_SEP
+
+/* Here are the myriad of configuration options that the above can
+   work for... what we've done is provide the framework for future
+   changes if required to each section */
+
+#ifdef __PIC__
+#  if defined _LIBC_REENTRANT
+#   define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+#  else /* !_LIBC_REENTRANT */
+#   define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+#  endif /* _LIBC_REENTRANT */
+#else
+# ifndef _LIBC_REENTRANT
+#  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# else
+#  define SYSCALL_ERROR_HANDLER DEFAULT_SYSCALL_ERROR_HANDLER
+# endif
+#endif
+
+
+/* Linux takes system call arguments in registers:
+	syscall number	gr20
+	arg 1		gr26
+	arg 2		gr25
+	arg 3		gr24
+	arg 4		gr23
+	arg 5		gr22
+	arg 6		gr21
+
+   The compiler calls us by the C convention:
+	syscall number	in the DO_CALL macro
+	arg 1		gr26
+	arg 2		gr25
+	arg 3		gr24
+	arg 4		gr23
+	arg 5		-52(sp)
+	arg 6		-56(sp)
+
+   gr22 and gr21 are caller-saves, so we can just load the arguments
+   there and generally be happy. */
+
+/* the cmpb...no_error code below inside DO_CALL
+ * is intended to mimic the if (__sys_res...)
+ * code inside INLINE_SYSCALL
+ */
+#define NO_ERROR -0x1000
+
+#undef	DO_CALL
+#define DO_CALL(syscall_name, args)				\
+	/* Create a frame */			ASM_LINE_SEP	\
+	stwm TREG, 64(%sp)			ASM_LINE_SEP	\
+	.cfi_def_cfa_offset -64			ASM_LINE_SEP	\
+	.cfi_offset TREG, 0			ASM_LINE_SEP	\
+	stw %sp, -4(%sp)			ASM_LINE_SEP	\
+	stw %r19, -32(%sp)			ASM_LINE_SEP	\
+	.cfi_offset 19, 32			ASM_LINE_SEP	\
+	/* Save r19 */				ASM_LINE_SEP	\
+	SAVE_PIC(TREG)				ASM_LINE_SEP	\
+	/* Do syscall, delay loads # */		ASM_LINE_SEP	\
+	ble  0x100(%sr2,%r0)			ASM_LINE_SEP	\
+	ldi SYS_ify (syscall_name), %r20	ASM_LINE_SEP	\
+	ldi NO_ERROR,%r1			ASM_LINE_SEP	\
+	cmpb,>>=,n %r1,%ret0,L(pre_end)		ASM_LINE_SEP	\
+	/* Restore r19 from TREG */		ASM_LINE_SEP	\
+	LOAD_PIC(TREG) /* delay */		ASM_LINE_SEP	\
+	SYSCALL_ERROR_HANDLER			ASM_LINE_SEP	\
+	/* Use TREG for temp storage */		ASM_LINE_SEP	\
+	copy %ret0, TREG /* delay */		ASM_LINE_SEP	\
+	/* OPTIMIZE: Don't reload r19 */	ASM_LINE_SEP	\
+	/* do a -1*syscall_ret0 */		ASM_LINE_SEP	\
+	sub %r0, TREG, TREG			ASM_LINE_SEP	\
+	/* Store into errno location */		ASM_LINE_SEP	\
+	stw TREG, 0(%sr0,%ret0)			ASM_LINE_SEP	\
+	/* return -1 as error */		ASM_LINE_SEP	\
+	ldo -1(%r0), %ret0			ASM_LINE_SEP	\
+L(pre_end):					ASM_LINE_SEP	\
+	/* Restore our frame, restoring TREG */	ASM_LINE_SEP	\
+	ldwm -64(%sp), TREG			ASM_LINE_SEP	\
+	/* Restore return pointer */		ASM_LINE_SEP	\
+	ldw -20(%sp),%rp			ASM_LINE_SEP
+
+/* We do nothing with the return, except hand it back to someone else */
+#undef  DO_CALL_NOERRNO
+#define DO_CALL_NOERRNO(syscall_name, args)			\
+	/* No need to store r19 */		ASM_LINE_SEP	\
+	ble  0x100(%sr2,%r0)                    ASM_LINE_SEP    \
+	ldi SYS_ify (syscall_name), %r20        ASM_LINE_SEP    \
+	/* Caller will restore r19 */		ASM_LINE_SEP
+
+/* Here, we return the ERRVAL in assembly, note we don't call the
+   error handler function, but we do 'negate' the return _IF_
+   it's an error. Not sure if this is the right semantic. */
+
+#undef	DO_CALL_ERRVAL
+#define DO_CALL_ERRVAL(syscall_name, args)			\
+	/* No need to store r19 */		ASM_LINE_SEP	\
+	ble  0x100(%sr2,%r0)			ASM_LINE_SEP	\
+	ldi SYS_ify (syscall_name), %r20	ASM_LINE_SEP	\
+	/* Caller will restore r19 */		ASM_LINE_SEP	\
+	ldi NO_ERROR,%r1			ASM_LINE_SEP	\
+	cmpb,>>=,n %r1,%ret0,0f			ASM_LINE_SEP	\
+	sub %r0, %ret0, %ret0			ASM_LINE_SEP	\
+0:						ASM_LINE_SEP
+
+
+#else
+
+/* GCC has to be warned that a syscall may clobber all the ABI
+   registers listed as "caller-saves", see page 8, Table 2
+   in section 2.2.6 of the PA-RISC RUN-TIME architecture
+   document. However! r28 is the result and will conflict with
+   the clobber list so it is left out. Also the input arguments
+   registers r20 -> r26 will conflict with the list so they
+   are treated specially. Although r19 is clobbered by the syscall
+   we cannot say this because it would violate ABI, thus we say
+   TREG is clobbered and use that register to save/restore r19
+   across the syscall. */
+
+#define CALL_CLOB_REGS	"%r1", "%r2", CLOB_TREG \
+			"%r20", "%r29", "%r31"
+
+#endif	/* __ASSEMBLER__ */
+
+#endif /* _LINUX_HPPA_SYSDEP_H */