diff options
Diffstat (limited to 'libc/sysdeps/linux')
| -rw-r--r-- | libc/sysdeps/linux/hppa/Makefile.arch | 2 | ||||
| -rw-r--r-- | libc/sysdeps/linux/hppa/bits/ioctls.h | 35 | ||||
| -rw-r--r-- | libc/sysdeps/linux/hppa/bits/uClibc_arch_features.h | 2 | ||||
| -rw-r--r-- | libc/sysdeps/linux/hppa/clone.S | 154 | ||||
| -rw-r--r-- | libc/sysdeps/linux/hppa/sysdep.h | 356 | ||||
| -rw-r--r-- | libc/sysdeps/linux/hppa/vfork.S | 82 |
6 files changed, 566 insertions, 65 deletions
diff --git a/libc/sysdeps/linux/hppa/Makefile.arch b/libc/sysdeps/linux/hppa/Makefile.arch index 621a5b314..90cf5a4bc 100644 --- a/libc/sysdeps/linux/hppa/Makefile.arch +++ b/libc/sysdeps/linux/hppa/Makefile.arch @@ -8,4 +8,4 @@ CSRC-y := __syscall_error.c brk.c syscall.c SSRC-y := __longjmp.S bsd-_setjmp.S bsd-setjmp.S clone.S setjmp.S \ - add_n.s lshift.s rshift.s sub_n.s udiv_qrnnd.s + add_n.s lshift.s rshift.s sub_n.s udiv_qrnnd.s vfork.S diff --git a/libc/sysdeps/linux/hppa/bits/ioctls.h b/libc/sysdeps/linux/hppa/bits/ioctls.h new file mode 100644 index 000000000..99ecb0ff1 --- /dev/null +++ b/libc/sysdeps/linux/hppa/bits/ioctls.h @@ -0,0 +1,35 @@ +/* Copyright (C) 1996-2018 Free Software Foundation, Inc. + + 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 _SYS_IOCTL_H +# error "Never use <bits/ioctls.h> directly; include <sys/ioctl.h> instead." +#endif + +/* Use the definitions from the kernel header files. */ +#include <asm/ioctls.h> + +/* Oh well, this is necessary since the kernel data structure is + different from the user-level version. */ +#undef TCGETS +#undef TCSETS +#undef TCSETSW +#undef TCSETSF +#define TCGETS _IOR ('T', 16, char[36]) +#define TCSETS _IOW ('T', 17, char[36]) +#define TCSETSW _IOW ('T', 18, char[36]) +#define TCSETSF _IOW ('T', 19, char[36]) + +#include <linux/sockios.h> diff --git a/libc/sysdeps/linux/hppa/bits/uClibc_arch_features.h b/libc/sysdeps/linux/hppa/bits/uClibc_arch_features.h index 19fa05109..1c096bd17 100644 --- a/libc/sysdeps/linux/hppa/bits/uClibc_arch_features.h +++ b/libc/sysdeps/linux/hppa/bits/uClibc_arch_features.h @@ -30,7 +30,7 @@ #undef __UCLIBC_HAVE_ASM_WEAKEXT_DIRECTIVE__ /* define if target supports CFI pseudo ops */ -#undef __UCLIBC_HAVE_ASM_CFI_DIRECTIVES__ +#define __UCLIBC_HAVE_ASM_CFI_DIRECTIVES__ /* define if target supports IEEE signed zero floats */ #define __UCLIBC_HAVE_SIGNED_ZERO__ diff --git a/libc/sysdeps/linux/hppa/clone.S b/libc/sysdeps/linux/hppa/clone.S index f6c153b01..8356d9a74 100644 --- a/libc/sysdeps/linux/hppa/clone.S +++ b/libc/sysdeps/linux/hppa/clone.S @@ -1,5 +1,4 @@ -/* Copyright (C) 1996, 1997, 2000 Free Software Foundation, Inc. - This file is part of the GNU C Library. +/* Copyright (C) 1996-2018 Free Software Foundation, Inc. Contributed by David Huggins-Daines <dhd@debian.org>, 2000. Based on the Alpha version by Richard Henderson <rth@tamu.edu>, 1996. @@ -14,27 +13,35 @@ 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 + License along with the GNU C Library. If not, see <http://www.gnu.org/licenses/>. */ /* clone() is even more special than fork() as it mucks with stacks and invokes a function in the right context after its all over. */ #include <asm/unistd.h> +#include <sysdep.h> #define _ERRNO_H 1 #include <bits/errno.h> -#include <sys/syscall.h> /* Non-thread code calls __clone with the following parameters: - int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg) - + int clone(int (*fn)(void *arg), + void *child_stack, + int flags, + void *arg) + NPTL Code will call __clone with the following parameters: - int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg, - int *parent_tidptr, struct user_desc *newtls, int *child_pidptr) - + int clone(int (*fn)(void *arg), + void *child_stack, + int flags, + void *arg, + int *parent_tidptr, + struct user_desc *newtls, + int *child_pidptr) + The code should not mangle the extra input registers. Syscall expects: Input to __clone: - 4(r25) - function pointer (r26, arg0) + 4(r25) - function pointer (r26, arg0) 0(r25) - argument (r23, arg3) r26 - clone flags. (r24, arg2) r25+64 - user stack pointer. (r25, arg1) @@ -42,93 +49,114 @@ r23 - struct user_desc newtls pointer. (stack - 56) r22 - child tid pointer. (stack - 60) r20 - clone syscall number (constant) + + Return: + + On success the thread ID of the child process is returend in + the callers context. + On error return -1, and set errno to the value returned by + the syscall. */ -.text -.global __clone -.type __clone,%function -__clone: + .text +ENTRY(__clone) + /* Prologue */ + stwm %r4, 64(%sp) + .cfi_def_cfa_offset -64 + .cfi_offset 4, 0 + stw %sp, -4(%sp) +#ifdef __PIC__ + stw %r19, -32(%sp) + .cfi_offset 19, 32 +#endif /* Sanity check arguments. */ - ldi -EINVAL,%ret0 - comib,=,n 0,%arg0,.Lerror /* no NULL function pointers */ - comib,=,n 0,%arg1,.Lerror /* no NULL stack pointers */ + comib,=,n 0, %arg0, .LerrorSanity /* no NULL function pointers */ + comib,=,n 0, %arg1, .LerrorSanity /* no NULL stack pointers */ - /* Save the fn ptr and arg on the new stack. */ - stwm %r26,64(%r25) - stw %r23,-60(%r25) + /* Save the function pointer, arg, and flags on the new stack. */ + stwm %r26, 64(%r25) + stw %r23, -60(%r25) + stw %r24, -56(%r25) /* Clone arguments are (int flags, void * child_stack) */ - copy %r24,%r26 /* flags are first */ + copy %r24, %r26 /* flags are first */ /* User stack pointer is in the correct register already */ /* Load args from stack... */ - ldw -52(%sp), %r24 /* Load parent_tidptr */ - ldw -56(%sp), %r23 /* Load newtls */ - ldw -60(%sp), %r22 /* Load child_tidptr */ - - /* Create frame to get r3 free */ - copy %sp, %r21 - stwm %r3, 64(%sp) - stw %r21, -4(%sp) + ldw -116(%sp), %r24 /* Load parent_tidptr */ + ldw -120(%sp), %r23 /* Load newtls */ + ldw -124(%sp), %r22 /* Load child_tidptr */ /* Save the PIC register. */ #ifdef __PIC__ - copy %r19, %r3 /* parent */ + copy %r19, %r4 /* parent */ #endif /* Do the system call */ - ble 0x100(%sr2,%r0) - ldi __NR_clone,%r20 + ble 0x100(%sr2, %r0) + ldi __NR_clone, %r20 - ldi -4096,%r1 - comclr,>>= %r1,%ret0,%r0 /* Note: unsigned compare. */ + ldi -4096, %r1 + comclr,>>= %r1, %ret0, %r0 /* Note: unsigned compare. */ b,n .LerrorRest - comib,=,n 0,%ret0,thread_start + /* Restore the PIC register. */ +#ifdef __PIC__ + copy %r4, %r19 /* parent */ +#endif + + comib,=,n 0, %ret0, .LthreadStart /* Successful return from the parent - No need to restore the PIC register, + No need to restore the PIC register, since we return immediately. */ + ldw -84(%sp), %rp bv %r0(%rp) - ldwm -64(%sp), %r3 + ldwm -64(%sp), %r4 .LerrorRest: - /* Restore the PIC register on error */ -#ifdef __PIC__ - copy %r3, %r19 /* parent */ -#endif - /* Something bad happened -- no child created */ -.Lerror: - - /* Set errno, save ret0 so we return with that value. */ - copy %ret0, %r3 - b __syscall_error - sub %r0,%ret0,%arg0 - copy %r3, %ret0 - /* Return after setting errno, and restoring ret0 */ + bl __syscall_error, %rp + sub %r0, %ret0, %arg0 + ldw -84(%sp), %rp + /* Return after setting errno, ret0 is set to -1 by __syscall_error. */ bv %r0(%rp) - ldwm -64(%sp), %r3 + ldwm -64(%sp), %r4 -thread_start: +.LerrorSanity: + /* Sanity checks failed, return -1, and set errno to EINVAL. */ + bl __syscall_error, %rp + ldi EINVAL, %arg0 + ldw -84(%sp), %rp + bv %r0(%rp) + ldwm -64(%sp), %r4 +.LthreadStart: /* Load up the arguments. */ - ldw -60(%sr0, %sp),%arg0 - ldw -64(%sr0, %sp),%r22 + ldw -60(%sp), %arg0 + ldw -64(%sp), %r22 - /* $$dyncall fixes childs PIC register */ + /* $$dyncall fixes child's PIC register */ /* Call the user's function */ - bl $$dyncall,%r31 - copy %r31,%rp - - bl HIDDEN_JUMPTARGET(_exit),%rp - copy %ret0,%arg0 +#ifdef __PIC__ + copy %r19, %r4 +#endif + bl $$dyncall, %r31 + copy %r31, %rp +#ifdef __PIC__ + copy %r4, %r19 +#endif + copy %r28, %r26 + ble 0x100(%sr2, %r0) + ldi __NR_exit, %r20 - /* Die horribly. */ - iitlbp %r0,(%sr0,%r0) + /* We should not return from exit. + We do not restore r4, or the stack state. */ + iitlbp %r0, (%sr0, %r0) -.size clone,.-clone +PSEUDO_END(__clone) +libc_hidden_def (__clone) weak_alias (__clone, clone) 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 */ diff --git a/libc/sysdeps/linux/hppa/vfork.S b/libc/sysdeps/linux/hppa/vfork.S new file mode 100644 index 000000000..9d0706361 --- /dev/null +++ b/libc/sysdeps/linux/hppa/vfork.S @@ -0,0 +1,82 @@ +/* Copyright (C) 2005-2018 Free Software Foundation, Inc. + + 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/>. */ + +#include <sysdep.h> +#define _ERRNO_H 1 +#include <bits/errno.h> + +/* Clone the calling process, but without copying the whole address space. + The calling process is suspended until the new process exits or is + replaced by a call to `execve'. Return -1 for errors, 0 to the new process, + and the process ID of the new process to the old process. */ + +.Lthread_start: ASM_LINE_SEP + + /* r26, r25, r24, r23 are free since vfork has no arguments */ +ENTRY(__vfork) + /* We must not create a frame. When the child unwinds to call + exec it will clobber the same frame that the parent + needs to unwind. */ + + /* Save the PIC register. */ +#ifdef __PIC__ + copy %r19, %r25 /* parent */ +#endif + + /* Syscall saves and restores all register states */ + ble 0x100(%sr2,%r0) + ldi __NR_vfork,%r20 + + /* Check for error */ + ldi -4096,%r1 + comclr,>>= %r1,%ret0,%r0 /* Note: unsigned compare. */ + b,n .Lerror + + /* Return, and DO NOT restore rp. The child may have called + functions that updated the frame's rp. This works because + the kernel ensures rp is preserved across the vfork + syscall. */ + bv,n %r0(%rp) + +.Lerror: + /* Now we need a stack to call a function. We are assured + that there is no child now, so it's safe to create + a frame. */ + stw %rp, -20(%sp) + .cfi_offset 2, -20 + stwm %r3, 64(%sp) + .cfi_def_cfa_offset -64 + .cfi_offset 3, 0 + stw %sp, -4(%sp) + + sub %r0,%ret0,%r3 + SYSCALL_ERROR_HANDLER + /* Restore the PIC register (in delay slot) on error */ +#ifdef __PIC__ + copy %r25, %r19 /* parent */ +#else + nop +#endif + /* Write syscall return into errno location */ + stw %r3, 0(%ret0) + ldw -84(%sp), %rp + bv %r0(%rp) + ldwm -64(%sp), %r3 + +PSEUDO_END (__vfork) +libc_hidden_def(vfork) + +weak_alias (__vfork, vfork) |