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[PARISC] Arch-specific compat signals

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Add enough arch-specific compat signals code to enable parisc64
to compile and boot out of the mainline tree. There are likely still
many dragons here, but this is a start to squashing the last
big difference between the mainline tree and the parisc-linux tree.
The remaining bugs can be squashed as they come up.

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Kyle McMartin 2006-01-15 14:10:29 -05:00 committed by Kyle McMartin
parent 16541c8745
commit f671c45df2
6 changed files with 232 additions and 14 deletions
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8
arch/parisc/kernel/ptrace.c
View File

@ -91,7 +91,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
int copied;
#ifdef __LP64__
if (is_compat_task(child)) {
if (personality(child->personality) == PER_LINUX32) {
unsigned int tmp;
addr &= 0xffffffffL;
@ -123,7 +123,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
case PTRACE_POKEDATA:
ret = 0;
#ifdef __LP64__
if (is_compat_task(child)) {
if (personality(child->personality) == PER_LINUX32) {
unsigned int tmp = (unsigned int)data;
DBG("sys_ptrace(POKE%s, %d, %lx, %lx)\n",
request == PTRACE_POKETEXT ? "TEXT" : "DATA",
@ -146,7 +146,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
case PTRACE_PEEKUSR: {
ret = -EIO;
#ifdef __LP64__
if (is_compat_task(child)) {
if (personality(child->personality) == PER_LINUX32) {
unsigned int tmp;
if (addr & (sizeof(int)-1))
@ -205,7 +205,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
goto out_tsk;
}
#ifdef __LP64__
if (is_compat_task(child)) {
if (personality(child->personality) == PER_LINUX32) {
if (addr & (sizeof(int)-1))
goto out_tsk;
if ((addr = translate_usr_offset(addr)) < 0)

2
arch/parisc/kernel/signal.c
View File

@ -317,7 +317,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
if(personality(current->personality) == PER_LINUX32) {
DBG(1,"setup_rt_frame: frame->info = 0x%p\n", &compat_frame->info);
err |= compat_copy_siginfo_to_user(&compat_frame->info, info);
err |= copy_siginfo_to_user32(&compat_frame->info, info);
DBG(1,"SETUP_RT_FRAME: 1\n");
compat_val = (compat_int_t)current->sas_ss_sp;
err |= __put_user(compat_val, &compat_frame->uc.uc_stack.ss_sp);

102
arch/parisc/kernel/signal32.c
View File

@ -31,7 +31,6 @@
#include <linux/types.h>
#include <linux/errno.h>
#include <asm/compat_signal.h>
#include <asm/uaccess.h>
#include "signal32.h"
@ -398,3 +397,104 @@ setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __
return err;
}
int
copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
{
unsigned long tmp;
int err;
if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
return -EFAULT;
err = __get_user(to->si_signo, &from->si_signo);
err |= __get_user(to->si_errno, &from->si_errno);
err |= __get_user(to->si_code, &from->si_code);
if (to->si_code < 0)
err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
else {
switch (to->si_code >> 16) {
case __SI_CHLD >> 16:
err |= __get_user(to->si_utime, &from->si_utime);
err |= __get_user(to->si_stime, &from->si_stime);
err |= __get_user(to->si_status, &from->si_status);
default:
err |= __get_user(to->si_pid, &from->si_pid);
err |= __get_user(to->si_uid, &from->si_uid);
break;
case __SI_FAULT >> 16:
err |= __get_user(tmp, &from->si_addr);
to->si_addr = (void __user *) tmp;
break;
case __SI_POLL >> 16:
err |= __get_user(to->si_band, &from->si_band);
err |= __get_user(to->si_fd, &from->si_fd);
break;
case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
case __SI_MESGQ >> 16:
err |= __get_user(to->si_pid, &from->si_pid);
err |= __get_user(to->si_uid, &from->si_uid);
err |= __get_user(to->si_int, &from->si_int);
break;
}
}
return err;
}
int
copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
{
unsigned int addr;
int err;
if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
return -EFAULT;
/* If you change siginfo_t structure, please be sure
this code is fixed accordingly.
It should never copy any pad contained in the structure
to avoid security leaks, but must copy the generic
3 ints plus the relevant union member.
This routine must convert siginfo from 64bit to 32bit as well
at the same time. */
err = __put_user(from->si_signo, &to->si_signo);
err |= __put_user(from->si_errno, &to->si_errno);
err |= __put_user((short)from->si_code, &to->si_code);
if (from->si_code < 0)
err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
else {
switch (from->si_code >> 16) {
case __SI_CHLD >> 16:
err |= __put_user(from->si_utime, &to->si_utime);
err |= __put_user(from->si_stime, &to->si_stime);
err |= __put_user(from->si_status, &to->si_status);
default:
err |= __put_user(from->si_pid, &to->si_pid);
err |= __put_user(from->si_uid, &to->si_uid);
break;
case __SI_FAULT >> 16:
/* avoid type-checking warnings by copying _pad[0] in lieu of si_addr... */
err |= __put_user(from->_sifields._pad[0], &to->si_addr);
break;
case __SI_POLL >> 16:
err |= __put_user(from->si_band, &to->si_band);
err |= __put_user(from->si_fd, &to->si_fd);
break;
case __SI_TIMER >> 16:
err |= __put_user(from->si_tid, &to->si_tid);
err |= __put_user(from->si_overrun, &to->si_overrun);
addr = (unsigned long) from->si_ptr;
err |= __put_user(addr, &to->si_ptr);
break;
case __SI_RT >> 16: /* Not generated by the kernel as of now. */
case __SI_MESGQ >> 16:
err |= __put_user(from->si_uid, &to->si_uid);
err |= __put_user(from->si_pid, &to->si_pid);
addr = (unsigned long) from->si_ptr;
err |= __put_user(addr, &to->si_ptr);
break;
}
}
return err;
}

127
arch/parisc/kernel/signal32.h
View File

@ -20,8 +20,34 @@
#define _PARISC64_KERNEL_SIGNAL32_H
#include <linux/compat.h>
#include <asm/compat_signal.h>
#include <asm/compat_rt_sigframe.h>
typedef compat_uptr_t compat_sighandler_t;
typedef struct compat_sigaltstack {
compat_uptr_t ss_sp;
compat_int_t ss_flags;
compat_size_t ss_size;
} compat_stack_t;
/* Most things should be clean enough to redefine this at will, if care
is taken to make libc match. */
struct compat_sigaction {
compat_sighandler_t sa_handler;
compat_uint_t sa_flags;
compat_sigset_t sa_mask; /* mask last for extensibility */
};
/* 32-bit ucontext as seen from an 64-bit kernel */
struct compat_ucontext {
compat_uint_t uc_flags;
compat_uptr_t uc_link;
compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/
/* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */
compat_uint_t pad[1];
struct compat_sigcontext uc_mcontext;
compat_sigset_t uc_sigmask; /* mask last for extensibility */
};
/* ELF32 signal handling */
@ -29,6 +55,103 @@ struct k_sigaction32 {
struct compat_sigaction sa;
};
typedef struct compat_siginfo {
int si_signo;
int si_errno;
int si_code;
union {
int _pad[((128/sizeof(int)) - 3)];
/* kill() */
struct {
unsigned int _pid; /* sender's pid */
unsigned int _uid; /* sender's uid */
} _kill;
/* POSIX.1b timers */
struct {
compat_timer_t _tid; /* timer id */
int _overrun; /* overrun count */
char _pad[sizeof(unsigned int) - sizeof(int)];
compat_sigval_t _sigval; /* same as below */
int _sys_private; /* not to be passed to user */
} _timer;
/* POSIX.1b signals */
struct {
unsigned int _pid; /* sender's pid */
unsigned int _uid; /* sender's uid */
compat_sigval_t _sigval;
} _rt;
/* SIGCHLD */
struct {
unsigned int _pid; /* which child */
unsigned int _uid; /* sender's uid */
int _status; /* exit code */
compat_clock_t _utime;
compat_clock_t _stime;
} _sigchld;
/* SIGILL, SIGFPE, SIGSEGV, SIGBUS */
struct {
unsigned int _addr; /* faulting insn/memory ref. */
} _sigfault;
/* SIGPOLL */
struct {
int _band; /* POLL_IN, POLL_OUT, POLL_MSG */
int _fd;
} _sigpoll;
} _sifields;
} compat_siginfo_t;
int copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from);
int copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from);
/* In a deft move of uber-hackery, we decide to carry the top half of all
* 64-bit registers in a non-portable, non-ABI, hidden structure.
* Userspace can read the hidden structure if it *wants* but is never
* guaranteed to be in the same place. Infact the uc_sigmask from the
* ucontext_t structure may push the hidden register file downards
*/
struct compat_regfile {
/* Upper half of all the 64-bit registers that were truncated
on a copy to a 32-bit userspace */
compat_int_t rf_gr[32];
compat_int_t rf_iasq[2];
compat_int_t rf_iaoq[2];
compat_int_t rf_sar;
};
#define COMPAT_SIGRETURN_TRAMP 4
#define COMPAT_SIGRESTARTBLOCK_TRAMP 5
#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
COMPAT_SIGRESTARTBLOCK_TRAMP)
struct compat_rt_sigframe {
/* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
Secondary to that it must protect the ERESTART_RESTARTBLOCK
trampoline we left on the stack (we were bad and didn't
change sp so we could run really fast.) */
compat_uint_t tramp[COMPAT_TRAMP_SIZE];
compat_siginfo_t info;
struct compat_ucontext uc;
/* Hidden location of truncated registers, *must* be last. */
struct compat_regfile regs;
};
/*
* The 32-bit ABI wants at least 48 bytes for a function call frame:
* 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
* which Linux/parisc uses is sp-20 for the saved return pointer...)
* Then, the stack pointer must be rounded to a cache line (64 bytes).
*/
#define SIGFRAME32 64
#define FUNCTIONCALLFRAME32 48
#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
void sigset_32to64(sigset_t *s64, compat_sigset_t *s32);
void sigset_64to32(compat_sigset_t *s32, sigset_t *s64);
int do_sigaltstack32 (const compat_stack_t __user *uss32,

1
include/asm-parisc/compat_ucontext.h
View File

@ -2,7 +2,6 @@
#define _ASM_PARISC_COMPAT_UCONTEXT_H
#include <linux/compat.h>
#include<asm/compat_signal.h>
/* 32-bit ucontext as seen from an 64-bit kernel */
struct compat_ucontext {

4
include/asm-parisc/rt_sigframe.h
View File

@ -1,10 +1,6 @@
#ifndef _ASM_PARISC_RT_SIGFRAME_H
#define _ASM_PARISC_RT_SIGFRAME_H
#ifdef CONFIG_COMPAT
#include <asm/compat_rt_sigframe.h>
#endif
#define SIGRETURN_TRAMP 4
#define SIGRESTARTBLOCK_TRAMP 5
#define TRAMP_SIZE (SIGRETURN_TRAMP + SIGRESTARTBLOCK_TRAMP)