linux/arch/sparc/kernel/ptrace_32.c
Sergey Shtylyov 37f653033a sparc: ptrace: user_regset_copyin_ignore() always returns 0
user_regset_copyin_ignore() always returns 0, so checking its result seems
pointless -- don't do this anymore...

Link: https://lkml.kernel.org/r/20221014212235.10770-13-s.shtylyov@omp.ru
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Cc: Brian Cain <bcain@quicinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.osdn.me>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-11-15 14:30:41 -08:00

449 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0
/* ptrace.c: Sparc process tracing support.
*
* Copyright (C) 1996, 2008 David S. Miller (davem@davemloft.net)
*
* Based upon code written by Ross Biro, Linus Torvalds, Bob Manson,
* and David Mosberger.
*
* Added Linux support -miguel (weird, eh?, the original code was meant
* to emulate SunOS).
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/smp.h>
#include <linux/security.h>
#include <linux/signal.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/uaccess.h>
#include <asm/cacheflush.h>
#include "kernel.h"
/* #define ALLOW_INIT_TRACING */
/*
* Called by kernel/ptrace.c when detaching..
*
* Make sure single step bits etc are not set.
*/
void ptrace_disable(struct task_struct *child)
{
/* nothing to do */
}
enum sparc_regset {
REGSET_GENERAL,
REGSET_FP,
};
static int regwindow32_get(struct task_struct *target,
const struct pt_regs *regs,
u32 *uregs)
{
unsigned long reg_window = regs->u_regs[UREG_I6];
int size = 16 * sizeof(u32);
if (target == current) {
if (copy_from_user(uregs, (void __user *)reg_window, size))
return -EFAULT;
} else {
if (access_process_vm(target, reg_window, uregs, size,
FOLL_FORCE) != size)
return -EFAULT;
}
return 0;
}
static int regwindow32_set(struct task_struct *target,
const struct pt_regs *regs,
u32 *uregs)
{
unsigned long reg_window = regs->u_regs[UREG_I6];
int size = 16 * sizeof(u32);
if (target == current) {
if (copy_to_user((void __user *)reg_window, uregs, size))
return -EFAULT;
} else {
if (access_process_vm(target, reg_window, uregs, size,
FOLL_FORCE | FOLL_WRITE) != size)
return -EFAULT;
}
return 0;
}
static int genregs32_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
const struct pt_regs *regs = target->thread.kregs;
u32 uregs[16];
if (target == current)
flush_user_windows();
membuf_write(&to, regs->u_regs, 16 * sizeof(u32));
if (!to.left)
return 0;
if (regwindow32_get(target, regs, uregs))
return -EFAULT;
membuf_write(&to, uregs, 16 * sizeof(u32));
membuf_store(&to, regs->psr);
membuf_store(&to, regs->pc);
membuf_store(&to, regs->npc);
membuf_store(&to, regs->y);
return membuf_zero(&to, 2 * sizeof(u32));
}
static int genregs32_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = target->thread.kregs;
u32 uregs[16];
u32 psr;
int ret;
if (target == current)
flush_user_windows();
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs->u_regs,
0, 16 * sizeof(u32));
if (ret || !count)
return ret;
if (regwindow32_get(target, regs, uregs))
return -EFAULT;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
uregs,
16 * sizeof(u32), 32 * sizeof(u32));
if (ret)
return ret;
if (regwindow32_set(target, regs, uregs))
return -EFAULT;
if (!count)
return 0;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&psr,
32 * sizeof(u32), 33 * sizeof(u32));
if (ret)
return ret;
regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
(psr & (PSR_ICC | PSR_SYSCALL));
if (!count)
return 0;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->pc,
33 * sizeof(u32), 34 * sizeof(u32));
if (ret || !count)
return ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->npc,
34 * sizeof(u32), 35 * sizeof(u32));
if (ret || !count)
return ret;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&regs->y,
35 * sizeof(u32), 36 * sizeof(u32));
if (ret || !count)
return ret;
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, 36 * sizeof(u32),
38 * sizeof(u32));
return 0;
}
static int fpregs32_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
#if 0
if (target == current)
save_and_clear_fpu();
#endif
membuf_write(&to, target->thread.float_regs, 32 * sizeof(u32));
membuf_zero(&to, sizeof(u32));
membuf_write(&to, &target->thread.fsr, sizeof(u32));
membuf_store(&to, (u32)((1 << 8) | (8 << 16)));
return membuf_zero(&to, 64 * sizeof(u32));
}
static int fpregs32_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
unsigned long *fpregs = target->thread.float_regs;
int ret;
#if 0
if (target == current)
save_and_clear_fpu();
#endif
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
fpregs,
0, 32 * sizeof(u32));
if (!ret)
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
32 * sizeof(u32),
33 * sizeof(u32));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fsr,
33 * sizeof(u32),
34 * sizeof(u32));
if (!ret)
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
34 * sizeof(u32), -1);
return ret;
}
static const struct user_regset sparc32_regsets[] = {
/* Format is:
* G0 --> G7
* O0 --> O7
* L0 --> L7
* I0 --> I7
* PSR, PC, nPC, Y, WIM, TBR
*/
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS,
.n = 38,
.size = sizeof(u32), .align = sizeof(u32),
.regset_get = genregs32_get, .set = genregs32_set
},
/* Format is:
* F0 --> F31
* empty 32-bit word
* FSR (32--bit word)
* FPU QUEUE COUNT (8-bit char)
* FPU QUEUE ENTRYSIZE (8-bit char)
* FPU ENABLED (8-bit char)
* empty 8-bit char
* FPU QUEUE (64 32-bit ints)
*/
[REGSET_FP] = {
.core_note_type = NT_PRFPREG,
.n = 99,
.size = sizeof(u32), .align = sizeof(u32),
.regset_get = fpregs32_get, .set = fpregs32_set
},
};
static int getregs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
const struct pt_regs *regs = target->thread.kregs;
if (target == current)
flush_user_windows();
membuf_store(&to, regs->psr);
membuf_store(&to, regs->pc);
membuf_store(&to, regs->npc);
membuf_store(&to, regs->y);
return membuf_write(&to, regs->u_regs + 1, 15 * sizeof(u32));
}
static int setregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
struct pt_regs *regs = target->thread.kregs;
u32 v[4];
int ret;
if (target == current)
flush_user_windows();
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
v,
0, 4 * sizeof(u32));
if (ret)
return ret;
regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
(v[0] & (PSR_ICC | PSR_SYSCALL));
regs->pc = v[1];
regs->npc = v[2];
regs->y = v[3];
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
regs->u_regs + 1,
4 * sizeof(u32) , 19 * sizeof(u32));
}
static int getfpregs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
#if 0
if (target == current)
save_and_clear_fpu();
#endif
membuf_write(&to, &target->thread.float_regs, 32 * sizeof(u32));
membuf_write(&to, &target->thread.fsr, sizeof(u32));
return membuf_zero(&to, 35 * sizeof(u32));
}
static int setfpregs_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
unsigned long *fpregs = target->thread.float_regs;
int ret;
#if 0
if (target == current)
save_and_clear_fpu();
#endif
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
fpregs,
0, 32 * sizeof(u32));
if (ret)
return ret;
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.fsr,
32 * sizeof(u32),
33 * sizeof(u32));
}
static const struct user_regset ptrace32_regsets[] = {
[REGSET_GENERAL] = {
.n = 19, .size = sizeof(u32),
.regset_get = getregs_get, .set = setregs_set,
},
[REGSET_FP] = {
.n = 68, .size = sizeof(u32),
.regset_get = getfpregs_get, .set = setfpregs_set,
},
};
static const struct user_regset_view ptrace32_view = {
.regsets = ptrace32_regsets, .n = ARRAY_SIZE(ptrace32_regsets)
};
static const struct user_regset_view user_sparc32_view = {
.name = "sparc", .e_machine = EM_SPARC,
.regsets = sparc32_regsets, .n = ARRAY_SIZE(sparc32_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &user_sparc32_view;
}
struct fps {
unsigned long regs[32];
unsigned long fsr;
unsigned long flags;
unsigned long extra;
unsigned long fpqd;
struct fq {
unsigned long *insnaddr;
unsigned long insn;
} fpq[16];
};
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
void __user *addr2p;
struct pt_regs __user *pregs;
struct fps __user *fps;
int ret;
addr2p = (void __user *) addr2;
pregs = (struct pt_regs __user *) addr;
fps = (struct fps __user *) addr;
switch(request) {
case PTRACE_GETREGS: {
ret = copy_regset_to_user(child, &ptrace32_view,
REGSET_GENERAL, 0,
19 * sizeof(u32),
pregs);
break;
}
case PTRACE_SETREGS: {
ret = copy_regset_from_user(child, &ptrace32_view,
REGSET_GENERAL, 0,
19 * sizeof(u32),
pregs);
break;
}
case PTRACE_GETFPREGS: {
ret = copy_regset_to_user(child, &ptrace32_view,
REGSET_FP, 0,
68 * sizeof(u32),
fps);
break;
}
case PTRACE_SETFPREGS: {
ret = copy_regset_from_user(child, &ptrace32_view,
REGSET_FP, 0,
33 * sizeof(u32),
fps);
break;
}
case PTRACE_READTEXT:
case PTRACE_READDATA:
ret = ptrace_readdata(child, addr, addr2p, data);
if (ret == data)
ret = 0;
else if (ret >= 0)
ret = -EIO;
break;
case PTRACE_WRITETEXT:
case PTRACE_WRITEDATA:
ret = ptrace_writedata(child, addr2p, addr, data);
if (ret == data)
ret = 0;
else if (ret >= 0)
ret = -EIO;
break;
default:
if (request == PTRACE_SPARC_DETACH)
request = PTRACE_DETACH;
ret = ptrace_request(child, request, addr, data);
break;
}
return ret;
}
asmlinkage int syscall_trace(struct pt_regs *regs, int syscall_exit_p)
{
int ret = 0;
if (test_thread_flag(TIF_SYSCALL_TRACE)) {
if (syscall_exit_p)
ptrace_report_syscall_exit(regs, 0);
else
ret = ptrace_report_syscall_entry(regs);
}
return ret;
}