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Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile

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Pull tile updates from Chris Metcalf:
 "These are a smattering of minor changes from Tilera and other folks,
  mostly in the ptrace area."

* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  arch/tile: set CORE_DUMP_USE_REGSET on tile
  arch/tile: implement arch_ptrace using user_regset on tile
  arch/tile: implement user_regset interface on tile
  arch/tile: clean up tile-specific PTRACE_SETOPTIONS
  arch/tile: provide PT_FLAGS_COMPAT value in pt_regs
  tile/PCI: use for_each_pci_dev to simplify the code
  tilegx: remove __init from pci fixup hook
This commit is contained in:
Linus Torvalds 2012-12-18 15:05:30 -08:00
commit 5b3040a48b
6 changed files with 126 additions and 34 deletions
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2
arch/tile/include/asm/elf.h
View File

@ -170,4 +170,6 @@ do { \
#endif /* CONFIG_COMPAT */
#define CORE_DUMP_USE_REGSET
#endif /* _ASM_TILE_ELF_H */

3
arch/tile/include/asm/ptrace.h
View File

@ -24,8 +24,7 @@ typedef unsigned long pt_reg_t;
#include <uapi/asm/ptrace.h>
#define PTRACE_O_MASK_TILE (PTRACE_O_TRACEMIGRATE)
#define PT_TRACE_MIGRATE 0x00080000
#define PT_TRACE_MASK_TILE (PT_TRACE_MIGRATE)
#define PT_TRACE_MIGRATE PT_EVENT_FLAG(PTRACE_EVENT_MIGRATE)
/* Flag bits in pt_regs.flags */
#define PT_FLAGS_DISABLE_IRQ 1 /* on return to kernel, disable irqs */

8
arch/tile/include/uapi/asm/ptrace.h
View File

@ -81,8 +81,14 @@ struct pt_regs {
#define PTRACE_SETFPREGS 15
/* Support TILE-specific ptrace options, with events starting at 16. */
#define PTRACE_O_TRACEMIGRATE 0x00010000
#define PTRACE_EVENT_MIGRATE 16
#define PTRACE_O_TRACEMIGRATE (1 << PTRACE_EVENT_MIGRATE)
/*
* Flag bits in pt_regs.flags that are part of the ptrace API.
* We start our numbering higher up to avoid confusion with the
* non-ABI kernel-internal values that use the low 16 bits.
*/
#define PT_FLAGS_COMPAT 0x10000 /* process is an -m32 compat process */
#endif /* _UAPI_ASM_TILE_PTRACE_H */

4
arch/tile/kernel/pci.c
View File

@ -245,7 +245,7 @@ static void __devinit fixup_read_and_payload_sizes(void)
u16 new_values;
/* Scan for the smallest maximum payload size. */
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
for_each_pci_dev(dev) {
u32 devcap;
int max_payload;
@ -260,7 +260,7 @@ static void __devinit fixup_read_and_payload_sizes(void)
/* Now, set the max_payload_size for all devices to that value. */
new_values = (max_read_size << 12) | (smallest_max_payload << 5);
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL)
for_each_pci_dev(dev)
pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
PCI_EXP_DEVCTL_PAYLOAD | PCI_EXP_DEVCTL_READRQ,
new_values);

3
arch/tile/kernel/pci_gx.c
View File

@ -1047,8 +1047,7 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
}
/* Called for each device after PCI setup is done. */
static void __init
pcibios_fixup_final(struct pci_dev *pdev)
static void pcibios_fixup_final(struct pci_dev *pdev)
{
set_dma_ops(&pdev->dev, gx_pci_dma_map_ops);
set_dma_offset(&pdev->dev, TILE_PCI_MEM_MAP_BASE_OFFSET);

140
arch/tile/kernel/ptrace.c
View File

@ -19,7 +19,10 @@
#include <linux/kprobes.h>
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/regset.h>
#include <linux/elf.h>
#include <asm/traps.h>
#include <arch/chip.h>
void user_enable_single_step(struct task_struct *child)
{
@ -45,6 +48,100 @@ void ptrace_disable(struct task_struct *child)
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
}
/*
* Get registers from task and ready the result for userspace.
* Note that we localize the API issues to getregs() and putregs() at
* some cost in performance, e.g. we need a full pt_regs copy for
* PEEKUSR, and two copies for POKEUSR. But in general we expect
* GETREGS/PUTREGS to be the API of choice anyway.
*/
static char *getregs(struct task_struct *child, struct pt_regs *uregs)
{
*uregs = *task_pt_regs(child);
/* Set up flags ABI bits. */
uregs->flags = 0;
#ifdef CONFIG_COMPAT
if (task_thread_info(child)->status & TS_COMPAT)
uregs->flags |= PT_FLAGS_COMPAT;
#endif
return (char *)uregs;
}
/* Put registers back to task. */
static void putregs(struct task_struct *child, struct pt_regs *uregs)
{
struct pt_regs *regs = task_pt_regs(child);
/* Don't allow overwriting the kernel-internal flags word. */
uregs->flags = regs->flags;
/* Only allow setting the ICS bit in the ex1 word. */
uregs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(uregs->ex1));
*regs = *uregs;
}
enum tile_regset {
REGSET_GPR,
};
static int tile_gpr_get(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
void *kbuf, void __user *ubuf)
{
struct pt_regs regs;
getregs(target, &regs);
return user_regset_copyout(&pos, &count, &kbuf, &ubuf, &regs, 0,
sizeof(regs));
}
static int tile_gpr_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
int ret;
struct pt_regs regs;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &regs, 0,
sizeof(regs));
if (ret)
return ret;
putregs(target, &regs);
return 0;
}
static const struct user_regset tile_user_regset[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS,
.n = ELF_NGREG,
.size = sizeof(elf_greg_t),
.align = sizeof(elf_greg_t),
.get = tile_gpr_get,
.set = tile_gpr_set,
},
};
static const struct user_regset_view tile_user_regset_view = {
.name = CHIP_ARCH_NAME,
.e_machine = ELF_ARCH,
.ei_osabi = ELF_OSABI,
.regsets = tile_user_regset,
.n = ARRAY_SIZE(tile_user_regset),
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
return &tile_user_regset_view;
}
long arch_ptrace(struct task_struct *child, long request,
unsigned long addr, unsigned long data)
{
@ -53,14 +150,13 @@ long arch_ptrace(struct task_struct *child, long request,
long ret = -EIO;
char *childreg;
struct pt_regs copyregs;
int ex1_offset;
switch (request) {
case PTRACE_PEEKUSR: /* Read register from pt_regs. */
if (addr >= PTREGS_SIZE)
break;
childreg = (char *)task_pt_regs(child) + addr;
childreg = getregs(child, &copyregs) + addr;
#ifdef CONFIG_COMPAT
if (is_compat_task()) {
if (addr & (sizeof(compat_long_t)-1))
@ -79,17 +175,7 @@ long arch_ptrace(struct task_struct *child, long request,
case PTRACE_POKEUSR: /* Write register in pt_regs. */
if (addr >= PTREGS_SIZE)
break;
childreg = (char *)task_pt_regs(child) + addr;
/* Guard against overwrites of the privilege level. */
ex1_offset = PTREGS_OFFSET_EX1;
#if defined(CONFIG_COMPAT) && defined(__BIG_ENDIAN)
if (is_compat_task()) /* point at low word */
ex1_offset += sizeof(compat_long_t);
#endif
if (addr == ex1_offset)
data = PL_ICS_EX1(USER_PL, EX1_ICS(data));
childreg = getregs(child, &copyregs) + addr;
#ifdef CONFIG_COMPAT
if (is_compat_task()) {
if (addr & (sizeof(compat_long_t)-1))
@ -102,24 +188,20 @@ long arch_ptrace(struct task_struct *child, long request,
break;
*(long *)childreg = data;
}
putregs(child, &copyregs);
ret = 0;
break;
case PTRACE_GETREGS: /* Get all registers from the child. */
if (copy_to_user(datap, task_pt_regs(child),
sizeof(struct pt_regs)) == 0) {
ret = 0;
}
ret = copy_regset_to_user(child, &tile_user_regset_view,
REGSET_GPR, 0,
sizeof(struct pt_regs), datap);
break;
case PTRACE_SETREGS: /* Set all registers in the child. */
if (copy_from_user(&copyregs, datap,
sizeof(struct pt_regs)) == 0) {
copyregs.ex1 =
PL_ICS_EX1(USER_PL, EX1_ICS(copyregs.ex1));
*task_pt_regs(child) = copyregs;
ret = 0;
}
ret = copy_regset_from_user(child, &tile_user_regset_view,
REGSET_GPR, 0,
sizeof(struct pt_regs), datap);
break;
case PTRACE_GETFPREGS: /* Get the child FPU state. */
@ -128,12 +210,16 @@ long arch_ptrace(struct task_struct *child, long request,
case PTRACE_SETOPTIONS:
/* Support TILE-specific ptrace options. */
child->ptrace &= ~PT_TRACE_MASK_TILE;
BUILD_BUG_ON(PTRACE_O_MASK_TILE & PTRACE_O_MASK);
tmp = data & PTRACE_O_MASK_TILE;
data &= ~PTRACE_O_MASK_TILE;
ret = ptrace_request(child, request, addr, data);
if (tmp & PTRACE_O_TRACEMIGRATE)
child->ptrace |= PT_TRACE_MIGRATE;
if (ret == 0) {
unsigned int flags = child->ptrace;
flags &= ~(PTRACE_O_MASK_TILE << PT_OPT_FLAG_SHIFT);
flags |= (tmp << PT_OPT_FLAG_SHIFT);
child->ptrace = flags;
}
break;
default: