// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/regset.h>
#include <linux/elf.h>
#include <linux/nospec.h>
#include <linux/pkeys.h>
#include "ptrace-decl.h"
struct pt_regs_offset {
const char *name;
int offset;
};
#define STR(s) #s /* convert to string */
#define REG_OFFSET_NAME(r) {.name = #r, .offset = offsetof(struct pt_regs, r)}
#define GPR_OFFSET_NAME(num) \
{.name = STR(r##num), .offset = offsetof(struct pt_regs, gpr[num])}, \
{.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
#define REG_OFFSET_END {.name = NULL, .offset = 0}
static const struct pt_regs_offset regoffset_table[] = {
GPR_OFFSET_NAME(0),
GPR_OFFSET_NAME(1),
GPR_OFFSET_NAME(2),
GPR_OFFSET_NAME(3),
GPR_OFFSET_NAME(4),
GPR_OFFSET_NAME(5),
GPR_OFFSET_NAME(6),
GPR_OFFSET_NAME(7),
GPR_OFFSET_NAME(8),
GPR_OFFSET_NAME(9),
GPR_OFFSET_NAME(10),
GPR_OFFSET_NAME(11),
GPR_OFFSET_NAME(12),
GPR_OFFSET_NAME(13),
GPR_OFFSET_NAME(14),
GPR_OFFSET_NAME(15),
GPR_OFFSET_NAME(16),
GPR_OFFSET_NAME(17),
GPR_OFFSET_NAME(18),
GPR_OFFSET_NAME(19),
GPR_OFFSET_NAME(20),
GPR_OFFSET_NAME(21),
GPR_OFFSET_NAME(22),
GPR_OFFSET_NAME(23),
GPR_OFFSET_NAME(24),
GPR_OFFSET_NAME(25),
GPR_OFFSET_NAME(26),
GPR_OFFSET_NAME(27),
GPR_OFFSET_NAME(28),
GPR_OFFSET_NAME(29),
GPR_OFFSET_NAME(30),
GPR_OFFSET_NAME(31),
REG_OFFSET_NAME(nip),
REG_OFFSET_NAME(msr),
REG_OFFSET_NAME(ctr),
REG_OFFSET_NAME(link),
REG_OFFSET_NAME(xer),
REG_OFFSET_NAME(ccr),
#ifdef CONFIG_PPC64
REG_OFFSET_NAME(softe),
#else
REG_OFFSET_NAME(mq),
#endif
REG_OFFSET_NAME(trap),
REG_OFFSET_NAME(dar),
REG_OFFSET_NAME(dsisr),
REG_OFFSET_END,
};
/**
* regs_query_register_offset() - query register offset from its name
* @name: the name of a register
*
* regs_query_register_offset() returns the offset of a register in struct
* pt_regs from its name. If the name is invalid, this returns -EINVAL;
*/
int regs_query_register_offset(const char *name)
{
const struct pt_regs_offset *roff;
for (roff = regoffset_table; roff->name != NULL; roff++)
if (!strcmp(roff->name, name))
return roff->offset;
return -EINVAL;
}
/**
* regs_query_register_name() - query register name from its offset
* @offset: the offset of a register in struct pt_regs.
*
* regs_query_register_name() returns the name of a register from its
* offset in struct pt_regs. If the @offset is invalid, this returns NULL;
*/
const char *regs_query_register_name(unsigned int offset)
{
const struct pt_regs_offset *roff;
for (roff = regoffset_table; roff->name != NULL; roff++)
if (roff->offset == offset)
return roff->name;
return NULL;
}
/*
* does not yet catch signals sent when the child dies.
* in exit.c or in signal.c.
*/
static unsigned long get_user_msr(struct task_struct *task)
{
return task->thread.regs->msr | task->thread.fpexc_mode;
}
static __always_inline int set_user_msr(struct task_struct *task, unsigned long msr)
{
unsigned long newmsr = (task->thread.regs->msr & ~MSR_DEBUGCHANGE) |
(msr & MSR_DEBUGCHANGE);
regs_set_return_msr(task->thread.regs, newmsr);
return 0;
}
#ifdef CONFIG_PPC64
static int get_user_dscr(struct task_struct *task, unsigned long *data)
{
*data = task->thread.dscr;
return 0;
}
static int set_user_dscr(struct task_struct *task, unsigned long dscr)
{
task->thread.dscr = dscr;
task->thread.dscr_inherit = 1;
return 0;
}
#else
static int get_user_dscr(struct task_struct *task, unsigned long *data)
{
return -EIO;
}
static int set_user_dscr(struct task_struct *task, unsigned long dscr)
{
return -EIO;
}
#endif
/*
* We prevent mucking around with the reserved area of trap
* which are used internally by the kernel.
*/
static __always_inline int set_user_trap(struct task_struct *task, unsigned long trap)
{
set_trap(task->thread.regs, trap);
return 0;
}
/*
* Get contents of register REGNO in task TASK.
*/
int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data)
{
unsigned int regs_max;
if (task->thread.regs == NULL || !data)
return -EIO;
if (regno == PT_MSR) {
*data = get_user_msr(task);
return 0;
}
if (regno == PT_DSCR)
return get_user_dscr(task, data);
/*
* softe copies paca->irq_soft_mask variable state. Since irq_soft_mask is
* no more used as a flag, lets force usr to always see the softe value as 1
* which means interrupts are not soft disabled.
*/
if (IS_ENABLED(CONFIG_PPC64) && regno == PT_SOFTE) {
*data = 1;
return 0;
}
regs_max = sizeof(struct user_pt_regs) / sizeof(unsigned long);
if (regno < regs_max) {
regno = array_index_nospec(regno, regs_max);
*data = ((unsigned long *)task->thread.regs)[regno];
return 0;
}
return -EIO;
}
/*
* Write contents of register REGNO in task TASK.
*/
int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
{
if (task->thread.regs == NULL)
return -EIO;
if (regno == PT_MSR)
return set_user_msr(task, data);
if (regno == PT_TRAP)
return set_user_trap(task, data);
if (regno == PT_DSCR)
return set_user_dscr(task, data);
if (regno <= PT_MAX_PUT_REG) {
regno = array_index_nospec(regno, PT_MAX_PUT_REG + 1);
((unsigned long *)task->thread.regs)[regno] = data;
return 0;
}
return -EIO;
}
static int gpr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
struct membuf to_msr = membuf_at(&to, offsetof(struct pt_regs, msr));
#ifdef CONFIG_PPC64
struct membuf to_softe = membuf_at(&to, offsetof(struct pt_regs, softe));
#endif
if (target->thread.regs == NULL)
return -EIO;
membuf_write(&to, target->thread.regs, sizeof(struct user_pt_regs));
membuf_store(&to_msr, get_user_msr(target));
#ifdef CONFIG_PPC64
membuf_store(&to_softe, 0x1ul);
#endif
return membuf_zero(&to, ELF_NGREG * sizeof(unsigned long) -
sizeof(struct user_pt_regs));
}
static int gpr_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 reg;
int ret;
if (target->thread.regs == NULL)
return -EIO;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
target->thread.regs,
0, PT_MSR * sizeof(reg));
if (!ret && count > 0) {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®,
PT_MSR * sizeof(reg),
(PT_MSR + 1) * sizeof(reg));
if (!ret)
ret = set_user_msr(target, reg);
}
BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
offsetof(struct pt_regs, msr) + sizeof(long));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.regs->orig_gpr3,
PT_ORIG_R3 * sizeof(reg),
(PT_MAX_PUT_REG + 1) * sizeof(reg));
if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
(PT_MAX_PUT_REG + 1) * sizeof(reg),
PT_TRAP * sizeof(reg));
if (!ret && count > 0) {
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®,
PT_TRAP * sizeof(reg),
(PT_TRAP + 1) * sizeof(reg));
if (!ret)
ret = set_user_trap(target, reg);
}
if (!ret)
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
(PT_TRAP + 1) * sizeof(reg), -1);
return ret;
}
#ifdef CONFIG_PPC64
static int ppr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
if (!target->thread.regs)
return -EINVAL;
return membuf_write(&to, &target->thread.regs->ppr, sizeof(u64));
}
static int ppr_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, const void *kbuf,
const void __user *ubuf)
{
if (!target->thread.regs)
return -EINVAL;
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.regs->ppr, 0, sizeof(u64));
}
static int dscr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
return membuf_write(&to, &target->thread.dscr, sizeof(u64));
}
static int dscr_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, const void *kbuf,
const void __user *ubuf)
{
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.dscr, 0, sizeof(u64));
}
#endif
#ifdef CONFIG_PPC_BOOK3S_64
static int tar_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
return membuf_write(&to, &target->thread.tar, sizeof(u64));
}
static int tar_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, const void *kbuf,
const void __user *ubuf)
{
return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tar, 0, sizeof(u64));
}
static int ebb_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return -ENODEV;
if (target->thread.used_ebb)
return regset->n;
return 0;
}
static int ebb_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
/* Build tests */
BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return -ENODEV;
if (!target->thread.used_ebb)
return -ENODATA;
return membuf_write(&to, &target->thread.ebbrr, 3 * sizeof(unsigned long));
}
static int ebb_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 = 0;
/* Build tests */
BUILD_BUG_ON(TSO(ebbrr) + sizeof(unsigned long) != TSO(ebbhr));
BUILD_BUG_ON(TSO(ebbhr) + sizeof(unsigned long) != TSO(bescr));
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return -ENODEV;
if (target->thread.used_ebb)
return -ENODATA;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ebbrr,
0, sizeof(unsigned long));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.ebbhr, sizeof(unsigned long),
2 * sizeof(unsigned long));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.bescr, 2 * sizeof(unsigned long),
3 * sizeof(unsigned long));
return ret;
}
static int pmu_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return -ENODEV;
return regset->n;
}
static int pmu_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
/* Build tests */
BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return -ENODEV;
return membuf_write(&to, &target->thread.siar, 5 * sizeof(unsigned long));
}
static int pmu_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 = 0;
/* Build tests */
BUILD_BUG_ON(TSO(siar) + sizeof(unsigned long) != TSO(sdar));
BUILD_BUG_ON(TSO(sdar) + sizeof(unsigned long) != TSO(sier));
BUILD_BUG_ON(TSO(sier) + sizeof(unsigned long) != TSO(mmcr2));
BUILD_BUG_ON(TSO(mmcr2) + sizeof(unsigned long) != TSO(mmcr0));
if (!cpu_has_feature(CPU_FTR_ARCH_207S))
return -ENODEV;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.siar,
0, sizeof(unsigned long));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.sdar, sizeof(unsigned long),
2 * sizeof(unsigned long));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.sier, 2 * sizeof(unsigned long),
3 * sizeof(unsigned long));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.mmcr2, 3 * sizeof(unsigned long),
4 * sizeof(unsigned long));
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.mmcr0, 4 * sizeof(unsigned long),
5 * sizeof(unsigned long));
return ret;
}
static int dexcr_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_ARCH_31))
return -ENODEV;
return regset->n;
}
static int dexcr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
if (!cpu_has_feature(CPU_FTR_ARCH_31))
return -ENODEV;
/*
* The DEXCR is currently static across all CPUs, so we don't
* store the target's value anywhere, but the static value
* will also be correct.
*/
membuf_store(&to, (u64)lower_32_bits(DEXCR_INIT));
/*
* Technically the HDEXCR is per-cpu, but a hypervisor can't reasonably
* change it between CPUs of the same guest.
*/
return membuf_store(&to, (u64)lower_32_bits(mfspr(SPRN_HDEXCR_RO)));
}
#ifdef CONFIG_CHECKPOINT_RESTORE
static int hashkeyr_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_ARCH_31))
return -ENODEV;
return regset->n;
}
static int hashkeyr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
if (!cpu_has_feature(CPU_FTR_ARCH_31))
return -ENODEV;
return membuf_store(&to, target->thread.hashkeyr);
}
static int hashkeyr_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, const void *kbuf,
const void __user *ubuf)
{
if (!cpu_has_feature(CPU_FTR_ARCH_31))
return -ENODEV;
return user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.hashkeyr,
0, sizeof(unsigned long));
}
#endif /* CONFIG_CHECKPOINT_RESTORE */
#endif /* CONFIG_PPC_BOOK3S_64 */
#ifdef CONFIG_PPC_MEM_KEYS
static int pkey_active(struct task_struct *target, const struct user_regset *regset)
{
if (!arch_pkeys_enabled())
return -ENODEV;
return regset->n;
}
static int pkey_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
if (!arch_pkeys_enabled())
return -ENODEV;
membuf_store(&to, target->thread.regs->amr);
membuf_store(&to, target->thread.regs->iamr);
return membuf_store(&to, default_uamor);
}
static int pkey_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count, const void *kbuf,
const void __user *ubuf)
{
u64 new_amr;
int ret;
if (!arch_pkeys_enabled())
return -ENODEV;
/* Only the AMR can be set from userspace */
if (pos != 0 || count != sizeof(new_amr))
return -EINVAL;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&new_amr, 0, sizeof(new_amr));
if (ret)
return ret;
/*
* UAMOR determines which bits of the AMR can be set from userspace.
* UAMOR value 0b11 indicates that the AMR value can be modified
* from userspace. If the kernel is using a specific key, we avoid
* userspace modifying the AMR value for that key by masking them
* via UAMOR 0b00.
*
* Pick the AMR values for the keys that kernel is using. This
* will be indicated by the ~default_uamor bits.
*/
target->thread.regs->amr = (new_amr & default_uamor) |
(target->thread.regs->amr & ~default_uamor);
return 0;
}
#endif /* CONFIG_PPC_MEM_KEYS */
static const struct user_regset native_regsets[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
.size = sizeof(long), .align = sizeof(long),
.regset_get = gpr_get, .set = gpr_set
},
[REGSET_FPR] = {
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
.size = sizeof(double), .align = sizeof(double),
.regset_get = fpr_get, .set = fpr_set
},
#ifdef CONFIG_ALTIVEC
[REGSET_VMX] = {
.core_note_type = NT_PPC_VMX, .n = 34,
.size = sizeof(vector128), .align = sizeof(vector128),
.active = vr_active, .regset_get = vr_get, .set = vr_set
},
#endif
#ifdef CONFIG_VSX
[REGSET_VSX] = {
.core_note_type = NT_PPC_VSX, .n = 32,
.size = sizeof(double), .align = sizeof(double),
.active = vsr_active, .regset_get = vsr_get, .set = vsr_set
},
#endif
#ifdef CONFIG_SPE
[REGSET_SPE] = {
.core_note_type = NT_PPC_SPE, .n = 35,
.size = sizeof(u32), .align = sizeof(u32),
.active = evr_active, .regset_get = evr_get, .set = evr_set
},
#endif
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
[REGSET_TM_CGPR] = {
.core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
.size = sizeof(long), .align = sizeof(long),
.active = tm_cgpr_active, .regset_get = tm_cgpr_get, .set = tm_cgpr_set
},
[REGSET_TM_CFPR] = {
.core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
.size = sizeof(double), .align = sizeof(double),
.active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
},
[REGSET_TM_CVMX] = {
.core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
.size = sizeof(vector128), .align = sizeof(vector128),
.active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
},
[REGSET_TM_CVSX] = {
.core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
.size = sizeof(double), .align = sizeof(double),
.active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
},
[REGSET_TM_SPR] = {
.core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
},
[REGSET_TM_CTAR] = {
.core_note_type = NT_PPC_TM_CTAR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
},
[REGSET_TM_CPPR] = {
.core_note_type = NT_PPC_TM_CPPR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
},
[REGSET_TM_CDSCR] = {
.core_note_type = NT_PPC_TM_CDSCR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
},
#endif
#ifdef CONFIG_PPC64
[REGSET_PPR] = {
.core_note_type = NT_PPC_PPR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.regset_get = ppr_get, .set = ppr_set
},
[REGSET_DSCR] = {
.core_note_type = NT_PPC_DSCR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.regset_get = dscr_get, .set = dscr_set
},
#endif
#ifdef CONFIG_PPC_BOOK3S_64
[REGSET_TAR] = {
.core_note_type = NT_PPC_TAR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.regset_get = tar_get, .set = tar_set
},
[REGSET_EBB] = {
.core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
.size = sizeof(u64), .align = sizeof(u64),
.active = ebb_active, .regset_get = ebb_get, .set = ebb_set
},
[REGSET_PMR] = {
.core_note_type = NT_PPC_PMU, .n = ELF_NPMU,
.size = sizeof(u64), .align = sizeof(u64),
.active = pmu_active, .regset_get = pmu_get, .set = pmu_set
},
[REGSET_DEXCR] = {
.core_note_type = NT_PPC_DEXCR, .n = ELF_NDEXCR,
.size = sizeof(u64), .align = sizeof(u64),
.active = dexcr_active, .regset_get = dexcr_get
},
#ifdef CONFIG_CHECKPOINT_RESTORE
[REGSET_HASHKEYR] = {
.core_note_type = NT_PPC_HASHKEYR, .n = ELF_NHASHKEYR,
.size = sizeof(u64), .align = sizeof(u64),
.active = hashkeyr_active, .regset_get = hashkeyr_get, .set = hashkeyr_set
},
#endif
#endif
#ifdef CONFIG_PPC_MEM_KEYS
[REGSET_PKEY] = {
.core_note_type = NT_PPC_PKEY, .n = ELF_NPKEY,
.size = sizeof(u64), .align = sizeof(u64),
.active = pkey_active, .regset_get = pkey_get, .set = pkey_set
},
#endif
};
const struct user_regset_view user_ppc_native_view = {
.name = UTS_MACHINE, .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI,
.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
};
#include <linux/compat.h>
int gpr32_get_common(struct task_struct *target,
const struct user_regset *regset,
struct membuf to, unsigned long *regs)
{
int i;
for (i = 0; i < PT_MSR; i++)
membuf_store(&to, (u32)regs[i]);
membuf_store(&to, (u32)get_user_msr(target));
for (i++ ; i < PT_REGS_COUNT; i++)
membuf_store(&to, (u32)regs[i]);
return membuf_zero(&to, (ELF_NGREG - PT_REGS_COUNT) * sizeof(u32));
}
static int gpr32_set_common_kernel(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, unsigned long *regs)
{
const compat_ulong_t *k = kbuf;
pos /= sizeof(compat_ulong_t);
count /= sizeof(compat_ulong_t);
for (; count > 0 && pos < PT_MSR; --count)
regs[pos++] = *k++;
if (count > 0 && pos == PT_MSR) {
set_user_msr(target, *k++);
++pos;
--count;
}
for (; count > 0 && pos <= PT_MAX_PUT_REG; --count)
regs[pos++] = *k++;
for (; count > 0 && pos < PT_TRAP; --count, ++pos)
++k;
if (count > 0 && pos == PT_TRAP) {
set_user_trap(target, *k++);
++pos;
--count;
}
kbuf = k;
pos *= sizeof(compat_ulong_t);
count *= sizeof(compat_ulong_t);
user_regset_copyin_ignore(&pos, &count, &kbuf, NULL,
(PT_TRAP + 1) * sizeof(compat_ulong_t), -1);
return 0;
}
static int gpr32_set_common_user(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void __user *ubuf, unsigned long *regs)
{
const compat_ulong_t __user *u = ubuf;
const void *kbuf = NULL;
compat_ulong_t reg;
if (!user_read_access_begin(u, count))
return -EFAULT;
pos /= sizeof(reg);
count /= sizeof(reg);
for (; count > 0 && pos < PT_MSR; --count) {
unsafe_get_user(reg, u++, Efault);
regs[pos++] = reg;
}
if (count > 0 && pos == PT_MSR) {
unsafe_get_user(reg, u++, Efault);
set_user_msr(target, reg);
++pos;
--count;
}
for (; count > 0 && pos <= PT_MAX_PUT_REG; --count) {
unsafe_get_user(reg, u++, Efault);
regs[pos++] = reg;
}
for (; count > 0 && pos < PT_TRAP; --count, ++pos)
unsafe_get_user(reg, u++, Efault);
if (count > 0 && pos == PT_TRAP) {
unsafe_get_user(reg, u++, Efault);
set_user_trap(target, reg);
++pos;
--count;
}
user_read_access_end();
ubuf = u;
pos *= sizeof(reg);
count *= sizeof(reg);
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
(PT_TRAP + 1) * sizeof(reg), -1);
return 0;
Efault:
user_read_access_end();
return -EFAULT;
}
int gpr32_set_common(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf,
unsigned long *regs)
{
if (kbuf)
return gpr32_set_common_kernel(target, regset, pos, count, kbuf, regs);
else
return gpr32_set_common_user(target, regset, pos, count, ubuf, regs);
}
static int gpr32_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
{
if (target->thread.regs == NULL)
return -EIO;
return gpr32_get_common(target, regset, to,
&target->thread.regs->gpr[0]);
}
static int gpr32_set(struct task_struct *target,
const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
if (target->thread.regs == NULL)
return -EIO;
return gpr32_set_common(target, regset, pos, count, kbuf, ubuf,
&target->thread.regs->gpr[0]);
}
/*
* These are the regset flavors matching the CONFIG_PPC32 native set.
*/
static const struct user_regset compat_regsets[] = {
[REGSET_GPR] = {
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
.size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
.regset_get = gpr32_get, .set = gpr32_set
},
[REGSET_FPR] = {
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
.size = sizeof(double), .align = sizeof(double),
.regset_get = fpr_get, .set = fpr_set
},
#ifdef CONFIG_ALTIVEC
[REGSET_VMX] = {
.core_note_type = NT_PPC_VMX, .n = 34,
.size = sizeof(vector128), .align = sizeof(vector128),
.active = vr_active, .regset_get = vr_get, .set = vr_set
},
#endif
#ifdef CONFIG_SPE
[REGSET_SPE] = {
.core_note_type = NT_PPC_SPE, .n = 35,
.size = sizeof(u32), .align = sizeof(u32),
.active = evr_active, .regset_get = evr_get, .set = evr_set
},
#endif
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
[REGSET_TM_CGPR] = {
.core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
.size = sizeof(long), .align = sizeof(long),
.active = tm_cgpr_active,
.regset_get = tm_cgpr32_get, .set = tm_cgpr32_set
},
[REGSET_TM_CFPR] = {
.core_note_type = NT_PPC_TM_CFPR, .n = ELF_NFPREG,
.size = sizeof(double), .align = sizeof(double),
.active = tm_cfpr_active, .regset_get = tm_cfpr_get, .set = tm_cfpr_set
},
[REGSET_TM_CVMX] = {
.core_note_type = NT_PPC_TM_CVMX, .n = ELF_NVMX,
.size = sizeof(vector128), .align = sizeof(vector128),
.active = tm_cvmx_active, .regset_get = tm_cvmx_get, .set = tm_cvmx_set
},
[REGSET_TM_CVSX] = {
.core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
.size = sizeof(double), .align = sizeof(double),
.active = tm_cvsx_active, .regset_get = tm_cvsx_get, .set = tm_cvsx_set
},
[REGSET_TM_SPR] = {
.core_note_type = NT_PPC_TM_SPR, .n = ELF_NTMSPRREG,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_spr_active, .regset_get = tm_spr_get, .set = tm_spr_set
},
[REGSET_TM_CTAR] = {
.core_note_type = NT_PPC_TM_CTAR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_tar_active, .regset_get = tm_tar_get, .set = tm_tar_set
},
[REGSET_TM_CPPR] = {
.core_note_type = NT_PPC_TM_CPPR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_ppr_active, .regset_get = tm_ppr_get, .set = tm_ppr_set
},
[REGSET_TM_CDSCR] = {
.core_note_type = NT_PPC_TM_CDSCR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.active = tm_dscr_active, .regset_get = tm_dscr_get, .set = tm_dscr_set
},
#endif
#ifdef CONFIG_PPC64
[REGSET_PPR] = {
.core_note_type = NT_PPC_PPR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.regset_get = ppr_get, .set = ppr_set
},
[REGSET_DSCR] = {
.core_note_type = NT_PPC_DSCR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.regset_get = dscr_get, .set = dscr_set
},
#endif
#ifdef CONFIG_PPC_BOOK3S_64
[REGSET_TAR] = {
.core_note_type = NT_PPC_TAR, .n = 1,
.size = sizeof(u64), .align = sizeof(u64),
.regset_get = tar_get, .set = tar_set
},
[REGSET_EBB] = {
.core_note_type = NT_PPC_EBB, .n = ELF_NEBB,
.size = sizeof(u64), .align = sizeof(u64),
.active = ebb_active, .regset_get = ebb_get, .set = ebb_set
},
#endif
};
static const struct user_regset_view user_ppc_compat_view = {
.name = "ppc", .e_machine = EM_PPC, .ei_osabi = ELF_OSABI,
.regsets = compat_regsets, .n = ARRAY_SIZE(compat_regsets)
};
const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
if (IS_ENABLED(CONFIG_COMPAT) && is_tsk_32bit_task(task))
return &user_ppc_compat_view;
return &user_ppc_native_view;
}