// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/regset.h>
#include <asm/switch_to.h>
#include <asm/tm.h>
#include <asm/asm-prototypes.h>
#include "ptrace-decl.h"
void flush_tmregs_to_thread(struct task_struct *tsk)
{
/*
* If task is not current, it will have been flushed already to
* its thread_struct during __switch_to().
*
* A reclaim flushes ALL the state or if not in TM save TM SPRs
* in the appropriate thread structures from live.
*/
if (!cpu_has_feature(CPU_FTR_TM) || tsk != current)
return;
if (MSR_TM_SUSPENDED(mfmsr())) {
tm_reclaim_current(TM_CAUSE_SIGNAL);
} else {
tm_enable();
tm_save_sprs(&tsk->thread);
}
}
static unsigned long get_user_ckpt_msr(struct task_struct *task)
{
return task->thread.ckpt_regs.msr | task->thread.fpexc_mode;
}
static int set_user_ckpt_msr(struct task_struct *task, unsigned long msr)
{
task->thread.ckpt_regs.msr &= ~MSR_DEBUGCHANGE;
task->thread.ckpt_regs.msr |= msr & MSR_DEBUGCHANGE;
return 0;
}
static int set_user_ckpt_trap(struct task_struct *task, unsigned long trap)
{
set_trap(&task->thread.ckpt_regs, trap);
return 0;
}
/**
* tm_cgpr_active - get active number of registers in CGPR
* @target: The target task.
* @regset: The user regset structure.
*
* This function checks for the active number of available
* regisers in transaction checkpointed GPR category.
*/
int tm_cgpr_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return 0;
return regset->n;
}
/**
* tm_cgpr_get - get CGPR registers
* @target: The target task.
* @regset: The user regset structure.
* @to: Destination of copy.
*
* This function gets transaction checkpointed GPR registers.
*
* When the transaction is active, 'ckpt_regs' holds all the checkpointed
* GPR register values for the current transaction to fall back on if it
* aborts in between. This function gets those checkpointed GPR registers.
* The userspace interface buffer layout is as follows.
*
* struct data {
* struct pt_regs ckpt_regs;
* };
*/
int tm_cgpr_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 (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
membuf_write(&to, &target->thread.ckpt_regs, sizeof(struct user_pt_regs));
membuf_store(&to_msr, get_user_ckpt_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));
}
/*
* tm_cgpr_set - set the CGPR registers
* @target: The target task.
* @regset: The user regset structure.
* @pos: The buffer position.
* @count: Number of bytes to copy.
* @kbuf: Kernel buffer to copy into.
* @ubuf: User buffer to copy from.
*
* This function sets in transaction checkpointed GPR registers.
*
* When the transaction is active, 'ckpt_regs' holds the checkpointed
* GPR register values for the current transaction to fall back on if it
* aborts in between. This function sets those checkpointed GPR registers.
* The userspace interface buffer layout is as follows.
*
* struct data {
* struct pt_regs ckpt_regs;
* };
*/
int tm_cgpr_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 (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.ckpt_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_ckpt_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.ckpt_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_ckpt_trap(target, reg);
}
if (!ret)
user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
(PT_TRAP + 1) * sizeof(reg), -1);
return ret;
}
/**
* tm_cfpr_active - get active number of registers in CFPR
* @target: The target task.
* @regset: The user regset structure.
*
* This function checks for the active number of available
* regisers in transaction checkpointed FPR category.
*/
int tm_cfpr_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return 0;
return regset->n;
}
/**
* tm_cfpr_get - get CFPR registers
* @target: The target task.
* @regset: The user regset structure.
* @to: Destination of copy.
*
* This function gets in transaction checkpointed FPR registers.
*
* When the transaction is active 'ckfp_state' holds the checkpointed
* values for the current transaction to fall back on if it aborts
* in between. This function gets those checkpointed FPR registers.
* The userspace interface buffer layout is as follows.
*
* struct data {
* u64 fpr[32];
* u64 fpscr;
*};
*/
int tm_cfpr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
u64 buf[33];
int i;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
/* copy to local buffer then write that out */
for (i = 0; i < 32 ; i++)
buf[i] = target->thread.TS_CKFPR(i);
buf[32] = target->thread.ckfp_state.fpscr;
return membuf_write(&to, buf, sizeof(buf));
}
/**
* tm_cfpr_set - set CFPR registers
* @target: The target task.
* @regset: The user regset structure.
* @pos: The buffer position.
* @count: Number of bytes to copy.
* @kbuf: Kernel buffer to copy into.
* @ubuf: User buffer to copy from.
*
* This function sets in transaction checkpointed FPR registers.
*
* When the transaction is active 'ckfp_state' holds the checkpointed
* FPR register values for the current transaction to fall back on
* if it aborts in between. This function sets these checkpointed
* FPR registers. The userspace interface buffer layout is as follows.
*
* struct data {
* u64 fpr[32];
* u64 fpscr;
*};
*/
int tm_cfpr_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
u64 buf[33];
int i;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
for (i = 0; i < 32; i++)
buf[i] = target->thread.TS_CKFPR(i);
buf[32] = target->thread.ckfp_state.fpscr;
/* copy to local buffer then write that out */
i = user_regset_copyin(&pos, &count, &kbuf, &ubuf, buf, 0, -1);
if (i)
return i;
for (i = 0; i < 32 ; i++)
target->thread.TS_CKFPR(i) = buf[i];
target->thread.ckfp_state.fpscr = buf[32];
return 0;
}
/**
* tm_cvmx_active - get active number of registers in CVMX
* @target: The target task.
* @regset: The user regset structure.
*
* This function checks for the active number of available
* regisers in checkpointed VMX category.
*/
int tm_cvmx_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return 0;
return regset->n;
}
/**
* tm_cvmx_get - get CMVX registers
* @target: The target task.
* @regset: The user regset structure.
* @to: Destination of copy.
*
* This function gets in transaction checkpointed VMX registers.
*
* When the transaction is active 'ckvr_state' and 'ckvrsave' hold
* the checkpointed values for the current transaction to fall
* back on if it aborts in between. The userspace interface buffer
* layout is as follows.
*
* struct data {
* vector128 vr[32];
* vector128 vscr;
* vector128 vrsave;
*};
*/
int tm_cvmx_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
union {
elf_vrreg_t reg;
u32 word;
} vrsave;
BUILD_BUG_ON(TVSO(vscr) != TVSO(vr[32]));
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
/* Flush the state */
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
membuf_write(&to, &target->thread.ckvr_state, 33 * sizeof(vector128));
/*
* Copy out only the low-order word of vrsave.
*/
memset(&vrsave, 0, sizeof(vrsave));
vrsave.word = target->thread.ckvrsave;
return membuf_write(&to, &vrsave, sizeof(vrsave));
}
/**
* tm_cvmx_set - set CMVX registers
* @target: The target task.
* @regset: The user regset structure.
* @pos: The buffer position.
* @count: Number of bytes to copy.
* @kbuf: Kernel buffer to copy into.
* @ubuf: User buffer to copy from.
*
* This function sets in transaction checkpointed VMX registers.
*
* When the transaction is active 'ckvr_state' and 'ckvrsave' hold
* the checkpointed values for the current transaction to fall
* back on if it aborts in between. The userspace interface buffer
* layout is as follows.
*
* struct data {
* vector128 vr[32];
* vector128 vscr;
* vector128 vrsave;
*};
*/
int tm_cvmx_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;
BUILD_BUG_ON(TVSO(vscr) != TVSO(vr[32]));
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &target->thread.ckvr_state,
0, 33 * sizeof(vector128));
if (!ret && count > 0) {
/*
* We use only the low-order word of vrsave.
*/
union {
elf_vrreg_t reg;
u32 word;
} vrsave;
memset(&vrsave, 0, sizeof(vrsave));
vrsave.word = target->thread.ckvrsave;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
33 * sizeof(vector128), -1);
if (!ret)
target->thread.ckvrsave = vrsave.word;
}
return ret;
}
/**
* tm_cvsx_active - get active number of registers in CVSX
* @target: The target task.
* @regset: The user regset structure.
*
* This function checks for the active number of available
* regisers in transaction checkpointed VSX category.
*/
int tm_cvsx_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return 0;
flush_vsx_to_thread(target);
return target->thread.used_vsr ? regset->n : 0;
}
/**
* tm_cvsx_get - get CVSX registers
* @target: The target task.
* @regset: The user regset structure.
* @to: Destination of copy.
*
* This function gets in transaction checkpointed VSX registers.
*
* When the transaction is active 'ckfp_state' holds the checkpointed
* values for the current transaction to fall back on if it aborts
* in between. This function gets those checkpointed VSX registers.
* The userspace interface buffer layout is as follows.
*
* struct data {
* u64 vsx[32];
*};
*/
int tm_cvsx_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
u64 buf[32];
int i;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
/* Flush the state */
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
flush_vsx_to_thread(target);
for (i = 0; i < 32 ; i++)
buf[i] = target->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
return membuf_write(&to, buf, 32 * sizeof(double));
}
/**
* tm_cvsx_set - set CFPR registers
* @target: The target task.
* @regset: The user regset structure.
* @pos: The buffer position.
* @count: Number of bytes to copy.
* @kbuf: Kernel buffer to copy into.
* @ubuf: User buffer to copy from.
*
* This function sets in transaction checkpointed VSX registers.
*
* When the transaction is active 'ckfp_state' holds the checkpointed
* VSX register values for the current transaction to fall back on
* if it aborts in between. This function sets these checkpointed
* FPR registers. The userspace interface buffer layout is as follows.
*
* struct data {
* u64 vsx[32];
*};
*/
int tm_cvsx_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
u64 buf[32];
int ret, i;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
/* Flush the state */
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
flush_vsx_to_thread(target);
for (i = 0; i < 32 ; i++)
buf[i] = target->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET];
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
buf, 0, 32 * sizeof(double));
if (!ret)
for (i = 0; i < 32 ; i++)
target->thread.ckfp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
return ret;
}
/**
* tm_spr_active - get active number of registers in TM SPR
* @target: The target task.
* @regset: The user regset structure.
*
* This function checks the active number of available
* regisers in the transactional memory SPR category.
*/
int tm_spr_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
return regset->n;
}
/**
* tm_spr_get - get the TM related SPR registers
* @target: The target task.
* @regset: The user regset structure.
* @to: Destination of copy.
*
* This function gets transactional memory related SPR registers.
* The userspace interface buffer layout is as follows.
*
* struct {
* u64 tm_tfhar;
* u64 tm_texasr;
* u64 tm_tfiar;
* };
*/
int tm_spr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
/* Build tests */
BUILD_BUG_ON(TSO(tm_tfhar) + sizeof(u64) != TSO(tm_texasr));
BUILD_BUG_ON(TSO(tm_texasr) + sizeof(u64) != TSO(tm_tfiar));
BUILD_BUG_ON(TSO(tm_tfiar) + sizeof(u64) != TSO(ckpt_regs));
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
/* Flush the states */
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
/* TFHAR register */
membuf_write(&to, &target->thread.tm_tfhar, sizeof(u64));
/* TEXASR register */
membuf_write(&to, &target->thread.tm_texasr, sizeof(u64));
/* TFIAR register */
return membuf_write(&to, &target->thread.tm_tfiar, sizeof(u64));
}
/**
* tm_spr_set - set the TM related SPR registers
* @target: The target task.
* @regset: The user regset structure.
* @pos: The buffer position.
* @count: Number of bytes to copy.
* @kbuf: Kernel buffer to copy into.
* @ubuf: User buffer to copy from.
*
* This function sets transactional memory related SPR registers.
* The userspace interface buffer layout is as follows.
*
* struct {
* u64 tm_tfhar;
* u64 tm_texasr;
* u64 tm_tfiar;
* };
*/
int tm_spr_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;
/* Build tests */
BUILD_BUG_ON(TSO(tm_tfhar) + sizeof(u64) != TSO(tm_texasr));
BUILD_BUG_ON(TSO(tm_texasr) + sizeof(u64) != TSO(tm_tfiar));
BUILD_BUG_ON(TSO(tm_tfiar) + sizeof(u64) != TSO(ckpt_regs));
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
/* Flush the states */
flush_tmregs_to_thread(target);
flush_fp_to_thread(target);
flush_altivec_to_thread(target);
/* TFHAR register */
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_tfhar, 0, sizeof(u64));
/* TEXASR register */
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_texasr, sizeof(u64),
2 * sizeof(u64));
/* TFIAR register */
if (!ret)
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_tfiar,
2 * sizeof(u64), 3 * sizeof(u64));
return ret;
}
int tm_tar_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (MSR_TM_ACTIVE(target->thread.regs->msr))
return regset->n;
return 0;
}
int tm_tar_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
return membuf_write(&to, &target->thread.tm_tar, sizeof(u64));
}
int tm_tar_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;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_tar, 0, sizeof(u64));
return ret;
}
int tm_ppr_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (MSR_TM_ACTIVE(target->thread.regs->msr))
return regset->n;
return 0;
}
int tm_ppr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
return membuf_write(&to, &target->thread.tm_ppr, sizeof(u64));
}
int tm_ppr_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;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_ppr, 0, sizeof(u64));
return ret;
}
int tm_dscr_active(struct task_struct *target, const struct user_regset *regset)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (MSR_TM_ACTIVE(target->thread.regs->msr))
return regset->n;
return 0;
}
int tm_dscr_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
return membuf_write(&to, &target->thread.tm_dscr, sizeof(u64));
}
int tm_dscr_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;
if (!cpu_has_feature(CPU_FTR_TM))
return -ENODEV;
if (!MSR_TM_ACTIVE(target->thread.regs->msr))
return -ENODATA;
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
&target->thread.tm_dscr, 0, sizeof(u64));
return ret;
}
int tm_cgpr32_get(struct task_struct *target, const struct user_regset *regset,
struct membuf to)
{
gpr32_get_common(target, regset, to,
&target->thread.ckpt_regs.gpr[0]);
return membuf_zero(&to, ELF_NGREG * sizeof(u32));
}
int tm_cgpr32_set(struct task_struct *target, const struct user_regset *regset,
unsigned int pos, unsigned int count,
const void *kbuf, const void __user *ubuf)
{
return gpr32_set_common(target, regset, pos, count, kbuf, ubuf,
&target->thread.ckpt_regs.gpr[0]);
}
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