mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
powerpc/ptrace: Enable support for NT_PPC_CVMX
This patch enables support for TM checkpointed VMX register set ELF core note NT_PPC_CVMX based ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved through adding a register set REGSET_CVMX in powerpc corresponding to the ELF core note section added. It implements the get, set and active functions for this new register set added. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Simon Guo <wei.guo.simon@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
parent
19cbcbf75a
commit
8c13f59999
2 changed files with 159 additions and 0 deletions
|
@ -91,6 +91,7 @@
|
|||
|
||||
#define ELF_NGREG 48 /* includes nip, msr, lr, etc. */
|
||||
#define ELF_NFPREG 33 /* includes fpscr */
|
||||
#define ELF_NVMX 34 /* includes all vector registers */
|
||||
|
||||
typedef unsigned long elf_greg_t64;
|
||||
typedef elf_greg_t64 elf_gregset_t64[ELF_NGREG];
|
||||
|
|
|
@ -64,6 +64,8 @@ struct pt_regs_offset {
|
|||
{.name = STR(gpr##num), .offset = offsetof(struct pt_regs, gpr[num])}
|
||||
#define REG_OFFSET_END {.name = NULL, .offset = 0}
|
||||
|
||||
#define TVSO(f) (offsetof(struct thread_vr_state, f))
|
||||
|
||||
static const struct pt_regs_offset regoffset_table[] = {
|
||||
GPR_OFFSET_NAME(0),
|
||||
GPR_OFFSET_NAME(1),
|
||||
|
@ -1147,6 +1149,151 @@ static int tm_cfpr_set(struct task_struct *target,
|
|||
target->thread.fp_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.
|
||||
*/
|
||||
static 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.
|
||||
* @pos: The buffer position.
|
||||
* @count: Number of bytes to copy.
|
||||
* @kbuf: Kernel buffer to copy from.
|
||||
* @ubuf: User buffer to copy into.
|
||||
*
|
||||
* This function gets in transaction checkpointed VMX registers.
|
||||
*
|
||||
* When the transaction is active 'vr_state' and 'vr_save' 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;
|
||||
*};
|
||||
*/
|
||||
static int tm_cvmx_get(struct task_struct *target,
|
||||
const struct user_regset *regset,
|
||||
unsigned int pos, unsigned int count,
|
||||
void *kbuf, 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 the state */
|
||||
flush_fp_to_thread(target);
|
||||
flush_altivec_to_thread(target);
|
||||
flush_tmregs_to_thread(target);
|
||||
|
||||
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
|
||||
&target->thread.vr_state, 0,
|
||||
33 * sizeof(vector128));
|
||||
if (!ret) {
|
||||
/*
|
||||
* Copy out only the low-order word of vrsave.
|
||||
*/
|
||||
union {
|
||||
elf_vrreg_t reg;
|
||||
u32 word;
|
||||
} vrsave;
|
||||
memset(&vrsave, 0, sizeof(vrsave));
|
||||
vrsave.word = target->thread.vrsave;
|
||||
ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &vrsave,
|
||||
33 * sizeof(vector128), -1);
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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 'vr_state' and 'vr_save' 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;
|
||||
*};
|
||||
*/
|
||||
static 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_fp_to_thread(target);
|
||||
flush_altivec_to_thread(target);
|
||||
flush_tmregs_to_thread(target);
|
||||
|
||||
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
|
||||
&target->thread.vr_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.vrsave;
|
||||
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &vrsave,
|
||||
33 * sizeof(vector128), -1);
|
||||
if (!ret)
|
||||
target->thread.vrsave = vrsave.word;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
|
@ -1167,6 +1314,7 @@ enum powerpc_regset {
|
|||
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
||||
REGSET_TM_CGPR, /* TM checkpointed GPR registers */
|
||||
REGSET_TM_CFPR, /* TM checkpointed FPR registers */
|
||||
REGSET_TM_CVMX, /* TM checkpointed VMX registers */
|
||||
#endif
|
||||
};
|
||||
|
||||
|
@ -1213,6 +1361,11 @@ static const struct user_regset native_regsets[] = {
|
|||
.size = sizeof(double), .align = sizeof(double),
|
||||
.active = tm_cfpr_active, .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, .get = tm_cvmx_get, .set = tm_cvmx_set
|
||||
},
|
||||
#endif
|
||||
};
|
||||
|
||||
|
@ -1450,6 +1603,11 @@ static const struct user_regset compat_regsets[] = {
|
|||
.size = sizeof(double), .align = sizeof(double),
|
||||
.active = tm_cfpr_active, .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, .get = tm_cvmx_get, .set = tm_cvmx_set
|
||||
},
|
||||
#endif
|
||||
};
|
||||
|
||||
|
|
Loading…
Reference in a new issue