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powerpc/ptrace: Enable support for NT_PPC_CVSX
This patch enables support for TM checkpointed VSX register set ELF core note NT_PPC_CVSX based ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved through adding a register set REGSET_CVSX 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>
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2 changed files with 130 additions and 0 deletions
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@ -92,6 +92,7 @@
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#define ELF_NGREG 48 /* includes nip, msr, lr, etc. */
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#define ELF_NFPREG 33 /* includes fpscr */
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#define ELF_NVMX 34 /* includes all vector registers */
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#define ELF_NVSX 32 /* includes all VSX registers */
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typedef unsigned long elf_greg_t64;
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typedef elf_greg_t64 elf_gregset_t64[ELF_NGREG];
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@ -65,6 +65,7 @@ struct pt_regs_offset {
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#define REG_OFFSET_END {.name = NULL, .offset = 0}
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#define TVSO(f) (offsetof(struct thread_vr_state, f))
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#define TFSO(f) (offsetof(struct thread_fp_state, f))
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static const struct pt_regs_offset regoffset_table[] = {
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GPR_OFFSET_NAME(0),
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@ -1294,6 +1295,123 @@ static int tm_cvmx_set(struct task_struct *target,
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return ret;
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}
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/**
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* tm_cvsx_active - get active number of registers in CVSX
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* @target: The target task.
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* @regset: The user regset structure.
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*
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* This function checks for the active number of available
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* regisers in transaction checkpointed VSX category.
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*/
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static int tm_cvsx_active(struct task_struct *target,
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const struct user_regset *regset)
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{
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if (!cpu_has_feature(CPU_FTR_TM))
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return -ENODEV;
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if (!MSR_TM_ACTIVE(target->thread.regs->msr))
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return 0;
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flush_vsx_to_thread(target);
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return target->thread.used_vsr ? regset->n : 0;
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}
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/**
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* tm_cvsx_get - get CVSX registers
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* @target: The target task.
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* @regset: The user regset structure.
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* @pos: The buffer position.
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* @count: Number of bytes to copy.
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* @kbuf: Kernel buffer to copy from.
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* @ubuf: User buffer to copy into.
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*
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* This function gets in transaction checkpointed VSX registers.
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*
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* When the transaction is active 'fp_state' holds the checkpointed
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* values for the current transaction to fall back on if it aborts
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* in between. This function gets those checkpointed VSX registers.
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* The userspace interface buffer layout is as follows.
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*
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* struct data {
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* u64 vsx[32];
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*};
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*/
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static int tm_cvsx_get(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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void *kbuf, void __user *ubuf)
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{
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u64 buf[32];
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int ret, i;
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if (!cpu_has_feature(CPU_FTR_TM))
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return -ENODEV;
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if (!MSR_TM_ACTIVE(target->thread.regs->msr))
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return -ENODATA;
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/* Flush the state */
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flush_fp_to_thread(target);
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flush_altivec_to_thread(target);
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flush_tmregs_to_thread(target);
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flush_vsx_to_thread(target);
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for (i = 0; i < 32 ; i++)
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buf[i] = target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET];
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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buf, 0, 32 * sizeof(double));
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return ret;
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}
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/**
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* tm_cvsx_set - set CFPR registers
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* @target: The target task.
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* @regset: The user regset structure.
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* @pos: The buffer position.
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* @count: Number of bytes to copy.
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* @kbuf: Kernel buffer to copy into.
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* @ubuf: User buffer to copy from.
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*
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* This function sets in transaction checkpointed VSX registers.
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*
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* When the transaction is active 'fp_state' holds the checkpointed
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* VSX register values for the current transaction to fall back on
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* if it aborts in between. This function sets these checkpointed
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* FPR registers. The userspace interface buffer layout is as follows.
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*
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* struct data {
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* u64 vsx[32];
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*};
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*/
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static int tm_cvsx_set(struct task_struct *target,
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const struct user_regset *regset,
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unsigned int pos, unsigned int count,
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const void *kbuf, const void __user *ubuf)
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{
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u64 buf[32];
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int ret, i;
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if (!cpu_has_feature(CPU_FTR_TM))
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return -ENODEV;
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if (!MSR_TM_ACTIVE(target->thread.regs->msr))
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return -ENODATA;
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/* Flush the state */
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flush_fp_to_thread(target);
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flush_altivec_to_thread(target);
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flush_tmregs_to_thread(target);
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flush_vsx_to_thread(target);
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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buf, 0, 32 * sizeof(double));
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for (i = 0; i < 32 ; i++)
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target->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i];
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return ret;
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}
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#endif
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/*
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@ -1315,6 +1433,7 @@ enum powerpc_regset {
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REGSET_TM_CGPR, /* TM checkpointed GPR registers */
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REGSET_TM_CFPR, /* TM checkpointed FPR registers */
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REGSET_TM_CVMX, /* TM checkpointed VMX registers */
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REGSET_TM_CVSX, /* TM checkpointed VSX registers */
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#endif
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};
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@ -1366,6 +1485,11 @@ static const struct user_regset native_regsets[] = {
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.size = sizeof(vector128), .align = sizeof(vector128),
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.active = tm_cvmx_active, .get = tm_cvmx_get, .set = tm_cvmx_set
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},
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[REGSET_TM_CVSX] = {
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.core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
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.size = sizeof(double), .align = sizeof(double),
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.active = tm_cvsx_active, .get = tm_cvsx_get, .set = tm_cvsx_set
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},
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#endif
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};
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@ -1608,6 +1732,11 @@ static const struct user_regset compat_regsets[] = {
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.size = sizeof(vector128), .align = sizeof(vector128),
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.active = tm_cvmx_active, .get = tm_cvmx_get, .set = tm_cvmx_set
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},
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[REGSET_TM_CVSX] = {
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.core_note_type = NT_PPC_TM_CVSX, .n = ELF_NVSX,
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.size = sizeof(double), .align = sizeof(double),
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.active = tm_cvsx_active, .get = tm_cvsx_get, .set = tm_cvsx_set
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},
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#endif
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};
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