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powerpc/ptrace: Enable support for NT_PPC_CGPR
This patch enables support for TM checkpointed GPR register set ELF core note NT_PPC_CGPR based ptrace requests through PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved through adding a register set REGSET_CGPR 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:
Anshuman Khandual
Michael Ellerman
parent
04fcadce0e
commit
25847fb195
@ -181,6 +181,26 @@ static int set_user_msr(struct task_struct *task, unsigned long msr)
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return 0;
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}
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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static unsigned long get_user_ckpt_msr(struct task_struct *task)
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{
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return task->thread.ckpt_regs.msr | task->thread.fpexc_mode;
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}
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static int set_user_ckpt_msr(struct task_struct *task, unsigned long msr)
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{
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task->thread.ckpt_regs.msr &= ~MSR_DEBUGCHANGE;
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task->thread.ckpt_regs.msr |= msr & MSR_DEBUGCHANGE;
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return 0;
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}
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static int set_user_ckpt_trap(struct task_struct *task, unsigned long trap)
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{
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task->thread.ckpt_regs.trap = trap & 0xfff0;
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return 0;
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}
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#endif
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#ifdef CONFIG_PPC64
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static int get_user_dscr(struct task_struct *task, unsigned long *data)
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{
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@ -847,6 +867,172 @@ static int evr_set(struct task_struct *target, const struct user_regset *regset,
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}
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#endif /* CONFIG_SPE */
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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/**
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* tm_cgpr_active - get active number of registers in CGPR
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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 GPR category.
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*/
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static int tm_cgpr_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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return regset->n;
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}
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/**
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* tm_cgpr_get - get CGPR 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 transaction checkpointed GPR registers.
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*
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* When the transaction is active, 'ckpt_regs' holds all the checkpointed
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* GPR register values for the current transaction to fall back on if it
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* aborts in between. This function gets those checkpointed GPR 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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* struct pt_regs ckpt_regs;
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* };
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*/
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static int tm_cgpr_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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int ret;
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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_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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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.ckpt_regs,
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0, offsetof(struct pt_regs, msr));
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if (!ret) {
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unsigned long msr = get_user_ckpt_msr(target);
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, &msr,
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offsetof(struct pt_regs, msr),
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offsetof(struct pt_regs, msr) +
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sizeof(msr));
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}
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BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
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offsetof(struct pt_regs, msr) + sizeof(long));
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if (!ret)
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ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
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&target->thread.ckpt_regs.orig_gpr3,
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offsetof(struct pt_regs, orig_gpr3),
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sizeof(struct pt_regs));
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if (!ret)
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ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
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sizeof(struct pt_regs), -1);
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return ret;
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}
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/*
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* tm_cgpr_set - set the CGPR 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 GPR registers.
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*
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* When the transaction is active, 'ckpt_regs' holds the checkpointed
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* GPR register values for the current transaction to fall back on if it
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* aborts in between. This function sets those checkpointed GPR 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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* struct pt_regs ckpt_regs;
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* };
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*/
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static int tm_cgpr_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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unsigned long reg;
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int ret;
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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_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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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.ckpt_regs,
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0, PT_MSR * sizeof(reg));
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if (!ret && count > 0) {
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®,
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PT_MSR * sizeof(reg),
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(PT_MSR + 1) * sizeof(reg));
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if (!ret)
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ret = set_user_ckpt_msr(target, reg);
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}
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BUILD_BUG_ON(offsetof(struct pt_regs, orig_gpr3) !=
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offsetof(struct pt_regs, msr) + sizeof(long));
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if (!ret)
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
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&target->thread.ckpt_regs.orig_gpr3,
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PT_ORIG_R3 * sizeof(reg),
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(PT_MAX_PUT_REG + 1) * sizeof(reg));
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if (PT_MAX_PUT_REG + 1 < PT_TRAP && !ret)
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ret = user_regset_copyin_ignore(
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&pos, &count, &kbuf, &ubuf,
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(PT_MAX_PUT_REG + 1) * sizeof(reg),
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PT_TRAP * sizeof(reg));
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if (!ret && count > 0) {
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ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, ®,
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PT_TRAP * sizeof(reg),
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(PT_TRAP + 1) * sizeof(reg));
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if (!ret)
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ret = set_user_ckpt_trap(target, reg);
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}
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if (!ret)
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ret = user_regset_copyin_ignore(
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&pos, &count, &kbuf, &ubuf,
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(PT_TRAP + 1) * sizeof(reg), -1);
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return ret;
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}
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#endif
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/*
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* These are our native regset flavors.
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@ -863,6 +1049,9 @@ enum powerpc_regset {
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#ifdef CONFIG_SPE
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REGSET_SPE,
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#endif
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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REGSET_TM_CGPR, /* TM checkpointed GPR registers */
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#endif
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};
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static const struct user_regset native_regsets[] = {
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@ -897,6 +1086,13 @@ static const struct user_regset native_regsets[] = {
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.active = evr_active, .get = evr_get, .set = evr_set
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},
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#endif
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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[REGSET_TM_CGPR] = {
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.core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
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.size = sizeof(long), .align = sizeof(long),
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.active = tm_cgpr_active, .get = tm_cgpr_get, .set = tm_cgpr_set
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},
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#endif
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};
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static const struct user_regset_view user_ppc_native_view = {
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@ -1059,6 +1255,24 @@ static int gpr32_set_common(struct task_struct *target,
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(PT_TRAP + 1) * sizeof(reg), -1);
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}
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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static int tm_cgpr32_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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return gpr32_get_common(target, regset, pos, count, kbuf, ubuf, 1);
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}
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static int tm_cgpr32_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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return gpr32_set_common(target, regset, pos, count, kbuf, ubuf, 1);
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}
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#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
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static int gpr32_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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@ -1103,6 +1317,14 @@ static const struct user_regset compat_regsets[] = {
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.active = evr_active, .get = evr_get, .set = evr_set
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},
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#endif
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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[REGSET_TM_CGPR] = {
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.core_note_type = NT_PPC_TM_CGPR, .n = ELF_NGREG,
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.size = sizeof(long), .align = sizeof(long),
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.active = tm_cgpr_active,
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.get = tm_cgpr32_get, .set = tm_cgpr32_set
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},
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#endif
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};
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static const struct user_regset_view user_ppc_compat_view = {
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