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author | Anshuman Khandual <khandual@linux.vnet.ibm.com> | 2016-07-28 10:57:43 +0800 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-08-01 11:15:23 +1000 |
commit | cf89d4e1b181bda27a5d52f4afd239ea07e84eb0 (patch) | |
tree | 0e3bfda868eb78f5c26d9645a57a53d322f1bedc /arch/powerpc | |
parent | fa439810cc1b3c927ec24ede17d02467e1b143a1 (diff) | |
download | op-kernel-dev-cf89d4e1b181bda27a5d52f4afd239ea07e84eb0.zip op-kernel-dev-cf89d4e1b181bda27a5d52f4afd239ea07e84eb0.tar.gz |
powerpc/ptrace: Enable support for EBB registers
This patch enables support for EBB state registers related
ELF core note NT_PPC_EBB based ptrace requests through
PTRACE_GETREGSET, PTRACE_SETREGSET calls. This is achieved
through adding one new register sets REGSET_EBB in powerpc
corresponding to the ELF core note sections added in this
regard. It also implements the get, set and active functions
for this new register sets 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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r-- | arch/powerpc/include/uapi/asm/elf.h | 1 | ||||
-rw-r--r-- | arch/powerpc/kernel/ptrace.c | 75 |
2 files changed, 76 insertions, 0 deletions
diff --git a/arch/powerpc/include/uapi/asm/elf.h b/arch/powerpc/include/uapi/asm/elf.h index e703c64..8c4d71a 100644 --- a/arch/powerpc/include/uapi/asm/elf.h +++ b/arch/powerpc/include/uapi/asm/elf.h @@ -94,6 +94,7 @@ #define ELF_NVMX 34 /* includes all vector registers */ #define ELF_NVSX 32 /* includes all VSX registers */ #define ELF_NTMSPRREG 3 /* include tfhar, tfiar, texasr */ +#define ELF_NEBB 3 /* includes ebbrr, ebbhr, bescr */ typedef unsigned long elf_greg_t64; typedef elf_greg_t64 elf_gregset_t64[ELF_NGREG]; diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index a1e166a..7942f9c 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -1760,6 +1760,70 @@ static int tar_set(struct task_struct *target, &target->thread.tar, 0, sizeof(u64)); return ret; } + +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, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + /* 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 user_regset_copyout(&pos, &count, &kbuf, &ubuf, + &target->thread.ebbrr, 0, 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; +} #endif /* * These are our native regset flavors. @@ -1792,6 +1856,7 @@ enum powerpc_regset { #endif #ifdef CONFIG_PPC_BOOK3S_64 REGSET_TAR, /* TAR register */ + REGSET_EBB, /* EBB registers */ #endif }; @@ -1887,6 +1952,11 @@ static const struct user_regset native_regsets[] = { .size = sizeof(u64), .align = sizeof(u64), .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, .get = ebb_get, .set = ebb_set + }, #endif }; @@ -2173,6 +2243,11 @@ static const struct user_regset compat_regsets[] = { .size = sizeof(u64), .align = sizeof(u64), .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, .get = ebb_get, .set = ebb_set + }, #endif }; |