diff options
| author | Richard Kuo | 2013-03-07 12:03:10 -0600 |
|---|---|---|
| committer | Richard Kuo | 2013-04-30 19:40:25 -0500 |
| commit | 7777746c40876834c1527689336e43c8381b1921 (patch) | |
| tree | b3257768e29db418ab9292a4e9a27c56e1e88fed /arch | |
| parent | f8722a4d5243e779d6795e2d775c9114c44a6c26 (diff) | |
Hexagon: add support for single-stepping (v4+)
Hardware single-step is only available on v4 and later
architectures.
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/hexagon/include/uapi/asm/ptrace.h | 5 | ||||
| -rw-r--r-- | arch/hexagon/include/uapi/asm/registers.h | 3 | ||||
| -rw-r--r-- | arch/hexagon/kernel/ptrace.c | 15 | ||||
| -rw-r--r-- | arch/hexagon/kernel/traps.c | 11 | ||||
| -rw-r--r-- | arch/hexagon/kernel/vm_entry.S | 3 | ||||
| -rw-r--r-- | arch/hexagon/kernel/vm_vectors.S | 2 |
6 files changed, 38 insertions, 1 deletions
diff --git a/arch/hexagon/include/uapi/asm/ptrace.h b/arch/hexagon/include/uapi/asm/ptrace.h index 1ffce0c6ee07..065e5b32313f 100644 --- a/arch/hexagon/include/uapi/asm/ptrace.h +++ b/arch/hexagon/include/uapi/asm/ptrace.h @@ -36,4 +36,9 @@ extern const char *regs_query_register_name(unsigned int offset); ((struct pt_regs *) \ ((unsigned long)current_thread_info() + THREAD_SIZE) - 1) +#if CONFIG_HEXAGON_ARCH_VERSION >= 4 +#define arch_has_single_step() (1) +#endif + + #endif diff --git a/arch/hexagon/include/uapi/asm/registers.h b/arch/hexagon/include/uapi/asm/registers.h index 80504155ca3a..fcdb5f96a984 100644 --- a/arch/hexagon/include/uapi/asm/registers.h +++ b/arch/hexagon/include/uapi/asm/registers.h @@ -211,6 +211,9 @@ struct pt_regs { #define pt_psp(regs) ((regs)->hvmer.vmpsp) #define pt_badva(regs) ((regs)->hvmer.vmbadva) +#define pt_set_singlestep(regs) ((regs)->hvmer.vmest |= (1<<HVM_VMEST_SS_SFT)) +#define pt_clr_singlestep(regs) ((regs)->hvmer.vmest &= ~(1<<HVM_VMEST_SS_SFT)) + #define pt_set_rte_sp(regs, sp) do {\ pt_psp(regs) = (sp);\ (regs)->SP = (unsigned long) &((regs)->hvmer);\ diff --git a/arch/hexagon/kernel/ptrace.c b/arch/hexagon/kernel/ptrace.c index 3982d9c9ec2b..70df50d797d8 100644 --- a/arch/hexagon/kernel/ptrace.c +++ b/arch/hexagon/kernel/ptrace.c @@ -32,6 +32,21 @@ #include <asm/user.h> +#if arch_has_single_step() +/* Both called from ptrace_resume */ +void user_enable_single_step(struct task_struct *child) +{ + pt_set_singlestep(task_pt_regs(child)); + set_tsk_thread_flag(child, TIF_SINGLESTEP); +} + +void user_disable_single_step(struct task_struct *child) +{ + pt_clr_singlestep(task_pt_regs(child)); + clear_tsk_thread_flag(child, TIF_SINGLESTEP); +} +#endif + static int genregs_get(struct task_struct *target, const struct user_regset *regset, unsigned int pos, unsigned int count, diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c index 12164a30e8ff..c2eeeef55335 100644 --- a/arch/hexagon/kernel/traps.c +++ b/arch/hexagon/kernel/traps.c @@ -451,3 +451,14 @@ void do_machcheck(struct pt_regs *regs) /* Halt and catch fire */ __vmstop(); } + +/* + * Treat this like the old 0xdb trap. + */ + +void do_debug_exception(struct pt_regs *regs) +{ + regs->hvmer.vmest &= ~HVM_VMEST_CAUSE_MSK; + regs->hvmer.vmest |= (TRAP_DEBUG << HVM_VMEST_CAUSE_SFT); + do_trap0(regs); +} diff --git a/arch/hexagon/kernel/vm_entry.S b/arch/hexagon/kernel/vm_entry.S index 053551ee7114..9add73ab57d8 100644 --- a/arch/hexagon/kernel/vm_entry.S +++ b/arch/hexagon/kernel/vm_entry.S @@ -367,6 +367,9 @@ _K_enter_trap0: _K_enter_machcheck: vm_event_entry(do_machcheck) + .globl _K_enter_debug +_K_enter_debug: + vm_event_entry(do_debug_exception) .globl ret_from_fork ret_from_fork: diff --git a/arch/hexagon/kernel/vm_vectors.S b/arch/hexagon/kernel/vm_vectors.S index 620f42cc582a..aff4054a2cff 100644 --- a/arch/hexagon/kernel/vm_vectors.S +++ b/arch/hexagon/kernel/vm_vectors.S @@ -41,7 +41,7 @@ _K_VM_event_vector: jump 1b; /* Reset */ jump _K_enter_machcheck; jump _K_enter_genex; - jump 1b; /* 3 Rsvd */ + jump _K_enter_debug; jump 1b; /* 4 Rsvd */ jump _K_enter_trap0; jump 1b; /* 6 Rsvd */ |