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| author | Paul Mundt <lethal@linux-sh.org> | 2012-04-10 07:00:30 +0200 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2012-04-10 07:00:30 +0200 |
| commit | 10c5e4e137dc97e54cabd62a6109988ff8670faa (patch) | |
| tree | 7c7a87cc5550fbc657d66b51733b1a33c459d35d /arch/sh | |
| parent | sh: kgdb: Individual register get/set support. (diff) | |
| download | linux-10c5e4e137dc97e54cabd62a6109988ff8670faa.tar.xz linux-10c5e4e137dc97e54cabd62a6109988ff8670faa.zip | |
sh: kgdb: Fill out sleeping_thread_to_gdb_regs() state.
Presently we're using a pretty dumbed-down implementation that copies
over register state visible from the thread info, leaving the bulk of the
switch_to state uncopied.
Given that we're also depending on register bank toggling for switch_to
optimization we ought to also explicitly zero out the GP regs that reside
in an alternate bank in order to prevent handing back garbage.
There are a few extra registers that we have state for in switch_to, so
copy those over while we're at it.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
| -rw-r--r-- | arch/sh/kernel/kgdb.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/sh/kernel/kgdb.c b/arch/sh/kernel/kgdb.c index d25b5ed68b24..ba8e76325d12 100644 --- a/arch/sh/kernel/kgdb.c +++ b/arch/sh/kernel/kgdb.c @@ -222,8 +222,31 @@ char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) { + struct pt_regs *thread_regs = task_pt_regs(p); + int reg; + + /* Initialize to zero */ + for (reg = 0; reg < DBG_MAX_REG_NUM; reg++) + gdb_regs[reg] = 0; + + /* + * Copy out GP regs 8 to 14. + * + * switch_to() relies on SR.RB toggling, so regs 0->7 are banked + * and need privileged instructions to get to. The r15 value we + * fetch from the thread info directly. + */ + for (reg = GDB_R8; reg < GDB_R15; reg++) + gdb_regs[reg] = thread_regs->regs[reg]; + gdb_regs[GDB_R15] = p->thread.sp; gdb_regs[GDB_PC] = p->thread.pc; + + /* + * Additional registers we have context for + */ + gdb_regs[GDB_PR] = thread_regs->pr; + gdb_regs[GDB_GBR] = thread_regs->gbr; } int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, |