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sh: kgdb: Fill out sleeping_thread_to_gdb_regs() state.

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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>
This commit is contained in:
Paul Mundt 2012-04-10 14:00:30 +09:00
parent fd03e81812
commit 10c5e4e137
1 changed files with 23 additions and 0 deletions
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23
arch/sh/kernel/kgdb.c
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@ -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,