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Use static storage for the unwind state so that we can still get backtraces

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when the VM system is hosed.
This commit is contained in:
Doug Rabson 2001-11-02 10:04:22 +00:00
parent 8dd72bc887
commit 721d1e2149
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=85865
1 changed files with 22 additions and 4 deletions
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26
sys/ia64/ia64/unwind.c
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@ -78,6 +78,8 @@ struct unwind_fpreg {
};
struct ia64_unwind_state {
LIST_ENTRY(ia64_unwind_state) us_link; /* free list */
/*
* Current register state and location of saved register state
*/
@ -115,6 +117,9 @@ struct ia64_unwind_state {
static int ia64_unwind_initialised;
static struct ia64_unwind_table_list ia64_unwind_tables;
#define MAX_UNWIND_STATES 4
static struct ia64_unwind_state ia64_unwind_state_static[MAX_UNWIND_STATES];
static LIST_HEAD(ia64_unwind_state_list, ia64_unwind_state) ia64_unwind_states;
struct ia64_unwind_table *
ia64_add_unwind_table(u_int64_t *base, u_int64_t *start, u_int64_t *end)
@ -122,7 +127,14 @@ ia64_add_unwind_table(u_int64_t *base, u_int64_t *start, u_int64_t *end)
struct ia64_unwind_table *ut;
if (!ia64_unwind_initialised) {
int i;
LIST_INIT(&ia64_unwind_tables);
LIST_INIT(&ia64_unwind_states);
for (i = 0; i < MAX_UNWIND_STATES; i++) {
LIST_INSERT_HEAD(&ia64_unwind_states,
&ia64_unwind_state_static[i],
us_link);
}
ia64_unwind_initialised = 1;
}
@ -194,9 +206,15 @@ ia64_create_unwind_state(struct trapframe *framep)
if (!ia64_unwind_initialised)
return 0;
us = malloc(sizeof(struct ia64_unwind_state), M_UNWIND, M_NOWAIT);
if (!us)
return 0;
us = LIST_FIRST(&ia64_unwind_states);
if (us) {
LIST_REMOVE(us, us_link);
} else {
us = malloc(sizeof(struct ia64_unwind_state),
M_UNWIND, M_NOWAIT);
if (!us)
return 0;
}
bzero(us, sizeof(*us));
us->us_regs.rs_psp.ur_value = framep->tf_r[FRAME_SP];
@ -232,7 +250,7 @@ ia64_create_unwind_state(struct trapframe *framep)
void
ia64_free_unwind_state(struct ia64_unwind_state *us)
{
free(us, M_UNWIND);
LIST_INSERT_HEAD(&ia64_unwind_states, us, us_link);
}
u_int64_t