m2-internship/libunwind-eh_elf
1
0
Fork 0
mirror of https://github.com/tobast/libunwind-eh_elf.git synced 2024-11-22 23:47:39 +01:00
Code Issues Releases Activity

Add include of "offsets.h".

Browse source 
(unw_step): Improve debug output.  Implement signal-frame fall-back
	code.

2004/12/02 00:40:45-08:00 mostang.com!davidm
(update_frame_state): Remove.
(unw_step): Implement it based on DWARF unwinder.

(Logical change 1.290)
This commit is contained in:
hp.com!davidm 2005-05-03 09:13:17 +00:00
parent a9cad72ed4
commit a04f52279d
1 changed files with 58 additions and 102 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

158
src/hppa/Gstep.c
View file

@ -24,117 +24,73 @@ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include "unwind_i.h"
static inline int
update_frame_state (struct cursor *c)
{
#if 0
unw_word_t prev_ip, prev_sp, prev_bsp, ip, pr, num_regs, cfm;
int ret;
prev_ip = c->ip;
prev_sp = c->sp;
prev_bsp = c->bsp;
c->cfm_loc = c->pfs_loc;
num_regs = 0;
if (c->is_signal_frame)
{
ret = ia64_get (c, c->sp + 0x10 + SIGFRAME_ARG2_OFF, &c->sigcontext_loc);
Debug (12, "sigcontext_loc=%lx (ret=%d)\n", c->sigcontext_loc, ret);
if (ret < 0)
return ret;
if (c->ip_loc == c->sigcontext_loc + SIGCONTEXT_BR_OFF + 0*8)
{
/* Earlier kernels (before 2.4.19 and 2.5.10) had buggy
unwind info for sigtramp. Fix it up here. */
c->ip_loc = (c->sigcontext_loc + SIGCONTEXT_IP_OFF);
c->cfm_loc = (c->sigcontext_loc + SIGCONTEXT_CFM_OFF);
}
/* do what can't be described by unwind directives: */
c->pfs_loc = (c->sigcontext_loc + SIGCONTEXT_AR_PFS_OFF);
ret = ia64_get (c, c->cfm_loc, &cfm);
if (ret < 0)
return ret;
num_regs = cfm & 0x7f; /* size of frame */
}
else
{
ret = ia64_get (c, c->cfm_loc, &cfm);
if (ret < 0)
return ret;
num_regs = (cfm >> 7) & 0x7f; /* size of locals */
}
c->bsp = ia64_rse_skip_regs (c->bsp, -num_regs);
/* update the IP cache: */
ret = ia64_get (c, c->ip_loc, &ip);
if (ret < 0)
return ret;
c->ip = ip;
if ((ip & 0xc) != 0)
{
/* don't let obviously bad addresses pollute the cache */
Debug (1, "rejecting bad ip=0x%lx\n", (long) c->ip);
return -UNW_EINVALIDIP;
}
if (ip == 0)
/* end of frame-chain reached */
return 0;
pr = c->pr;
c->sp = c->psp;
c->is_signal_frame = 0;
if (c->ip == prev_ip && c->sp == prev_sp && c->bsp == prev_bsp)
{
dprintf ("%s: ip, sp, and bsp unchanged; stopping here (ip=0x%lx)\n",
__FUNCTION__, (long) ip);
return -UNW_EBADFRAME;
}
/* as we unwind, the saved ar.unat becomes the primary unat: */
c->pri_unat_loc = c->unat_loc;
/* restore the predicates: */
ret = ia64_get (c, c->pr_loc, &c->pr);
if (ret < 0)
return ret;
c->pi_valid = 0;
#endif
return 0;
}
#include "offsets.h"
PROTECTED int
unw_step (unw_cursor_t *cursor)
{
struct cursor *c = (struct cursor *) cursor;
int ret;
int ret, i;
ret = hppa_get (c, c->sp_loc, &c->sp);
if (ret < 0)
return ret;
Debug (1, "(cursor=%p, ip=0x%08x)\n", c, (unsigned) c->dwarf.ip);
c->sp_loc = HPPA_LOC (c->sp, 0);
c->ip_loc = HPPA_LOC (c->sp + 4, 0);
c->sp += 8;
/* Try DWARF-based unwinding... */
ret = dwarf_step (&c->dwarf);
if (HPPA_GET_LOC (c->sp_loc))
if (ret < 0 && ret != -UNW_ENOINFO)
{
ret = hppa_get (c, c->ip_loc, &c->ip);
if (ret < 0)
Debug (2, "returning %d\n", ret);
return ret;
}
if (unlikely (ret < 0))
{
/* DWARF failed, let's see if we can follow the frame-chain
or skip over the signal trampoline. */
Debug (13, "dwarf_step() failed (ret=%d), trying fallback\n", ret);
if (unw_is_signal_frame (cursor))
{
#ifdef __linux__
/* Assume that the trampoline is at the beginning of the
sigframe. */
unw_word_t ip, sc_addr = c->dwarf.ip + LINUX_RT_SIGFRAME_UC_OFF;
dwarf_loc_t iaoq_loc = DWARF_LOC (sc_addr + LINUX_SC_IAOQ_OFF, 0);
c->sigcontext_format = HPPA_SCF_LINUX_RT_SIGFRAME;
c->sigcontext_addr = sc_addr;
c->dwarf.ret_addr_column = UNW_HPPA_RP;
if ((ret = dwarf_get (&c->dwarf, iaoq_loc, &ip)) , 0)
{
Debug (2, "failed to read IAOQ[1] (ret=%d)\n", ret);
return ret;
}
c->dwarf.ip = ip & ~0x3; /* mask out the privilege level */
for (i = 0; i < 32; ++i)
{
c->dwarf.loc[UNW_HPPA_GR + i]
= DWARF_LOC (sc_addr + LINUX_SC_GR_OFF + 4*i, 0);
c->dwarf.loc[UNW_HPPA_FR + i]
= DWARF_LOC (sc_addr + LINUX_SC_FR_OFF + 4*i, 0);
}
if ((ret = dwarf_get (&c->dwarf, c->dwarf.loc[UNW_HPPA_SP],
&c->dwarf.cfa)) < 0)
{
Debug (2, "failed to read SP (ret=%d)\n", ret);
return ret;
}
#else
# error Implement me!
#endif
}
else
c->ip = 0;
return (c->ip == 0) ? 0 : 1;
c->dwarf.ip = 0;
}
ret = (c->dwarf.ip == 0) ? 0 : 1;
Debug (2, "returning %d\n", ret);
return ret;
}