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Add include of "offsets.h".
(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)
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hp.com!davidm
parent
a9cad72ed4
commit
a04f52279d
1 changed files with 58 additions and 102 deletions
160
src/hppa/Gstep.c
160
src/hppa/Gstep.c
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@ -24,117 +24,73 @@ OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include "unwind_i.h"
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static inline int
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update_frame_state (struct cursor *c)
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{
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#if 0
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unw_word_t prev_ip, prev_sp, prev_bsp, ip, pr, num_regs, cfm;
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int ret;
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prev_ip = c->ip;
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prev_sp = c->sp;
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prev_bsp = c->bsp;
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c->cfm_loc = c->pfs_loc;
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num_regs = 0;
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if (c->is_signal_frame)
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{
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ret = ia64_get (c, c->sp + 0x10 + SIGFRAME_ARG2_OFF, &c->sigcontext_loc);
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Debug (12, "sigcontext_loc=%lx (ret=%d)\n", c->sigcontext_loc, ret);
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if (ret < 0)
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return ret;
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if (c->ip_loc == c->sigcontext_loc + SIGCONTEXT_BR_OFF + 0*8)
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{
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/* Earlier kernels (before 2.4.19 and 2.5.10) had buggy
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unwind info for sigtramp. Fix it up here. */
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c->ip_loc = (c->sigcontext_loc + SIGCONTEXT_IP_OFF);
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c->cfm_loc = (c->sigcontext_loc + SIGCONTEXT_CFM_OFF);
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}
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/* do what can't be described by unwind directives: */
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c->pfs_loc = (c->sigcontext_loc + SIGCONTEXT_AR_PFS_OFF);
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ret = ia64_get (c, c->cfm_loc, &cfm);
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if (ret < 0)
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return ret;
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num_regs = cfm & 0x7f; /* size of frame */
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}
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else
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{
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ret = ia64_get (c, c->cfm_loc, &cfm);
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if (ret < 0)
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return ret;
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num_regs = (cfm >> 7) & 0x7f; /* size of locals */
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}
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c->bsp = ia64_rse_skip_regs (c->bsp, -num_regs);
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/* update the IP cache: */
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ret = ia64_get (c, c->ip_loc, &ip);
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if (ret < 0)
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return ret;
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c->ip = ip;
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if ((ip & 0xc) != 0)
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{
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/* don't let obviously bad addresses pollute the cache */
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Debug (1, "rejecting bad ip=0x%lx\n", (long) c->ip);
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return -UNW_EINVALIDIP;
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}
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if (ip == 0)
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/* end of frame-chain reached */
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return 0;
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pr = c->pr;
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c->sp = c->psp;
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c->is_signal_frame = 0;
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if (c->ip == prev_ip && c->sp == prev_sp && c->bsp == prev_bsp)
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{
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dprintf ("%s: ip, sp, and bsp unchanged; stopping here (ip=0x%lx)\n",
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__FUNCTION__, (long) ip);
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return -UNW_EBADFRAME;
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}
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/* as we unwind, the saved ar.unat becomes the primary unat: */
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c->pri_unat_loc = c->unat_loc;
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/* restore the predicates: */
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ret = ia64_get (c, c->pr_loc, &c->pr);
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if (ret < 0)
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return ret;
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c->pi_valid = 0;
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#endif
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return 0;
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}
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#include "offsets.h"
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PROTECTED int
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unw_step (unw_cursor_t *cursor)
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{
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struct cursor *c = (struct cursor *) cursor;
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int ret;
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int ret, i;
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ret = hppa_get (c, c->sp_loc, &c->sp);
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if (ret < 0)
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return ret;
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Debug (1, "(cursor=%p, ip=0x%08x)\n", c, (unsigned) c->dwarf.ip);
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c->sp_loc = HPPA_LOC (c->sp, 0);
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c->ip_loc = HPPA_LOC (c->sp + 4, 0);
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c->sp += 8;
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/* Try DWARF-based unwinding... */
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ret = dwarf_step (&c->dwarf);
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if (HPPA_GET_LOC (c->sp_loc))
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if (ret < 0 && ret != -UNW_ENOINFO)
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{
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ret = hppa_get (c, c->ip_loc, &c->ip);
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if (ret < 0)
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return ret;
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Debug (2, "returning %d\n", ret);
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return ret;
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}
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else
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c->ip = 0;
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return (c->ip == 0) ? 0 : 1;
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if (unlikely (ret < 0))
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{
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/* DWARF failed, let's see if we can follow the frame-chain
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or skip over the signal trampoline. */
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Debug (13, "dwarf_step() failed (ret=%d), trying fallback\n", ret);
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if (unw_is_signal_frame (cursor))
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{
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#ifdef __linux__
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/* Assume that the trampoline is at the beginning of the
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sigframe. */
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unw_word_t ip, sc_addr = c->dwarf.ip + LINUX_RT_SIGFRAME_UC_OFF;
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dwarf_loc_t iaoq_loc = DWARF_LOC (sc_addr + LINUX_SC_IAOQ_OFF, 0);
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c->sigcontext_format = HPPA_SCF_LINUX_RT_SIGFRAME;
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c->sigcontext_addr = sc_addr;
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c->dwarf.ret_addr_column = UNW_HPPA_RP;
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if ((ret = dwarf_get (&c->dwarf, iaoq_loc, &ip)) , 0)
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{
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Debug (2, "failed to read IAOQ[1] (ret=%d)\n", ret);
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return ret;
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}
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c->dwarf.ip = ip & ~0x3; /* mask out the privilege level */
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for (i = 0; i < 32; ++i)
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{
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c->dwarf.loc[UNW_HPPA_GR + i]
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= DWARF_LOC (sc_addr + LINUX_SC_GR_OFF + 4*i, 0);
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c->dwarf.loc[UNW_HPPA_FR + i]
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= DWARF_LOC (sc_addr + LINUX_SC_FR_OFF + 4*i, 0);
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}
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if ((ret = dwarf_get (&c->dwarf, c->dwarf.loc[UNW_HPPA_SP],
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&c->dwarf.cfa)) < 0)
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{
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Debug (2, "failed to read SP (ret=%d)\n", ret);
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return ret;
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}
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#else
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# error Implement me!
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#endif
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}
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else
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c->dwarf.ip = 0;
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}
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ret = (c->dwarf.ip == 0) ? 0 : 1;
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Debug (2, "returning %d\n", ret);
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return ret;
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}
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