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https://github.com/tobast/libunwind-eh_elf.git
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(unw_resume): Rewrite to make it work for resuming execution past a signal frame
(and also simplify it). (Logical change 1.45)
This commit is contained in:
mostang.com!davidm
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f5892c26be
commit
678d3209fb
1 changed files with 88 additions and 76 deletions
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@ -34,78 +34,57 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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HIDDEN inline int
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ia64_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
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{
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unw_word_t val, sol, sof, pri_unat, loadrs, n, bspstore, pfs;
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struct cursor *c = (struct cursor *) cursor;
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long do_sigreturn = 0;
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unw_fpreg_t fpval;
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ucontext_t *uc = arg;
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unw_word_t val, sol;
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int i, ret;
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# define SET_NAT(n) \
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struct
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{
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unw_word_t r1;
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unw_word_t r4;
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unw_word_t r5;
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unw_word_t r6;
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unw_word_t r7;
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unw_word_t r15;
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unw_word_t r16;
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unw_word_t r17;
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unw_word_t r18;
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}
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extra;
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int ret;
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# define GET_NAT(n) \
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do \
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{ \
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ret = ia64_access_reg (c, UNW_IA64_NAT + (n), &val, 0); \
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if (ret < 0) \
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return ret; \
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if (val) \
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uc->uc_mcontext.sc_nat |= (unw_word_t) 1 << n; \
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pri_unat |= (unw_word_t) 1 << n; \
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} \
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while (0)
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# define SET_REG(f, r) \
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do \
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{ \
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ret = ia64_get (c, c->r, &val); \
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if (ret < 0) \
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return ret; \
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uc->uc_mcontext.f = val; \
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} \
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while (0)
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# define SET_FPREG(f, r) \
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do \
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{ \
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ret = ia64_getfp (c, c->r, &fpval); \
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if (ret < 0) \
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return ret; \
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uc->uc_mcontext.f.u.bits[0] = fpval.raw.bits[0]; \
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uc->uc_mcontext.f.u.bits[1] = fpval.raw.bits[1]; \
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} \
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while (0)
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/* ensure c->pi is up-to-date: */
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if ((ret = ia64_make_proc_info (c)) < 0)
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return ret;
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SET_REG (sc_ar_pfs, pfs_loc);
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SET_REG (sc_br[0], ip_loc);
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SET_REG (sc_pr, pr_loc);
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SET_REG (sc_ar_rnat, rnat_loc);
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SET_REG (sc_ar_lc, lc_loc);
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SET_REG (sc_ar_fpsr, fpsr_loc);
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/* Copy contents of r4-r7 into "extra", so that their values end up
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contiguous, so we can use a single (primary-) UNaT value. */
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if ((ret = ia64_get (c, c->r4_loc, &extra.r4)) < 0
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|| (ret = ia64_get (c, c->r5_loc, &extra.r5)) < 0
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|| (ret = ia64_get (c, c->r6_loc, &extra.r6)) < 0
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|| (ret = ia64_get (c, c->r7_loc, &extra.r7)) < 0)
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return ret;
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SET_REG (sc_gr[4], r4_loc); SET_REG(sc_gr[5], r5_loc);
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SET_REG (sc_gr[6], r6_loc); SET_REG(sc_gr[7], r7_loc);
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uc->uc_mcontext.sc_nat = 0;
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SET_NAT (4); SET_NAT(5);
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SET_NAT (6); SET_NAT(7);
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SET_REG (sc_br[1], b1_loc);
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SET_REG (sc_br[2], b2_loc);
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SET_REG (sc_br[3], b3_loc);
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SET_REG (sc_br[4], b4_loc);
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SET_REG (sc_br[5], b5_loc);
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SET_FPREG (sc_fr[2], f2_loc);
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SET_FPREG (sc_fr[3], f3_loc);
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SET_FPREG (sc_fr[4], f4_loc);
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SET_FPREG (sc_fr[5], f5_loc);
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for (i = 16; i < 32; ++i)
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SET_FPREG (sc_fr[i], fr_loc[i - 16]);
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uc->uc_mcontext.sc_flags = 0;
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uc->uc_mcontext.sc_gr[1] = c->pi.gp;
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uc->uc_mcontext.sc_gr[12] = c->psp;
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/* Form the primary UNaT value: */
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pri_unat = 0;
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GET_NAT (4); GET_NAT(5);
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GET_NAT (6); GET_NAT(7);
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n = (((uintptr_t) &extra.r4) / 8 - 4) % 64;
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pri_unat = (pri_unat << n) | (pri_unat >> (64 - n));
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if (unlikely (c->sigcontext_loc))
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{
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struct sigcontext *sc = (struct sigcontext *) c->sigcontext_loc;
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# define PR_SCRATCH 0xffc0 /* p6-p15 are scratch */
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# define PR_PRESERVED (~(PR_SCRATCH | 1))
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/* We're returning to a frame that was (either directly or
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indirectly) interrupted by a signal. We have to restore
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@ -118,37 +97,64 @@ ia64_local_resume (unw_addr_space_t as, unw_cursor_t *cursor, void *arg)
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was indirectly interrupted by a signal. However, that is not
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safe because that frame and its descendants could have been
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using a special convention that stores "preserved" state in
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scratch registers. The fsyscall convention does this with
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r11 (to save ar.pfs) and b6 (to save "rp"), for example. */
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sc->sc_ip = uc->uc_mcontext.sc_br[0];
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sc->sc_gr[12] = c->psp;
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uc->uc_mcontext.sc_gr[12] = (c->sigcontext_loc - c->sigcontext_off);
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do_sigreturn = 1;
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scratch registers. For example, the Linux fsyscall
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convention does this with r11 (to save ar.pfs) and b6 (to
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save "rp"). */
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/* Account for the fact that sigreturn will decrement bsp by
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size-of-frame. */
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#if 0
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sof = (uc->uc_mcontext.sc_ar_pfs >> 0) & 0x7f;
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uc->uc_mcontext.sc_ar_bsp = ia64_rse_skip_regs (c->bsp, sof);
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#else
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uc->uc_mcontext.sc_ar_bsp = sc->sc_ar_bsp;
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#endif
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printf("uc->bsp=%p, sc->bsp=%p\n", uc->uc_mcontext.sc_ar_bsp, sc->sc_ar_bsp);
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sc->sc_gr[12] = c->psp;
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c->psp = (c->sigcontext_loc - c->sigcontext_off);
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sof = (c->cfm & 0x7f);
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bspstore = c->bsp;
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c->bsp = ia64_rse_skip_regs (bspstore, sof);
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loadrs = 0;
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sc->sc_ip = c->ip;
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sc->sc_cfm = c->cfm & (((unw_word_t) 1 << 38) - 1);
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sc->sc_pr = (c->pr & ~PR_SCRATCH) | (sc->sc_pr & ~PR_PRESERVED);
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if ((ret = ia64_get (c, c->pfs_loc, &sc->sc_ar_pfs)) < 0
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|| (ret = ia64_get (c, c->fpsr_loc, &sc->sc_ar_fpsr)) < 0
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|| (ret = ia64_get (c, c->unat_loc, &sc->sc_ar_unat)) < 0)
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return ret;
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sc->sc_gr[1] = c->pi.gp;
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if (c->eh_valid_mask & 0x1) sc->sc_gr[15] = c->eh_args[0];
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if (c->eh_valid_mask & 0x2) sc->sc_gr[16] = c->eh_args[1];
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if (c->eh_valid_mask & 0x4) sc->sc_gr[17] = c->eh_args[2];
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if (c->eh_valid_mask & 0x8) sc->sc_gr[18] = c->eh_args[3];
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}
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else
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{
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/* Account for the fact that __ia64_install_context() returns
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via br.ret, which will decrement bsp by size-of-locals. */
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sol = (uc->uc_mcontext.sc_ar_pfs >> 7) & 0x7f;
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printf("this needs fixing\n");
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uc->uc_mcontext.sc_ar_bsp = ia64_rse_skip_regs (c->bsp, sol);
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/* Account for the fact that _Uia64_install_context() will
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return via br.ret, which will decrement bsp by size-of-locals. */
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if ((ret = ia64_get (c, c->pfs_loc, &pfs)) < 0)
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return ret;
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sol = (pfs >> 7) & 0x7f;
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c->bsp = ia64_rse_skip_regs (c->bsp, sol);
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loadrs = 0;
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extra.r1 = c->pi.gp;
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extra.r15 = c->eh_args[0];
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extra.r16 = c->eh_args[1];
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extra.r17 = c->eh_args[2];
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extra.r18 = c->eh_args[3];
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}
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__ia64_install_context (uc, c->eh_args[0], c->eh_args[1], c->eh_args[2],
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c->eh_args[3], do_sigreturn);
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_Uia64_install_context (c, pri_unat, (unw_word_t *) &extra, loadrs);
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}
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#endif /* !UNW_REMOTE_ONLY */
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#ifndef UNW_LOCAL_ONLY
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static inline int
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remote_install_cursor (struct cursor *c)
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{
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printf ("%s: XXX implement me!\n", __FUNCTION__);
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return -1;
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}
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#endif
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int
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unw_resume (unw_cursor_t *cursor)
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{
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@ -157,6 +163,12 @@ unw_resume (unw_cursor_t *cursor)
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#ifdef UNW_LOCAL_ONLY
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return ia64_local_resume (c->as, cursor, c->as_arg);
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#else
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return (*c->as->acc.resume) (c->as, cursor, c->as_arg);
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{
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int ret;
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if ((ret = remote_install_cursor (c)) < 0)
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return ret;
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return (*c->as->acc.resume) (c->as, cursor, c->as_arg);
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}
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#endif
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}
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