diff options
| author | cinap_lenrek <cinap_lenrek@gmx.de> | 2013-08-04 01:52:46 +0200 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@gmx.de> | 2013-08-04 01:52:46 +0200 |
| commit | a269ced358a6c79708a41c42ae1978599fb5634a (patch) | |
| tree | 8cf739f5413f6d433d7384c07b70efdf3d2d3f50 /sys/src/9/kw | |
| parent | 7dee88ec33e281ae3771e95b6dfe35e9f6ce4fd4 (diff) | |
apply richard millers arm debug fixes (from sources)
From richard:
A couple of patches applied yesterday should make debugging on ARM a
bit more reliable. Using db or acid on ARM, you may have noticed that
a program being debugged would sometimes execute through a breakpoint
without stopping, or run away while being single stepped. It turns out,
as often happens, that one symptom had two separate causes. For details:
/n/sources/patch/applied/5db-condcode/readme
/n/sources/patch/applied/arm-bkpt-cond/readme
To take advantage of the patches, rebuild libmach.a, then acid and db.
On machines with a kw kernel (sheevaplug et al), you'll also want to
rebuild /arm/9plug; otherwise breakpoints will stop working at all.
The new 9plug will, however, still work with the old libmach; and
the bcm and teg2 kernels are already compatible with the new libmach.
Diffstat (limited to 'sys/src/9/kw')
| -rw-r--r-- | sys/src/9/kw/trap.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/sys/src/9/kw/trap.c b/sys/src/9/kw/trap.c index f4d2c7756..ebd98db6f 100644 --- a/sys/src/9/kw/trap.c +++ b/sys/src/9/kw/trap.c @@ -214,6 +214,7 @@ intrs(Ureg *ur, int sort) iprint("spurious irq%s interrupt: %8.8lux\n", irq.name, ibits); s = splfhi(); *irq.irq &= ibits; + *irq.irqmask &= ~ibits; splx(s); } } @@ -416,6 +417,9 @@ trap(Ureg *ureg) case PsrMabt: /* prefetch fault */ ldrexvalid = 0; faultarm(ureg, ureg->pc, user, 1); + if(up->nnote == 0 && + (*(u32int*)ureg->pc & ~(0xF<<28)) == 0x01200070) + postnote(up, 1, "sys: breakpoint", NDebug); break; case PsrMabt+1: /* data fault */ ldrexvalid = 0; @@ -479,16 +483,21 @@ trap(Ureg *ureg) break; case PsrMund: /* undefined instruction */ if(user){ - /* look for floating point instructions to interpret */ - x = spllo(); - rv = fpiarm(ureg); - splx(x); - if(rv == 0){ - ldrexvalid = 0; - snprint(buf, sizeof buf, - "undefined instruction: pc %#lux", - ureg->pc); - postnote(up, 1, buf, NDebug); + if(seg(up, ureg->pc, 0) != nil && + (*(u32int*)ureg->pc & ~(0xF<<28)) == 0x01200070) + postnote(up, 1, "sys: breakpoint", NDebug); + else{ + /* look for floating point instructions to interpret */ + x = spllo(); + rv = fpiarm(ureg); + splx(x); + if(rv == 0){ + ldrexvalid = 0; + snprint(buf, sizeof buf, + "undefined instruction: pc %#lux", + ureg->pc); + postnote(up, 1, buf, NDebug); + } } }else{ iprint("undefined instruction: pc %#lux inst %#ux\n", |