Author: Stefano Rivera <[email protected]>
Branch:
Changeset: r83395:968b2dd3d289
Date: 2016-03-27 13:07 -0400
http://bitbucket.org/pypy/pypy/changeset/968b2dd3d289/
Log: Implement our own getauxval() so we can support glibc < 2.16
diff --git a/rpython/jit/backend/arm/detect.py
b/rpython/jit/backend/arm/detect.py
--- a/rpython/jit/backend/arm/detect.py
+++ b/rpython/jit/backend/arm/detect.py
@@ -1,7 +1,6 @@
import os
from rpython.translator.tool.cbuild import ExternalCompilationInfo
-from rpython.rtyper.lltypesystem import lltype, rffi
from rpython.rtyper.tool import rffi_platform
from rpython.rlib.clibffi import FFI_DEFAULT_ABI, FFI_SYSV, FFI_VFP
from rpython.translator.platform import CompilationError
@@ -16,7 +15,6 @@
asm volatile("VMOV s0, s1");
}
"""])
-getauxval = rffi.llexternal("getauxval", [lltype.Unsigned], lltype.Unsigned)
def detect_hardfloat():
return FFI_DEFAULT_ABI == FFI_VFP
@@ -67,6 +65,43 @@
return n
+# Once we can rely on the availability of glibc >= 2.16, replace this with:
+# from rpython.rtyper.lltypesystem import lltype, rffi
+# getauxval = rffi.llexternal("getauxval", [lltype.Unsigned], lltype.Unsigned)
+def getauxval(type_, filename='/proc/self/auxv'):
+ fd = os.open(filename, os.O_RDONLY, 0644)
+
+ buf_size = 2048
+ struct_size = 8 # 2x uint32
+ try:
+ buf = os.read(fd, buf_size)
+ finally:
+ os.close(fd)
+
+ i = 0
+ while i <= buf_size - struct_size:
+ if buf[i] == 0:
+ i += 1
+ continue
+
+ # We only support little-endian ARM
+ a_type = (ord(buf[i]) |
+ (ord(buf[i+1]) << 8) |
+ (ord(buf[i+2]) << 16) |
+ (ord(buf[i+3]) << 24))
+
+ if a_type != type_:
+ i += struct_size
+
+ a_val = (ord(buf[i+4]) |
+ (ord(buf[i+5]) << 8) |
+ (ord(buf[i+6]) << 16) |
+ (ord(buf[i+7]) << 24))
+ return a_val
+
+ raise KeyError('failed to find auxval type: %i' % type_)
+
+
def detect_neon():
AT_HWCAP = 16
HWCAP_NEON = 1 << 12
diff --git a/rpython/jit/backend/arm/test/test_detect.py
b/rpython/jit/backend/arm/test/test_detect.py
--- a/rpython/jit/backend/arm/test/test_detect.py
+++ b/rpython/jit/backend/arm/test/test_detect.py
@@ -1,6 +1,6 @@
import py
from rpython.tool.udir import udir
-from rpython.jit.backend.arm.detect import detect_arch_version
+from rpython.jit.backend.arm.detect import detect_arch_version, getauxval
cpuinfo = "Processor : ARMv%d-compatible processor rev 7 (v6l)"""
cpuinfo2 = """processor : 0
@@ -29,6 +29,19 @@
address sizes : 36 bits physical, 48 bits virtual
power management:
"""
+# From a Marvell Armada 370/XP
+auxv = (
+ '\x10\x00\x00\x00\xd7\xa8\x1e\x00\x06\x00\x00\x00\x00\x10\x00\x00\x11\x00'
+ '\x00\x00d\x00\x00\x00\x03\x00\x00\x004\x00\x01\x00\x04\x00\x00\x00 \x00'
+ '\x00\x00\x05\x00\x00\x00\t\x00\x00\x00\x07\x00\x00\x00\x00\xe0\xf3\xb6'
+ '\x08\x00\x00\x00\x00\x00\x00\x00\t\x00\x00\x00t\xcf\x04\x00\x0b\x00\x00'
+ '\x000\x0c\x00\x00\x0c\x00\x00\x000\x0c\x00\x00\r\x00\x00\x000\x0c\x00\x00'
+ '\x0e\x00\x00\x000\x0c\x00\x00\x17\x00\x00\x00\x00\x00\x00\x00\x19\x00\x00'
+ '\x00\x8a\xf3\x87\xbe\x1a\x00\x00\x00\x00\x00\x00\x00\x1f\x00\x00\x00\xec'
+ '\xff\x87\xbe\x0f\x00\x00\x00\x9a\xf3\x87\xbe\x00\x00\x00\x00\x00\x00\x00'
+ '\x00'
+)
+
def write_cpuinfo(info):
filepath = udir.join('get_arch_version')
@@ -46,3 +59,10 @@
py.test.raises(ValueError,
'detect_arch_version(write_cpuinfo(cpuinfo % 5))')
assert detect_arch_version(write_cpuinfo(cpuinfo2)) == 6
+
+
+def test_getauxval_no_neon():
+ path = udir.join('auxv')
+ path.write(auxv, 'wb')
+ AT_HWCAP = 16
+ assert getauxval(AT_HWCAP, filename=str(path)) == 2009303
_______________________________________________
pypy-commit mailing list
[email protected]
https://mail.python.org/mailman/listinfo/pypy-commit
