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Issue #1891 - Fix ASAN and clang crashes on Linux, BSD and MacOS. Merge with the existing Solaris fix, by folding Solaris into the Linux/BSD section. Add Apple Silicon (ARM64) support. This should also address Issue #1884 by moving the offending code into assembly.

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This commit is contained in:
Brian Smith 2022-05-05 15:53:25 -05:00 • committed by roytam1
commit fd04893c34
4 changed files with 16 additions and 213 deletions
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23
xpcom/reflect/xptcall/md/unix/moz.build
View file

@ -13,6 +13,10 @@ if CONFIG['OS_ARCH'] == 'Darwin':
'!xptcstubs_asm_ppc_darwin.s',
'xptcinvoke_asm_ppc_rhapsody.s',
]
if CONFIG['OS_TEST'] == 'x86_64':
SOURCES += [
'xptcinvoke_asm_x86_64_unix.S',
]
if '86' in CONFIG['OS_TEST'] and CONFIG['OS_TEST'] != 'x86_64':
DEFINES['MOZ_NEED_LEADING_UNDERSCORE'] = True
@ -23,10 +27,11 @@ if CONFIG['OS_ARCH'] == 'GNU':
'xptcstubs_gcc_x86_unix.cpp'
]
if CONFIG['OS_ARCH'] in ('Linux', 'Bitrig', 'DragonFly', 'FreeBSD', 'NetBSD', 'OpenBSD') or \
if CONFIG['OS_ARCH'] in ('Linux', 'Bitrig', 'DragonFly', 'FreeBSD', 'NetBSD', 'OpenBSD', 'SunOS') or \
CONFIG['OS_ARCH'].startswith('GNU_'):
if CONFIG['OS_TEST'] == 'x86_64':
SOURCES += [
'xptcinvoke_asm_x86_64_unix.S',
'xptcinvoke_x86_64_unix.cpp',
'xptcstubs_x86_64_linux.cpp',
]
@ -45,22 +50,6 @@ if CONFIG['OS_ARCH'] in ('Linux', 'FreeBSD'):
'xptcstubs_ipf64.cpp'
]
# Without the need to accomodate the Sun compiler, Solaris/GCC support is pretty
# standard, actually. Not all that different from Linux.
if CONFIG['OS_ARCH'] == 'SunOS':
if CONFIG['OS_TEST'] == 'x86_64':
SOURCES += [
'xptcinvoke_asm_x86_64_unix.S',
'xptcinvoke_x86_64_solaris.cpp',
'xptcstubs_x86_64_linux.cpp'
]
elif '86' in CONFIG['OS_TEST']:
SOURCES += [
'xptcinvoke_gcc_x86_unix.cpp',
'xptcstubs_gcc_x86_unix.cpp'
]
if CONFIG['OS_TEST'] == 'alpha':
if CONFIG['OS_ARCH'] in ('Linux', 'FreeBSD', 'NetBSD'):
SOURCES += [

2
xpcom/reflect/xptcall/md/unix/xptcinvoke_darwin.cpp
View file

@ -11,6 +11,8 @@
#include "xptcinvoke_ppc_rhapsody.cpp"
#elif defined(__arm__)
#include "xptcinvoke_arm.cpp"
#elif defined(__aarch64__)
#include "xptcinvoke_aarch64.cpp"
#else
#error unknown cpu architecture
#endif

75
xpcom/reflect/xptcall/md/unix/xptcinvoke_x86_64_solaris.cpp
View file

@ -1,75 +0,0 @@
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Platform specific code to invoke XPCOM methods on native objects
#include "xptcprivate.h"
// 6 integral parameters are passed in registers, but 1 is |this| which isn't
// considered here.
const uint32_t GPR_COUNT = 5;
// 8 floating point parameters are passed in SSE registers
const uint32_t FPR_COUNT = 8;
extern "C" void
InvokeCopyToStack(uint64_t * gpregs, double * fpregs,
uint32_t paramCount, nsXPTCVariant * s,
uint64_t* d)
{
uint32_t nr_gpr = 0u; // skip one GP register for 'that'
uint32_t nr_fpr = 0u;
uint64_t value = 0u;
for (uint32_t i = 0; i < paramCount; i++, s++) {
if (s->IsPtrData())
value = (uint64_t) s->ptr;
else {
switch (s->type) {
case nsXPTType::T_FLOAT: break;
case nsXPTType::T_DOUBLE: break;
case nsXPTType::T_I8: value = s->val.i8; break;
case nsXPTType::T_I16: value = s->val.i16; break;
case nsXPTType::T_I32: value = s->val.i32; break;
case nsXPTType::T_I64: value = s->val.i64; break;
case nsXPTType::T_U8: value = s->val.u8; break;
case nsXPTType::T_U16: value = s->val.u16; break;
case nsXPTType::T_U32: value = s->val.u32; break;
case nsXPTType::T_U64: value = s->val.u64; break;
case nsXPTType::T_BOOL: value = s->val.b; break;
case nsXPTType::T_CHAR: value = s->val.c; break;
case nsXPTType::T_WCHAR: value = s->val.wc; break;
default: value = (uint64_t) s->val.p; break;
}
}
if (!s->IsPtrData() && s->type == nsXPTType::T_DOUBLE) {
if (nr_fpr < FPR_COUNT)
fpregs[nr_fpr++] = s->val.d;
else {
*((double *)d) = s->val.d;
d++;
}
}
else if (!s->IsPtrData() && s->type == nsXPTType::T_FLOAT) {
if (nr_fpr < FPR_COUNT)
// The value in %xmm register is already prepared to
// be retrieved as a float. Therefore, we pass the
// value verbatim, as a double without conversion.
fpregs[nr_fpr++] = s->val.d;
else {
*((float *)d) = s->val.f;
d++;
}
}
else {
if (nr_gpr < GPR_COUNT)
gpregs[nr_gpr++] = value;
else
*d++ = value;
}
}
}

129
xpcom/reflect/xptcall/md/unix/xptcinvoke_x86_64_unix.cpp
View file

@ -8,46 +8,19 @@
#include "xptcprivate.h"
// 6 integral parameters are passed in registers
const uint32_t GPR_COUNT = 6;
// 6 integral parameters are passed in registers, but 1 is |this| which isn't
// considered here.
const uint32_t GPR_COUNT = 5;
// 8 floating point parameters are passed in SSE registers
const uint32_t FPR_COUNT = 8;
// Remember that these 'words' are 64-bit long
static inline void
invoke_count_words(uint32_t paramCount, nsXPTCVariant * s,
uint32_t & nr_stack)
extern "C" void
InvokeCopyToStack(uint64_t * gpregs, double * fpregs,
uint32_t paramCount, nsXPTCVariant * s,
uint64_t* d)
{
uint32_t nr_gpr;
uint32_t nr_fpr;
nr_gpr = 1; // skip one GP register for 'that'
nr_fpr = 0;
nr_stack = 0;
/* Compute number of eightbytes of class MEMORY. */
for (uint32_t i = 0; i < paramCount; i++, s++) {
if (!s->IsPtrData()
&& (s->type == nsXPTType::T_FLOAT || s->type == nsXPTType::T_DOUBLE)) {
if (nr_fpr < FPR_COUNT)
nr_fpr++;
else
nr_stack++;
}
else {
if (nr_gpr < GPR_COUNT)
nr_gpr++;
else
nr_stack++;
}
}
}
static void
invoke_copy_to_stack(uint64_t * d, uint32_t paramCount, nsXPTCVariant * s,
uint64_t * gpregs, double * fpregs)
{
uint32_t nr_gpr = 1u; // skip one GP register for 'that'
uint32_t nr_gpr = 0u;
uint32_t nr_fpr = 0u;
uint64_t value = 0u;
@ -100,89 +73,3 @@ invoke_copy_to_stack(uint64_t * d, uint32_t paramCount, nsXPTCVariant * s,
}
}
}
// Disable avx for the next function to allow compilation with
// -march=native on new machines, or similar hardcoded -march options.
// Having avx enabled appears to change the alignment behavior of alloca
// (apparently adding an extra 16 bytes) of padding/alignment (and using
// 32-byte alignment instead of 16-byte). This seems to be the best
// available workaround, given that this code, which should perhaps
// better be written in assembly, is written in C++.
#ifndef __clang__
#pragma GCC push_options
#pragma GCC target ("no-avx")
#endif
// Avoid AddressSanitizer instrumentation for the next function because it
// depends on __builtin_alloca behavior and alignment that cannot be relied on
// once the function is compiled with a version of ASan that has dynamic-alloca
// instrumentation enabled.
MOZ_ASAN_BLACKLIST
EXPORT_XPCOM_API(nsresult)
NS_InvokeByIndex(nsISupports * that, uint32_t methodIndex,
uint32_t paramCount, nsXPTCVariant * params)
{
uint32_t nr_stack;
invoke_count_words(paramCount, params, nr_stack);
// Stack, if used, must be 16-bytes aligned
if (nr_stack)
nr_stack = (nr_stack + 1) & ~1;
// Load parameters to stack, if necessary
uint64_t *stack = (uint64_t *) __builtin_alloca(nr_stack * 8);
uint64_t gpregs[GPR_COUNT];
double fpregs[FPR_COUNT];
invoke_copy_to_stack(stack, paramCount, params, gpregs, fpregs);
// We used to have switches to make sure we would only load the registers
// that are needed for this call. That produced larger code that was
// not faster in practice. It also caused compiler warnings about the
// variables being used uninitialized.
// We now just load every every register. There could still be a warning
// from a memory analysis tools that we are loading uninitialized stack
// positions.
// FIXME: this function depends on the above __builtin_alloca placing
// the array in the correct spot for the ABI.
// Load FPR registers from fpregs[]
double d0, d1, d2, d3, d4, d5, d6, d7;
d7 = fpregs[7];
d6 = fpregs[6];
d5 = fpregs[5];
d4 = fpregs[4];
d3 = fpregs[3];
d2 = fpregs[2];
d1 = fpregs[1];
d0 = fpregs[0];
// Load GPR registers from gpregs[]
uint64_t a0, a1, a2, a3, a4, a5;
a5 = gpregs[5];
a4 = gpregs[4];
a3 = gpregs[3];
a2 = gpregs[2];
a1 = gpregs[1];
a0 = (uint64_t) that;
// Get pointer to method
uint64_t methodAddress = *((uint64_t *)that);
methodAddress += 8 * methodIndex;
methodAddress = *((uint64_t *)methodAddress);
typedef nsresult (*Method)(uint64_t, uint64_t, uint64_t, uint64_t,
uint64_t, uint64_t, double, double, double,
double, double, double, double, double);
nsresult result = ((Method)methodAddress)(a0, a1, a2, a3, a4, a5,
d0, d1, d2, d3, d4, d5,
d6, d7);
return result;
}
#ifndef __clang__
#pragma GCC pop_options
#endif