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[fuchsia] Don't build CaptureContext

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CaptureContext isn't actually used on Fuchsia and there is a desire to
remove `ucontext_t` from Fuchsia as it isn't a real concept on Fuchsia
and was only added as a placeholder. Moreover, `ucontext_t` won't ever
be added to Fuchsia for RISC-V.

Bug: fuchsia:123052
Fixed: fuchsia:131112
Fixed: fuchsia:127655
Tested: `fx test crashpad` on core.x64 emulator
Tested: `fx test crashpad` on ARM64 device
Tested: `fx shell crasher` @ 16b19a9891978487 on ARM64 device, ran
through Breakpad stackwalker locally as well
Tested: `fx build crashpad_tests` for minimal.riscv64
Change-Id: I4695054426df78a9deff8c9ea9c478b5bf9701b1
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/4717085
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Thomas Gales <tgales@google.com>
This commit is contained in:
Thomas Gales 2023-07-25 17:14:58 +00:00 committed by Crashpad LUCI CQ
parent 3df478b96d
commit 8dcf2b216f
6 changed files with 14 additions and 336 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
client/crashpad_client.h
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@ -27,7 +27,10 @@
#include "build/build_config.h" #include "build/build_config.h"
#include "build/chromeos_buildflags.h" #include "build/chromeos_buildflags.h"
#include "util/file/file_io.h" #include "util/file/file_io.h"
#if !BUILDFLAG(IS_FUCHSIA)
#include "util/misc/capture_context.h" #include "util/misc/capture_context.h"
#endif // !BUILDFLAG(IS_FUCHSIA)
#if BUILDFLAG(IS_APPLE) #if BUILDFLAG(IS_APPLE)
#include "base/mac/scoped_mach_port.h" #include "base/mac/scoped_mach_port.h"

8
util/BUILD.gn
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@ -555,11 +555,12 @@ crashpad_static_library("util") {
"fuchsia/scoped_task_suspend.cc", "fuchsia/scoped_task_suspend.cc",
"fuchsia/scoped_task_suspend.h", "fuchsia/scoped_task_suspend.h",
"fuchsia/traits.h", "fuchsia/traits.h",
"misc/capture_context_fuchsia.S",
"misc/paths_fuchsia.cc", "misc/paths_fuchsia.cc",
"process/process_memory_fuchsia.cc", "process/process_memory_fuchsia.cc",
"process/process_memory_fuchsia.h", "process/process_memory_fuchsia.h",
] ]
sources -= [ "misc/capture_context.h" ]
} }
public_configs = [ "..:crashpad_config" ] public_configs = [ "..:crashpad_config" ]
@ -869,7 +870,10 @@ source_set("util_test") {
} }
if (crashpad_is_fuchsia) { if (crashpad_is_fuchsia) {
sources += [ "misc/capture_context_test_util_fuchsia.cc" ] sources -= [
"misc/capture_context_test.cc",
"misc/capture_context_test_util.h",
]
} }
if (crashpad_is_win) { if (crashpad_is_win) {

10
util/misc/capture_context.h
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@ -23,8 +23,6 @@
#include <windows.h> #include <windows.h>
#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID) #elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID)
#include <ucontext.h> #include <ucontext.h>
#elif BUILDFLAG(IS_FUCHSIA)
#include <signal.h>
#endif // BUILDFLAG(IS_APPLE) #endif // BUILDFLAG(IS_APPLE)
namespace crashpad { namespace crashpad {
@ -37,8 +35,7 @@ using NativeCPUContext = arm_unified_thread_state;
#endif #endif
#elif BUILDFLAG(IS_WIN) #elif BUILDFLAG(IS_WIN)
using NativeCPUContext = CONTEXT; using NativeCPUContext = CONTEXT;
#elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || \ #elif BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_ANDROID)
BUILDFLAG(IS_ANDROID) || BUILDFLAG(IS_FUCHSIA)
using NativeCPUContext = ucontext_t; using NativeCPUContext = ucontext_t;
#endif // BUILDFLAG(IS_APPLE) #endif // BUILDFLAG(IS_APPLE)
@ -57,6 +54,9 @@ using NativeCPUContext = ucontext_t;
//! `RtlCaptureContext()` capture only the state of the integer registers, //! `RtlCaptureContext()` capture only the state of the integer registers,
//! ignoring floating-point and vector state. //! ignoring floating-point and vector state.
//! //!
//! CaptureContext isn't used on Fuchsia, nor does a concept of `ucontext_t`
//! exist on Fuchsia.
//!
//! \param[out] cpu_context The structure to store the context in. //! \param[out] cpu_context The structure to store the context in.
//! //!
//! \note The ABI may require that this function's argument is passed by //! \note The ABI may require that this function's argument is passed by
@ -66,7 +66,7 @@ using NativeCPUContext = ucontext_t;
//! OS | Architecture | Register //! OS | Architecture | Register
//! --------------------|--------------|--------- //! --------------------|--------------|---------
//! Win | x86_64 | `%%rcx` //! Win | x86_64 | `%%rcx`
//! macOS/Linux/Fuchsia | x86_64 | `%%rdi` //! macOS/Linux | x86_64 | `%%rdi`
//! Linux | ARM/ARM64 | `r0`/`x0` //! Linux | ARM/ARM64 | `r0`/`x0`
//! Linux | MIPS/MIPS64 | `$a0` //! Linux | MIPS/MIPS64 | `$a0`
//! Linux | RISCV64 | `a0` //! Linux | RISCV64 | `a0`

255
util/misc/capture_context_fuchsia.S
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@ -1,255 +0,0 @@
// Copyright 2018 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// namespace crashpad {
// void CaptureContext(ucontext_t* context);
// } // namespace crashpad
#define CAPTURECONTEXT_SYMBOL _ZN8crashpad14CaptureContextEP8ucontext
.text
.globl CAPTURECONTEXT_SYMBOL
#if defined(__x86_64__)
.balign 16, 0x90
#elif defined(__aarch64__)
.balign 4, 0x0
#elif defined(__riscv)
.balign 4, 0x0
#endif
CAPTURECONTEXT_SYMBOL:
#if defined(__x86_64__)
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
// Note that 16-byte stack alignment is not maintained because this function
// does not call out to any other.
// pushfq first, because some instructions (but probably none used here)
// affect %rflags. %rflags will be in -8(%rbp).
pushfq
// General-purpose registers whose values haven’t changed can be captured
// directly.
movq %r8, 0x28(%rdi) // context->uc_mcontext.r8
movq %r9, 0x30(%rdi) // context->uc_mcontext.r9
movq %r10, 0x38(%rdi) // context->uc_mcontext.r10
movq %r11, 0x40(%rdi) // context->uc_mcontext.r11
movq %r12, 0x48(%rdi) // context->uc_mcontext.r12
movq %r13, 0x50(%rdi) // context->uc_mcontext.r13
movq %r14, 0x58(%rdi) // context->uc_mcontext.r14
movq %r15, 0x60(%rdi) // context->uc_mcontext.r15
// Because of the calling convention, there’s no way to recover the value of
// the caller’s %rdi as it existed prior to calling this function. This
// function captures a snapshot of the register state at its return, which
// involves %rdi containing a pointer to its first argument. Callers that
// require the value of %rdi prior to calling this function should obtain it
// separately. For example:
// uint64_t rdi;
// asm("movq %%rdi, %0" : "=m"(rdi));
movq %rdi, 0x68(%rdi) // context->uc_mcontext.rdi
movq %rsi, 0x70(%rdi) // context->uc_mcontext.rsi
// Use %r8 as a scratch register now that it has been saved.
// The original %rbp was saved on the stack in this function’s prologue.
movq (%rbp), %r8
movq %r8, 0x78(%rdi) // context->uc_mcontext.rbp
// Save the remaining general-purpose registers.
movq %rbx, 0x80(%rdi) // context->uc_mcontext.rbx
movq %rdx, 0x88(%rdi) // context->uc_mcontext.rdx
movq %rax, 0x90(%rdi) // context->uc_mcontext.rax
movq %rcx, 0x98(%rdi) // context->uc_mcontext.rcx
// %rsp was saved in %rbp in this function’s prologue, but the caller’s %rsp
// is 16 more than this value: 8 for the original %rbp saved on the stack in
// this function’s prologue, and 8 for the return address saved on the stack
// by the call instruction that reached this function.
leaq 16(%rbp), %r8
movq %r8, 0xa0(%rdi) // context->uc_mcontext.rsp
// The return address saved on the stack used by the call of this function is
// likely more useful than the current RIP here.
movq 8(%rbp), %r8
movq %r8, 0xa8(%rdi) // context->uc_mcontext.rip
// The original %rflags was saved on the stack above.
movq -8(%rbp), %r8
movq %r8, 0xb0(%rdi) // context->uc_mcontext.eflags
// Save the segment registers
movw %cs, 0xb8(%rdi) // context->uc_mcontext.cs
movw %gs, 0xba(%rdi) // context->uc_mcontext.gs
movw %fs, 0xbc(%rdi) // context->uc_mcontext.fs
xorw %ax, %ax
movw %ax, 0xbe(%rdi) // context->uc_mcontext.padding
// Zero out the remainder of the unused pseudo-registers
xorq %r8, %r8
movq %r8, 0xc0(%rdi) // context->uc_mcontext.err
movq %r8, 0xc8(%rdi) // context->uc_mcontext.trapno
movq %r8, 0xd0(%rdi) // context->uc_mcontext.oldmask
movq %r8, 0xd8(%rdi) // context->uc_mcontext.cr2
// Clean up by restoring clobbered registers, even those considered volatile
// by the ABI, so that the captured context represents the state at this
// function’s exit.
movq 0x90(%rdi), %rax
movq 0x28(%rdi), %r8
// TODO(https://crashpad.chromium.org/bug/300): save floating-point registers.
popfq
popq %rbp
ret
.cfi_endproc
#elif defined(__aarch64__)
// Zero out fault_address, which is unused.
str x31, [x0, #0xb0] // context->uc_mcontext.fault_address
// Save general purpose registers in context->uc_mcontext.regs[i].
// The original x0 can't be recovered.
stp x0, x1, [x0, #0xb8]
stp x2, x3, [x0, #0xc8]
stp x4, x5, [x0, #0xd8]
stp x6, x7, [x0, #0xe8]
stp x8, x9, [x0, #0xf8]
stp x10, x11, [x0, #0x108]
stp x12, x13, [x0, #0x118]
stp x14, x15, [x0, #0x128]
stp x16, x17, [x0, #0x138]
stp x18, x19, [x0, #0x148]
stp x20, x21, [x0, #0x158]
stp x22, x23, [x0, #0x168]
stp x24, x25, [x0, #0x178]
stp x26, x27, [x0, #0x188]
stp x28, x29, [x0, #0x198]
// The original LR can't be recovered.
str LR, [x0, #0x1a8]
// Use x1 as a scratch register.
mov x1, SP
str x1, [x0, #0x1b0] // context->uc_mcontext.sp
// The link register holds the return address for this function.
str LR, [x0, #0x1b8] // context->uc_mcontext.pc
// pstate should hold SPSR but NZCV are the only bits we know about.
mrs x1, NZCV
str x1, [x0, #0x1c0] // context->uc_mcontext.pstate
// Restore x1 from the saved context.
ldr x1, [x0, #0xc0]
// TODO(https://crashpad.chromium.org/bug/300): save floating-point registers.
ret
#elif defined(__riscv)
#define MCONTEXT_GREGS_OFFSET 176
// x1/ra is the return address. Store it as the pc.
// The original x10/a0 can't be recovered.
sd x1, (0 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x1, (1 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x2, (2 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x3, (3 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x4, (4 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x5, (5 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x6, (6 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x7, (7 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x8, (8 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x9, (9 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x10, (10 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x11, (11 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x12, (12 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x13, (13 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x14, (14 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x15, (15 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x16, (16 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x17, (17 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x18, (18 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x19, (19 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x20, (20 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x21, (21 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x22, (22 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x23, (23 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x24, (24 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x25, (25 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x26, (26 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x27, (27 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x28, (28 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x29, (29 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x30, (30 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
sd x31, (31 * 8 + MCONTEXT_GREGS_OFFSET)(a0)
#define MCONTEXT_FPREGS_OFFSET MCONTEXT_GREGS_OFFSET + 32*8
// Use x31/t6 as scratch register.
frcsr x31
sw x31, (32 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f0, (0 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f1, (1 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f2, (2 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f3, (3 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f4, (4 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f5, (5 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f6, (6 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f7, (7 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f8, (8 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f9, (9 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f10, (10 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f11, (11 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f12, (12 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f13, (13 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f14, (14 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f15, (15 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f16, (16 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f17, (17 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f18, (18 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f19, (19 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f20, (20 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f21, (21 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f22, (22 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f23, (23 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f24, (24 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f25, (25 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f26, (26 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f27, (27 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f28, (28 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f29, (29 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f30, (30 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
fsd f31, (31 * 8 + MCONTEXT_FPREGS_OFFSET)(a0)
ret
#endif // __x86_64__

9
util/misc/capture_context_test.cc
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@ -28,15 +28,6 @@ namespace crashpad {
namespace test { namespace test {
namespace { namespace {
#if BUILDFLAG(IS_FUCHSIA)
// Fuchsia uses -fsanitize=safe-stack by default, which splits local variables
// and the call stack into separate regions (see
// https://clang.llvm.org/docs/SafeStack.html). Because this test would like to
// find an approximately valid stack pointer by comparing locals to the
// captured one, disable safe-stack for this function.
__attribute__((no_sanitize("safe-stack")))
#endif // BUILDFLAG(IS_FUCHSIA)
#if defined(MEMORY_SANITIZER) #if defined(MEMORY_SANITIZER)
// CaptureContext() calls inline assembly and is incompatible with MSan. // CaptureContext() calls inline assembly and is incompatible with MSan.
__attribute__((no_sanitize("memory"))) __attribute__((no_sanitize("memory")))

65
util/misc/capture_context_test_util_fuchsia.cc
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@ -1,65 +0,0 @@
// Copyright 2018 The Crashpad Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "util/misc/capture_context_test_util.h"
#include "gtest/gtest.h"
#include "util/misc/from_pointer_cast.h"
namespace crashpad {
namespace test {
#if defined(ARCH_CPU_X86_64)
static_assert(offsetof(NativeCPUContext, uc_mcontext) == 0x28,
"unexpected mcontext offset");
static_assert(offsetof(NativeCPUContext, uc_mcontext.gregs[REG_RSP]) == 0xa0,
"unexpected rsp offset");
static_assert(offsetof(NativeCPUContext, uc_mcontext.gregs[REG_RIP]) == 0xa8,
"unexpected rip offset");
#endif // ARCH_CPU_X86_64
void SanityCheckContext(const NativeCPUContext& context) {
#if defined(ARCH_CPU_X86_64)
EXPECT_EQ(context.uc_mcontext.gregs[REG_RDI],
FromPointerCast<intptr_t>(&context));
#elif defined(ARCH_CPU_ARM64)
EXPECT_EQ(context.uc_mcontext.regs[0], FromPointerCast<uintptr_t>(&context));
#elif defined(ARCH_CPU_RISCV64)
EXPECT_EQ(context.uc_mcontext.__gregs[10],
FromPointerCast<uintptr_t>(&context));
#endif
}
uintptr_t ProgramCounterFromContext(const NativeCPUContext& context) {
#if defined(ARCH_CPU_X86_64)
return context.uc_mcontext.gregs[REG_RIP];
#elif defined(ARCH_CPU_ARM64)
return context.uc_mcontext.pc;
#elif defined(ARCH_CPU_RISCV64)
return context.uc_mcontext.__gregs[0];
#endif
}
uintptr_t StackPointerFromContext(const NativeCPUContext& context) {
#if defined(ARCH_CPU_X86_64)
return context.uc_mcontext.gregs[REG_RSP];
#elif defined(ARCH_CPU_ARM64)
return context.uc_mcontext.sp;
#elif defined(ARCH_CPU_RISCV64)
return context.uc_mcontext.__gregs[2];
#endif
}
} // namespace test
} // namespace crashpad