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Support segmented stacks on 64-bit FreeBSD. 

This patch uses tcb_spare field in the tcb structure to store info.
Patch by Jyun-Yan You.

llvm-svn: 148041
This commit is contained in:
Rafael Espindola 2012-01-12 20:24:30 +00:00
parent 10745d3381
commit 00e861ed57
2 changed files with 60 additions and 2 deletions
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10
llvm/lib/Target/X86/X86FrameLowering.cpp
View File

@ -1357,8 +1357,9 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
if (MF.getFunction()->isVarArg())
report_fatal_error("Segmented stacks do not support vararg functions.");
if (!ST->isTargetLinux() && !ST->isTargetDarwin() && !ST->isTargetWin32())
report_fatal_error("Segmented stacks supported only on linux, darwin and win32.");
if (!ST->isTargetLinux() && !ST->isTargetDarwin() &&
!ST->isTargetWin32() && !ST->isTargetFreeBSD())
report_fatal_error("Segmented stacks not supported on this platform.");
MachineBasicBlock *allocMBB = MF.CreateMachineBasicBlock();
MachineBasicBlock *checkMBB = MF.CreateMachineBasicBlock();
@ -1401,6 +1402,9 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
} else if (ST->isTargetDarwin()) {
TlsReg = X86::GS;
TlsOffset = 0x60 + 90*8; // See pthread_machdep.h. Steal TLS slot 90.
} else if (ST->isTargetFreeBSD()) {
TlsReg = X86::FS;
TlsOffset = 0x18;
} else {
report_fatal_error("Segmented stacks not supported on this platform.");
}
@ -1423,6 +1427,8 @@ X86FrameLowering::adjustForSegmentedStacks(MachineFunction &MF) const {
} else if (ST->isTargetWin32()) {
TlsReg = X86::FS;
TlsOffset = 0x14; // pvArbitrary, reserved for application use
} else if (ST->isTargetFreeBSD()) {
report_fatal_error("Segmented stacks not supported on FreeBSD i386.");
} else {
report_fatal_error("Segmented stacks not supported on this platform.");
}

52
llvm/test/CodeGen/X86/segmented-stacks.ll
View File

@ -3,6 +3,7 @@
; RUN: llc < %s -mtriple=i686-darwin -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X32-Darwin
; RUN: llc < %s -mtriple=x86_64-darwin -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X64-Darwin
; RUN: llc < %s -mtriple=i686-mingw32 -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X32-MinGW
; RUN: llc < %s -mtriple=x86_64-freebsd -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=X64-FreeBSD
; We used to crash with filetype=obj
; RUN: llc < %s -mtriple=i686-linux -segmented-stacks -filetype=obj
@ -10,6 +11,7 @@
; RUN: llc < %s -mtriple=i686-darwin -segmented-stacks -filetype=obj
; RUN: llc < %s -mtriple=x86_64-darwin -segmented-stacks -filetype=obj
; RUN: llc < %s -mtriple=i686-mingw32 -segmented-stacks -filetype=obj
; RUN: llc < %s -mtriple=x86_64-freebsd -segmented-stacks -filetype=obj
; Just to prevent the alloca from being optimized away
declare void @dummy_use(i32*, i32)
@ -70,6 +72,16 @@ define void @test_basic() {
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
; X64-FreeBSD: test_basic:
; X64-FreeBSD: cmpq %fs:24, %rsp
; X64-FreeBSD-NEXT: ja .LBB0_2
; X64-FreeBSD: movabsq $40, %r10
; X64-FreeBSD-NEXT: movabsq $0, %r11
; X64-FreeBSD-NEXT: callq __morestack
; X64-FreeBSD-NEXT: ret
}
define i32 @test_nested(i32 * nest %closure, i32 %other) {
@ -122,6 +134,16 @@ define i32 @test_nested(i32 * nest %closure, i32 %other) {
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
; X64-FreeBSD: cmpq %fs:24, %rsp
; X64-FreeBSD-NEXT: ja .LBB1_2
; X64-FreeBSD: movq %r10, %rax
; X64-FreeBSD-NEXT: movabsq $0, %r10
; X64-FreeBSD-NEXT: movabsq $0, %r11
; X64-FreeBSD-NEXT: callq __morestack
; X64-FreeBSD-NEXT: ret
; X64-FreeBSD-NEXT: movq %rax, %r10
}
define void @test_large() {
@ -175,6 +197,15 @@ define void @test_large() {
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
; X64-FreeBSD: leaq -40008(%rsp), %r11
; X64-FreeBSD-NEXT: cmpq %fs:24, %r11
; X64-FreeBSD-NEXT: ja .LBB2_2
; X64-FreeBSD: movabsq $40008, %r10
; X64-FreeBSD-NEXT: movabsq $0, %r11
; X64-FreeBSD-NEXT: callq __morestack
; X64-FreeBSD-NEXT: ret
}
define fastcc void @test_fastcc() {
@ -233,6 +264,16 @@ define fastcc void @test_fastcc() {
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
; X64-FreeBSD: test_fastcc:
; X64-FreeBSD: cmpq %fs:24, %rsp
; X64-FreeBSD-NEXT: ja .LBB3_2
; X64-FreeBSD: movabsq $40, %r10
; X64-FreeBSD-NEXT: movabsq $0, %r11
; X64-FreeBSD-NEXT: callq __morestack
; X64-FreeBSD-NEXT: ret
}
define fastcc void @test_fastcc_large() {
@ -296,6 +337,17 @@ define fastcc void @test_fastcc_large() {
; X32-MinGW-NEXT: calll ___morestack
; X32-MinGW-NEXT: ret
; X64-FreeBSD: test_fastcc_large:
; X64-FreeBSD: leaq -40008(%rsp), %r11
; X64-FreeBSD-NEXT: cmpq %fs:24, %r11
; X64-FreeBSD-NEXT: ja .LBB4_2
; X64-FreeBSD: movabsq $40008, %r10
; X64-FreeBSD-NEXT: movabsq $0, %r11
; X64-FreeBSD-NEXT: callq __morestack
; X64-FreeBSD-NEXT: ret
}
define fastcc void @test_fastcc_large_with_ecx_arg(i32 %a) {