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aports/community/php82/fibers-x86-10407.patch
Andy Postnikov 02c09ee189 community/php82: upgrade to 8.2.2
2023-02-04 00:17:02 +00:00

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Patch-Source: https://github.com/php/php-src/pull/10407
From a9eed6038b37cfe55ca1ba8d389a1fadd1b78937 Mon Sep 17 00:00:00 2001
From: Niels Dossche <7771979+nielsdos@users.noreply.github.com>
Date: Sat, 21 Jan 2023 20:49:31 +0100
Subject: [PATCH] Sync boost/context assembly files for fibers
Fixes GH-10398
The stack was misaligned upon entering the trampoline function [1], this
causes a CPU trap when the SSE instruction is executed to copy data from
the stack. This was fixed upstream [2]. This commit syncs all upstream
changes from the boost/context assembly files to our copy.
[1] https://github.com/php/php-src/pull/10407#issuecomment-1404180877
[2] https://github.com/boostorg/context/pull/219
---
Zend/asm/jump_i386_sysv_elf_gas.S | 44 ++++---
Zend/asm/jump_ppc32_sysv_macho_gas.S | 184 +++++++++++++--------------
Zend/asm/jump_ppc64_sysv_macho_gas.S | 18 +--
Zend/asm/jump_x86_64_sysv_elf_gas.S | 79 +++++++++---
Zend/asm/make_i386_sysv_elf_gas.S | 26 ++--
Zend/asm/make_i386_sysv_macho_gas.S | 4 +-
Zend/asm/make_ppc32_sysv_macho_gas.S | 83 +++++++-----
Zend/asm/make_ppc64_sysv_macho_gas.S | 16 +--
Zend/asm/make_x86_64_sysv_elf_gas.S | 71 ++++++++++-
9 files changed, 330 insertions(+), 195 deletions(-)
diff --git a/Zend/asm/jump_i386_sysv_elf_gas.S b/Zend/asm/jump_i386_sysv_elf_gas.S
index b96d4b5c0e70..47be9e77822e 100644
--- a/Zend/asm/jump_i386_sysv_elf_gas.S
+++ b/Zend/asm/jump_i386_sysv_elf_gas.S
@@ -12,14 +12,14 @@
* ---------------------------------------------------------------------------------- *
* | 0x0 | 0x4 | 0x8 | 0xc | 0x10 | 0x14 | 0x18 | 0x1c | *
* ---------------------------------------------------------------------------------- *
- * | fc_mxcsr|fc_x87_cw| EDI | ESI | EBX | EBP | EIP | hidden | *
+ * | fc_mxcsr|fc_x87_cw| guard | EDI | ESI | EBX | EBP | EIP | *
* ---------------------------------------------------------------------------------- *
* ---------------------------------------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ---------------------------------------------------------------------------------- *
- * | 0x20 | 0x24 | | *
+ * | 0x20 | 0x24 | 0x28 | | *
* ---------------------------------------------------------------------------------- *
- * | to | data | | *
+ * | hidden | to | data | | *
* ---------------------------------------------------------------------------------- *
* *
****************************************************************************************/
@@ -30,50 +30,60 @@
.align 2
.type jump_fcontext,@function
jump_fcontext:
- leal -0x18(%esp), %esp /* prepare stack */
+ leal -0x1c(%esp), %esp /* prepare stack */
#if !defined(BOOST_USE_TSX)
stmxcsr (%esp) /* save MMX control- and status-word */
fnstcw 0x4(%esp) /* save x87 control-word */
#endif
- movl %edi, 0x8(%esp) /* save EDI */
- movl %esi, 0xc(%esp) /* save ESI */
- movl %ebx, 0x10(%esp) /* save EBX */
- movl %ebp, 0x14(%esp) /* save EBP */
+#if defined(BOOST_CONTEXT_TLS_STACK_PROTECTOR)
+ movl %gs:0x14, %ecx /* read stack guard from TLS record */
+ movl %ecx, 0x8(%esp) /* save stack guard */
+#endif
+
+ movl %edi, 0xc(%esp) /* save EDI */
+ movl %esi, 0x10(%esp) /* save ESI */
+ movl %ebx, 0x14(%esp) /* save EBX */
+ movl %ebp, 0x18(%esp) /* save EBP */
/* store ESP (pointing to context-data) in ECX */
movl %esp, %ecx
/* first arg of jump_fcontext() == fcontext to jump to */
- movl 0x20(%esp), %eax
+ movl 0x24(%esp), %eax
/* second arg of jump_fcontext() == data to be transferred */
- movl 0x24(%esp), %edx
+ movl 0x28(%esp), %edx
/* restore ESP (pointing to context-data) from EAX */
movl %eax, %esp
/* address of returned transport_t */
- movl 0x1c(%esp), %eax
+ movl 0x20(%esp), %eax
/* return parent fcontext_t */
movl %ecx, (%eax)
/* return data */
movl %edx, 0x4(%eax)
- movl 0x18(%esp), %ecx /* restore EIP */
+ movl 0x1c(%esp), %ecx /* restore EIP */
#if !defined(BOOST_USE_TSX)
ldmxcsr (%esp) /* restore MMX control- and status-word */
fldcw 0x4(%esp) /* restore x87 control-word */
#endif
- movl 0x8(%esp), %edi /* restore EDI */
- movl 0xc(%esp), %esi /* restore ESI */
- movl 0x10(%esp), %ebx /* restore EBX */
- movl 0x14(%esp), %ebp /* restore EBP */
+#if defined(BOOST_CONTEXT_TLS_STACK_PROTECTOR)
+ movl 0x8(%esp), %edx /* load stack guard */
+ movl %edx, %gs:0x14 /* restore stack guard to TLS record */
+#endif
+
+ movl 0xc(%esp), %edi /* restore EDI */
+ movl 0x10(%esp), %esi /* restore ESI */
+ movl 0x14(%esp), %ebx /* restore EBX */
+ movl 0x18(%esp), %ebp /* restore EBP */
- leal 0x20(%esp), %esp /* prepare stack */
+ leal 0x24(%esp), %esp /* prepare stack */
/* jump to context */
jmp *%ecx
diff --git a/Zend/asm/jump_ppc32_sysv_macho_gas.S b/Zend/asm/jump_ppc32_sysv_macho_gas.S
index c555237afa2e..fef90c295f8c 100644
--- a/Zend/asm/jump_ppc32_sysv_macho_gas.S
+++ b/Zend/asm/jump_ppc32_sysv_macho_gas.S
@@ -80,122 +80,122 @@ _jump_fcontext:
; reserve space on stack
subi r1, r1, 244
- stfd f14, 0(r1) # save F14
- stfd f15, 8(r1) # save F15
- stfd f16, 16(r1) # save F16
- stfd f17, 24(r1) # save F17
- stfd f18, 32(r1) # save F18
- stfd f19, 40(r1) # save F19
- stfd f20, 48(r1) # save F20
- stfd f21, 56(r1) # save F21
- stfd f22, 64(r1) # save F22
- stfd f23, 72(r1) # save F23
- stfd f24, 80(r1) # save F24
- stfd f25, 88(r1) # save F25
- stfd f26, 96(r1) # save F26
- stfd f27, 104(r1) # save F27
- stfd f28, 112(r1) # save F28
- stfd f29, 120(r1) # save F29
- stfd f30, 128(r1) # save F30
- stfd f31, 136(r1) # save F31
- mffs f0 # load FPSCR
- stfd f0, 144(r1) # save FPSCR
+ stfd f14, 0(r1) ; save F14
+ stfd f15, 8(r1) ; save F15
+ stfd f16, 16(r1) ; save F16
+ stfd f17, 24(r1) ; save F17
+ stfd f18, 32(r1) ; save F18
+ stfd f19, 40(r1) ; save F19
+ stfd f20, 48(r1) ; save F20
+ stfd f21, 56(r1) ; save F21
+ stfd f22, 64(r1) ; save F22
+ stfd f23, 72(r1) ; save F23
+ stfd f24, 80(r1) ; save F24
+ stfd f25, 88(r1) ; save F25
+ stfd f26, 96(r1) ; save F26
+ stfd f27, 104(r1) ; save F27
+ stfd f28, 112(r1) ; save F28
+ stfd f29, 120(r1) ; save F29
+ stfd f30, 128(r1) ; save F30
+ stfd f31, 136(r1) ; save F31
+ mffs f0 ; load FPSCR
+ stfd f0, 144(r1) ; save FPSCR
- stw r13, 152(r1) # save R13
- stw r14, 156(r1) # save R14
- stw r15, 160(r1) # save R15
- stw r16, 164(r1) # save R16
- stw r17, 168(r1) # save R17
- stw r18, 172(r1) # save R18
- stw r19, 176(r1) # save R19
- stw r20, 180(r1) # save R20
- stw r21, 184(r1) # save R21
- stw r22, 188(r1) # save R22
- stw r23, 192(r1) # save R23
- stw r24, 196(r1) # save R24
- stw r25, 200(r1) # save R25
- stw r26, 204(r1) # save R26
- stw r27, 208(r1) # save R27
- stw r28, 212(r1) # save R28
- stw r29, 216(r1) # save R29
- stw r30, 220(r1) # save R30
- stw r31, 224(r1) # save R31
- stw r3, 228(r1) # save hidden
+ stw r13, 152(r1) ; save R13
+ stw r14, 156(r1) ; save R14
+ stw r15, 160(r1) ; save R15
+ stw r16, 164(r1) ; save R16
+ stw r17, 168(r1) ; save R17
+ stw r18, 172(r1) ; save R18
+ stw r19, 176(r1) ; save R19
+ stw r20, 180(r1) ; save R20
+ stw r21, 184(r1) ; save R21
+ stw r22, 188(r1) ; save R22
+ stw r23, 192(r1) ; save R23
+ stw r24, 196(r1) ; save R24
+ stw r25, 200(r1) ; save R25
+ stw r26, 204(r1) ; save R26
+ stw r27, 208(r1) ; save R27
+ stw r28, 212(r1) ; save R28
+ stw r29, 216(r1) ; save R29
+ stw r30, 220(r1) ; save R30
+ stw r31, 224(r1) ; save R31
+ stw r3, 228(r1) ; save hidden
- # save CR
+ ; save CR
mfcr r0
stw r0, 232(r1)
- # save LR
+ ; save LR
mflr r0
stw r0, 236(r1)
- # save LR as PC
+ ; save LR as PC
stw r0, 240(r1)
- # store RSP (pointing to context-data) in R6
+ ; store RSP (pointing to context-data) in R6
mr r6, r1
- # restore RSP (pointing to context-data) from R4
+ ; restore RSP (pointing to context-data) from R4
mr r1, r4
- lfd f14, 0(r1) # restore F14
- lfd f15, 8(r1) # restore F15
- lfd f16, 16(r1) # restore F16
- lfd f17, 24(r1) # restore F17
- lfd f18, 32(r1) # restore F18
- lfd f19, 40(r1) # restore F19
- lfd f20, 48(r1) # restore F20
- lfd f21, 56(r1) # restore F21
- lfd f22, 64(r1) # restore F22
- lfd f23, 72(r1) # restore F23
- lfd f24, 80(r1) # restore F24
- lfd f25, 88(r1) # restore F25
- lfd f26, 96(r1) # restore F26
- lfd f27, 104(r1) # restore F27
- lfd f28, 112(r1) # restore F28
- lfd f29, 120(r1) # restore F29
- lfd f30, 128(r1) # restore F30
- lfd f31, 136(r1) # restore F31
- lfd f0, 144(r1) # load FPSCR
- mtfsf 0xff, f0 # restore FPSCR
+ lfd f14, 0(r1) ; restore F14
+ lfd f15, 8(r1) ; restore F15
+ lfd f16, 16(r1) ; restore F16
+ lfd f17, 24(r1) ; restore F17
+ lfd f18, 32(r1) ; restore F18
+ lfd f19, 40(r1) ; restore F19
+ lfd f20, 48(r1) ; restore F20
+ lfd f21, 56(r1) ; restore F21
+ lfd f22, 64(r1) ; restore F22
+ lfd f23, 72(r1) ; restore F23
+ lfd f24, 80(r1) ; restore F24
+ lfd f25, 88(r1) ; restore F25
+ lfd f26, 96(r1) ; restore F26
+ lfd f27, 104(r1) ; restore F27
+ lfd f28, 112(r1) ; restore F28
+ lfd f29, 120(r1) ; restore F29
+ lfd f30, 128(r1) ; restore F30
+ lfd f31, 136(r1) ; restore F31
+ lfd f0, 144(r1) ; load FPSCR
+ mtfsf 0xff, f0 ; restore FPSCR
- lwz r13, 152(r1) # restore R13
- lwz r14, 156(r1) # restore R14
- lwz r15, 160(r1) # restore R15
- lwz r16, 164(r1) # restore R16
- lwz r17, 168(r1) # restore R17
- lwz r18, 172(r1) # restore R18
- lwz r19, 176(r1) # restore R19
- lwz r20, 180(r1) # restore R20
- lwz r21, 184(r1) # restore R21
- lwz r22, 188(r1) # restore R22
- lwz r23, 192(r1) # restore R23
- lwz r24, 196(r1) # restore R24
- lwz r25, 200(r1) # restore R25
- lwz r26, 204(r1) # restore R26
- lwz r27, 208(r1) # restore R27
- lwz r28, 212(r1) # restore R28
- lwz r29, 216(r1) # restore R29
- lwz r30, 220(r1) # restore R30
- lwz r31, 224(r1) # restore R31
- lwz r3, 228(r1) # restore hidden
+ lwz r13, 152(r1) ; restore R13
+ lwz r14, 156(r1) ; restore R14
+ lwz r15, 160(r1) ; restore R15
+ lwz r16, 164(r1) ; restore R16
+ lwz r17, 168(r1) ; restore R17
+ lwz r18, 172(r1) ; restore R18
+ lwz r19, 176(r1) ; restore R19
+ lwz r20, 180(r1) ; restore R20
+ lwz r21, 184(r1) ; restore R21
+ lwz r22, 188(r1) ; restore R22
+ lwz r23, 192(r1) ; restore R23
+ lwz r24, 196(r1) ; restore R24
+ lwz r25, 200(r1) ; restore R25
+ lwz r26, 204(r1) ; restore R26
+ lwz r27, 208(r1) ; restore R27
+ lwz r28, 212(r1) ; restore R28
+ lwz r29, 216(r1) ; restore R29
+ lwz r30, 220(r1) ; restore R30
+ lwz r31, 224(r1) ; restore R31
+ lwz r3, 228(r1) ; restore hidden
- # restore CR
+ ; restore CR
lwz r0, 232(r1)
mtcr r0
- # restore LR
+ ; restore LR
lwz r0, 236(r1)
mtlr r0
- # load PC
+ ; load PC
lwz r0, 240(r1)
- # restore CTR
+ ; restore CTR
mtctr r0
- # adjust stack
+ ; adjust stack
addi r1, r1, 244
- # return transfer_t
+ ; return transfer_t
stw r6, 0(r3)
stw r5, 4(r3)
- # jump to context
+ ; jump to context
bctr
diff --git a/Zend/asm/jump_ppc64_sysv_macho_gas.S b/Zend/asm/jump_ppc64_sysv_macho_gas.S
index 74fcb2ab3528..dcc6c645db61 100644
--- a/Zend/asm/jump_ppc64_sysv_macho_gas.S
+++ b/Zend/asm/jump_ppc64_sysv_macho_gas.S
@@ -12,7 +12,7 @@
* ------------------------------------------------- *
* | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | *
* ------------------------------------------------- *
- * | TOC | R14 | R15 | R16 | *
+ * | R13 | R14 | R15 | R16 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
@@ -61,7 +61,7 @@
* ------------------------------------------------- *
* | 224 | 228 | 232 | 236 | 240 | 244 | 248 | 252 | *
* ------------------------------------------------- *
- * | TOC saved | FCTX | DATA | | *
+ * | FCTX | DATA | | | *
* ------------------------------------------------- *
* *
*******************************************************/
@@ -138,27 +138,27 @@ _jump_fcontext:
; load PC
ld r12, 176(r1)
- # restore CTR
+ ; restore CTR
mtctr r12
- # adjust stack
+ ; adjust stack
addi r1, r1, 184
- # zero in r3 indicates first jump to context-function
+ ; zero in r3 indicates first jump to context-function
cmpdi r3, 0
beq use_entry_arg
- # return transfer_t
+ ; return transfer_t
std r6, 0(r3)
std r5, 8(r3)
- # jump to context
+ ; jump to context
bctr
use_entry_arg:
- # copy transfer_t into transfer_fn arg registers
+ ; copy transfer_t into transfer_fn arg registers
mr r3, r6
mr r4, r5
- # jump to context
+ ; jump to context
bctr
diff --git a/Zend/asm/jump_x86_64_sysv_elf_gas.S b/Zend/asm/jump_x86_64_sysv_elf_gas.S
index c675c8c774c2..58f0e241d70f 100644
--- a/Zend/asm/jump_x86_64_sysv_elf_gas.S
+++ b/Zend/asm/jump_x86_64_sysv_elf_gas.S
@@ -12,20 +12,29 @@
* ---------------------------------------------------------------------------------- *
* | 0x0 | 0x4 | 0x8 | 0xc | 0x10 | 0x14 | 0x18 | 0x1c | *
* ---------------------------------------------------------------------------------- *
- * | fc_mxcsr|fc_x87_cw| R12 | R13 | R14 | *
+ * | fc_mxcsr|fc_x87_cw| guard | R12 | R13 | *
* ---------------------------------------------------------------------------------- *
* ---------------------------------------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ---------------------------------------------------------------------------------- *
* | 0x20 | 0x24 | 0x28 | 0x2c | 0x30 | 0x34 | 0x38 | 0x3c | *
* ---------------------------------------------------------------------------------- *
- * | R15 | RBX | RBP | RIP | *
+ * | R14 | R15 | RBX | RBP | *
+ * ---------------------------------------------------------------------------------- *
+ * ---------------------------------------------------------------------------------- *
+ * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
+ * ---------------------------------------------------------------------------------- *
+ * | 0x40 | 0x44 | | *
+ * ---------------------------------------------------------------------------------- *
+ * | RIP | | *
* ---------------------------------------------------------------------------------- *
* *
****************************************************************************************/
# if defined __CET__
# include <cet.h>
+# define SHSTK_ENABLED (__CET__ & 0x2)
+# define BOOST_CONTEXT_SHADOW_STACK (SHSTK_ENABLED && SHADOW_STACK_SYSCALL)
# else
# define _CET_ENDBR
# endif
@@ -36,19 +45,32 @@
.align 16
jump_fcontext:
_CET_ENDBR
- leaq -0x38(%rsp), %rsp /* prepare stack */
+ leaq -0x40(%rsp), %rsp /* prepare stack */
#if !defined(BOOST_USE_TSX)
stmxcsr (%rsp) /* save MMX control- and status-word */
fnstcw 0x4(%rsp) /* save x87 control-word */
#endif
- movq %r12, 0x8(%rsp) /* save R12 */
- movq %r13, 0x10(%rsp) /* save R13 */
- movq %r14, 0x18(%rsp) /* save R14 */
- movq %r15, 0x20(%rsp) /* save R15 */
- movq %rbx, 0x28(%rsp) /* save RBX */
- movq %rbp, 0x30(%rsp) /* save RBP */
+#if defined(BOOST_CONTEXT_TLS_STACK_PROTECTOR)
+ movq %fs:0x28, %rcx /* read stack guard from TLS record */
+ movq %rcx, 0x8(%rsp) /* save stack guard */
+#endif
+
+ movq %r12, 0x10(%rsp) /* save R12 */
+ movq %r13, 0x18(%rsp) /* save R13 */
+ movq %r14, 0x20(%rsp) /* save R14 */
+ movq %r15, 0x28(%rsp) /* save R15 */
+ movq %rbx, 0x30(%rsp) /* save RBX */
+ movq %rbp, 0x38(%rsp) /* save RBP */
+
+#if BOOST_CONTEXT_SHADOW_STACK
+ /* grow the stack to reserve space for shadow stack pointer(SSP) */
+ leaq -0x8(%rsp), %rsp
+ /* read the current SSP and store it */
+ rdsspq %rcx
+ movq %rcx, (%rsp)
+#endif
/* store RSP (pointing to context-data) in RAX */
movq %rsp, %rax
@@ -56,21 +78,44 @@ jump_fcontext:
/* restore RSP (pointing to context-data) from RDI */
movq %rdi, %rsp
- movq 0x38(%rsp), %r8 /* restore return-address */
+#if BOOST_CONTEXT_SHADOW_STACK
+ /* first 8 bytes are SSP */
+ movq (%rsp), %rcx
+ leaq 0x8(%rsp), %rsp
+
+ /* Restore target(new) shadow stack */
+ rstorssp -8(%rcx)
+ /* restore token for previous shadow stack is pushed */
+ /* on previous shadow stack after saveprevssp */
+ saveprevssp
+
+ /* when return, jump_fcontext jump to restored return address */
+ /* (r8) instead of RET. This miss of RET implies us to unwind */
+ /* shadow stack accordingly. Otherwise mismatch occur */
+ movq $1, %rcx
+ incsspq %rcx
+#endif
+
+ movq 0x40(%rsp), %r8 /* restore return-address */
#if !defined(BOOST_USE_TSX)
ldmxcsr (%rsp) /* restore MMX control- and status-word */
fldcw 0x4(%rsp) /* restore x87 control-word */
#endif
- movq 0x8(%rsp), %r12 /* restore R12 */
- movq 0x10(%rsp), %r13 /* restore R13 */
- movq 0x18(%rsp), %r14 /* restore R14 */
- movq 0x20(%rsp), %r15 /* restore R15 */
- movq 0x28(%rsp), %rbx /* restore RBX */
- movq 0x30(%rsp), %rbp /* restore RBP */
+#if defined(BOOST_CONTEXT_TLS_STACK_PROTECTOR)
+ movq 0x8(%rsp), %rdx /* load stack guard */
+ movq %rdx, %fs:0x28 /* restore stack guard to TLS record */
+#endif
+
+ movq 0x10(%rsp), %r12 /* restore R12 */
+ movq 0x18(%rsp), %r13 /* restore R13 */
+ movq 0x20(%rsp), %r14 /* restore R14 */
+ movq 0x28(%rsp), %r15 /* restore R15 */
+ movq 0x30(%rsp), %rbx /* restore RBX */
+ movq 0x38(%rsp), %rbp /* restore RBP */
- leaq 0x40(%rsp), %rsp /* prepare stack */
+ leaq 0x48(%rsp), %rsp /* prepare stack */
/* return transfer_t from jump */
#if !defined(_ILP32)
diff --git a/Zend/asm/make_i386_sysv_elf_gas.S b/Zend/asm/make_i386_sysv_elf_gas.S
index b76de260d211..9261e566c0d4 100644
--- a/Zend/asm/make_i386_sysv_elf_gas.S
+++ b/Zend/asm/make_i386_sysv_elf_gas.S
@@ -12,14 +12,14 @@
* ---------------------------------------------------------------------------------- *
* | 0x0 | 0x4 | 0x8 | 0xc | 0x10 | 0x14 | 0x18 | 0x1c | *
* ---------------------------------------------------------------------------------- *
- * | fc_mxcsr|fc_x87_cw| EDI | ESI | EBX | EBP | EIP | hidden | *
+ * | fc_mxcsr|fc_x87_cw| guard | EDI | ESI | EBX | EBP | EIP | *
* ---------------------------------------------------------------------------------- *
* ---------------------------------------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ---------------------------------------------------------------------------------- *
- * | 0x20 | 0x24 | | *
+ * | 0x20 | 0x24 | 0x28 | | *
* ---------------------------------------------------------------------------------- *
- * | to | data | | *
+ * | hidden | to | data | | *
* ---------------------------------------------------------------------------------- *
* *
****************************************************************************************/
@@ -40,23 +40,29 @@ make_fcontext:
/* shift address in EAX to lower 16 byte boundary */
andl $-16, %eax
- /* reserve space for context-data on context-stack */
- leal -0x28(%eax), %eax
+ /* reserve space for context-data on context-stack, and align the stack */
+ leal -0x34(%eax), %eax
/* third arg of make_fcontext() == address of context-function */
/* stored in EBX */
movl 0xc(%esp), %ecx
- movl %ecx, 0x10(%eax)
+ movl %ecx, 0x14(%eax)
/* save MMX control- and status-word */
stmxcsr (%eax)
/* save x87 control-word */
fnstcw 0x4(%eax)
+#if defined(BOOST_CONTEXT_TLS_STACK_PROTECTOR)
+ /* save stack guard */
+ movl %gs:0x14, %ecx /* read stack guard from TLS record */
+ movl %ecx, 0x8(%eax) /* save stack guard */
+#endif
+
/* return transport_t */
/* FCTX == EDI, DATA == ESI */
- leal 0x8(%eax), %ecx
- movl %ecx, 0x1c(%eax)
+ leal 0xc(%eax), %ecx
+ movl %ecx, 0x20(%eax)
/* compute abs address of label trampoline */
call 1f
@@ -66,7 +72,7 @@ make_fcontext:
addl $trampoline-1b, %ecx
/* save address of trampoline as return address */
/* will be entered after calling jump_fcontext() first time */
- movl %ecx, 0x18(%eax)
+ movl %ecx, 0x1c(%eax)
/* compute abs address of label finish */
call 2f
@@ -76,7 +82,7 @@ make_fcontext:
addl $finish-2b, %ecx
/* save address of finish as return-address for context-function */
/* will be entered after context-function returns */
- movl %ecx, 0x14(%eax)
+ movl %ecx, 0x18(%eax)
ret /* return pointer to context-data */
diff --git a/Zend/asm/make_i386_sysv_macho_gas.S b/Zend/asm/make_i386_sysv_macho_gas.S
index fdcdb7c80fbf..519e406248bb 100644
--- a/Zend/asm/make_i386_sysv_macho_gas.S
+++ b/Zend/asm/make_i386_sysv_macho_gas.S
@@ -38,8 +38,8 @@ _make_fcontext:
/* shift address in EAX to lower 16 byte boundary */
andl $-16, %eax
- /* reserve space for context-data on context-stack */
- leal -0x2c(%eax), %eax
+ /* reserve space for context-data on context-stack, and align the stack */
+ leal -0x34(%eax), %eax
/* third arg of make_fcontext() == address of context-function */
/* stored in EBX */
diff --git a/Zend/asm/make_ppc32_sysv_macho_gas.S b/Zend/asm/make_ppc32_sysv_macho_gas.S
index 8f35eff9abbf..1102ee90ef07 100644
--- a/Zend/asm/make_ppc32_sysv_macho_gas.S
+++ b/Zend/asm/make_ppc32_sysv_macho_gas.S
@@ -77,61 +77,78 @@
.globl _make_fcontext
.align 2
_make_fcontext:
- # save return address into R6
+ ; save return address into R6
mflr r6
- # first arg of make_fcontext() == top address of context-function
- # shift address in R3 to lower 16 byte boundary
+ ; first arg of make_fcontext() == top address of context-function
+ ; shift address in R3 to lower 16 byte boundary
clrrwi r3, r3, 4
- # reserve space for context-data on context-stack
- # including 64 byte of linkage + parameter area (R1 16 == 0)
+ ; reserve space for context-data on context-stack
+ ; including 64 byte of linkage + parameter area (R1 % 16 == 0)
subi r3, r3, 336
- # third arg of make_fcontext() == address of context-function
- stw r5, 240(r3)
+ ; third arg of make_fcontext() == address of context-function
+ ; store as trampoline's R31
+ stw r5, 224(r3)
- # set back-chain to zero
+ ; set back-chain to zero
li r0, 0
stw r0, 244(r3)
- mffs f0 # load FPSCR
- stfd f0, 144(r3) # save FPSCR
+ mffs f0 ; load FPSCR
+ stfd f0, 144(r3) ; save FPSCR
- # compute address of returned transfer_t
+ ; compute address of returned transfer_t
addi r0, r3, 252
mr r4, r0
stw r4, 228(r3)
- # load LR
+ ; load LR
mflr r0
- # jump to label 1
- bl 1f
-1:
- # load LR into R4
+ ; jump to label 1
+ bcl 20, 31, L1
+L1:
+ ; load LR into R4
mflr r4
- # compute abs address of label finish
- addi r4, r4, finish - 1b
- # restore LR
+ ; compute abs address of trampoline, use as PC
+ addi r5, r4, lo16(Ltrampoline - L1)
+ stw r5, 240(r3)
+ ; compute abs address of label finish
+ addi r4, r4, lo16(Lfinish - L1)
+ ; restore LR
mtlr r0
- # save address of finish as return-address for context-function
- # will be entered after context-function returns
+ ; save address of finish as return-address for context-function
+ ; will be entered after context-function returns
stw r4, 236(r3)
- # restore return address from R6
+ ; restore return address from R6
mtlr r6
- blr # return pointer to context-data
+ blr ; return pointer to context-data
-finish:
- # save return address into R0
- mflr r0
- # save return address on stack, set up stack frame
- stw r0, 4(r1)
- # allocate stack space, R1 16 == 0
- stwu r1, -16(r1)
+Ltrampoline:
+ ; We get R31 = context-function, R3 = address of transfer_t,
+ ; but we need to pass R3:R4 = transfer_t.
+ mtctr r31
+ lwz r4, 4(r3)
+ lwz r3, 0(r3)
+ bctr
- # exit code is zero
+Lfinish:
+ ; load address of _exit into CTR
+ bcl 20, 31, L2
+L2:
+ mflr r4
+ addis r4, r4, ha16(Lexitp - L2)
+ lwz r4, lo16(Lexitp - L2)(r4)
+ mtctr r4
+ ; exit code is zero
li r3, 0
- # exit application
- bl _exit@plt
+ ; exit application
+ bctr
+
+.const_data
+.align 2
+Lexitp:
+ .long __exit
diff --git a/Zend/asm/make_ppc64_sysv_macho_gas.S b/Zend/asm/make_ppc64_sysv_macho_gas.S
index 7b947bb6b030..fb5cada265a6 100644
--- a/Zend/asm/make_ppc64_sysv_macho_gas.S
+++ b/Zend/asm/make_ppc64_sysv_macho_gas.S
@@ -12,7 +12,7 @@
* ------------------------------------------------- *
* | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | *
* ------------------------------------------------- *
- * | TOC | R14 | R15 | R16 | *
+ * | R13 | R14 | R15 | R16 | *
* ------------------------------------------------- *
* ------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
@@ -61,7 +61,7 @@
* ------------------------------------------------- *
* | 224 | 228 | 232 | 236 | 240 | 244 | 248 | 252 | *
* ------------------------------------------------- *
- * | TOC saved | FCTX | DATA | | *
+ * | FCTX | DATA | | | *
* ------------------------------------------------- *
* *
@@ -77,19 +77,19 @@ _make_fcontext:
; reserve space for context-data on context-stack
; including 64 byte of linkage + parameter area (R1 16 == 0)
- subi r3, r3, 248
+ subi r3, r3, 240
; third arg of make_fcontext() == address of context-function
stw r5, 176(r3)
; set back-chain to zero
- li %r0, 0
- std %r0, 184(%r3)
+ li r0, 0
+ std r0, 184(r3)
; compute address of returned transfer_t
- addi %r0, %r3, 232
- mr %r4, %r0
- std %r4, 152(%r3)
+ addi r0, r3, 224
+ mr r4, r0
+ std r4, 152(r3)
; load LR
mflr r0
diff --git a/Zend/asm/make_x86_64_sysv_elf_gas.S b/Zend/asm/make_x86_64_sysv_elf_gas.S
index d422c6972df9..4294398a2edc 100644
--- a/Zend/asm/make_x86_64_sysv_elf_gas.S
+++ b/Zend/asm/make_x86_64_sysv_elf_gas.S
@@ -12,20 +12,29 @@
* ---------------------------------------------------------------------------------- *
* | 0x0 | 0x4 | 0x8 | 0xc | 0x10 | 0x14 | 0x18 | 0x1c | *
* ---------------------------------------------------------------------------------- *
- * | fc_mxcsr|fc_x87_cw| R12 | R13 | R14 | *
+ * | fc_mxcsr|fc_x87_cw| guard | R12 | R13 | *
* ---------------------------------------------------------------------------------- *
* ---------------------------------------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ---------------------------------------------------------------------------------- *
* | 0x20 | 0x24 | 0x28 | 0x2c | 0x30 | 0x34 | 0x38 | 0x3c | *
* ---------------------------------------------------------------------------------- *
- * | R15 | RBX | RBP | RIP | *
+ * | R14 | R15 | RBX | RBP | *
+ * ---------------------------------------------------------------------------------- *
+ * ---------------------------------------------------------------------------------- *
+ * | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | *
+ * ---------------------------------------------------------------------------------- *
+ * | 0x40 | 0x44 | | *
+ * ---------------------------------------------------------------------------------- *
+ * | RIP | | *
* ---------------------------------------------------------------------------------- *
* *
****************************************************************************************/
# if defined __CET__
# include <cet.h>
+# define SHSTK_ENABLED (__CET__ & 0x2)
+# define BOOST_CONTEXT_SHADOW_STACK (SHSTK_ENABLED && SHADOW_STACK_SYSCALL)
# else
# define _CET_ENDBR
# endif
@@ -36,6 +45,11 @@
.align 16
make_fcontext:
_CET_ENDBR
+#if BOOST_CONTEXT_SHADOW_STACK
+ /* the new shadow stack pointer (SSP) */
+ movq -0x8(%rdi), %r9
+#endif
+
/* first arg of make_fcontext() == top of context-stack */
movq %rdi, %rax
@@ -44,36 +58,79 @@ make_fcontext:
/* reserve space for context-data on context-stack */
/* on context-function entry: (RSP -0x8) % 16 == 0 */
- leaq -0x40(%rax), %rax
+ leaq -0x48(%rax), %rax
/* third arg of make_fcontext() == address of context-function */
/* stored in RBX */
- movq %rdx, 0x28(%rax)
+ movq %rdx, 0x30(%rax)
/* save MMX control- and status-word */
stmxcsr (%rax)
/* save x87 control-word */
fnstcw 0x4(%rax)
+#if defined(BOOST_CONTEXT_TLS_STACK_PROTECTOR)
+ /* save stack guard */
+ movq %fs:0x28, %rcx /* read stack guard from TLS record */
+ movq %rcx, 0x8(%rsp) /* save stack guard */
+#endif
+
/* compute abs address of label trampoline */
leaq trampoline(%rip), %rcx
/* save address of trampoline as return-address for context-function */
/* will be entered after calling jump_fcontext() first time */
- movq %rcx, 0x38(%rax)
+ movq %rcx, 0x40(%rax)
/* compute abs address of label finish */
leaq finish(%rip), %rcx
/* save address of finish as return-address for context-function */
/* will be entered after context-function returns */
- movq %rcx, 0x30(%rax)
+ movq %rcx, 0x38(%rax)
+
+#if BOOST_CONTEXT_SHADOW_STACK
+ /* Populate the shadow stack and normal stack */
+ /* get original SSP */
+ rdsspq %r8
+ /* restore new shadow stack */
+ rstorssp -0x8(%r9)
+ /* save the restore token on the original shadow stack */
+ saveprevssp
+ /* push the address of "jmp trampoline" to the new shadow stack */
+ /* as well as the stack */
+ call 1f
+ jmp trampoline
+1:
+ /* save address of "jmp trampoline" as return-address */
+ /* for context-function */
+ pop 0x38(%rax)
+ /* Get the new SSP. */
+ rdsspq %r9
+ /* restore original shadow stack */
+ rstorssp -0x8(%r8)
+ /* save the restore token on the new shadow stack. */
+ saveprevssp
+
+ /* reserve space for the new SSP */
+ leaq -0x8(%rax), %rax
+ /* save the new SSP to this fcontext */
+ movq %r9, (%rax)
+#endif
ret /* return pointer to context-data */
trampoline:
+ _CET_ENDBR
/* store return address on stack */
/* fix stack alignment */
- _CET_ENDBR
+#if BOOST_CONTEXT_SHADOW_STACK
+ /* save address of "jmp *%rbp" as return-address */
+ /* on stack and shadow stack */
+ call 2f
+ jmp *%rbp
+2:
+#else
push %rbp
+#endif
/* jump to context-function */
jmp *%rbx
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