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ircd: Update x86_64 jump_fcontext stack offset. (boost-1.81)

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This commit is contained in:
Jason Volk 2023-01-17 18:56:51 -08:00
parent c0a6ce7ee2
commit c667987391
2 changed files with 20 additions and 7 deletions
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2
ircd/Makefile.am
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@ -278,7 +278,7 @@ if OPENCL
cl.lo: AM_CPPFLAGS := @OPENCL_CPPFLAGS@ ${AM_CPPFLAGS}
endif
client.lo: AM_CPPFLAGS := ${AM_CPPFLAGS} ${ASIO_UNIT_CPPFLAGS}
ctx_x86_64.lo: AM_CPPFLAGS := -I$(top_srcdir)/include
ctx_x86_64.lo: AM_CPPFLAGS := -I$(top_srcdir)/include ${BOOST_CPPFLAGS}
ctx.lo: AM_CPPFLAGS := ${AM_CPPFLAGS} ${ASIO_UNIT_CPPFLAGS}
ctx_ole.lo: AM_CPPFLAGS := ${AM_CPPFLAGS} ${ASIO_UNIT_CPPFLAGS}
ctx_eh.lo: AM_CPPFLAGS := ${AM_CPPFLAGS} ${ASIO_UNIT_CPPFLAGS}

25
ircd/ctx_x86_64.S
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@ -13,11 +13,24 @@
//
#include <ircd/config.h>
#include <boost/version.hpp>
#if defined(__x86_64__) && defined(__ELF__)
.file "ctx_x86_64.S"
.globl jump_fcontext
// Sizes of additional items saved on context switch
.equiv x87_ctrl_sz, 0x04
.equiv mmx_ctrl_sz, 0x04
.equiv stack_prot_sz, 0x08
// Total size of all additional items
.if BOOST_VERSION >= 108100
.equiv alloc_sz, x87_ctrl_sz + mmx_ctrl_sz + stack_prot_sz
.else
.equiv alloc_sz, x87_ctrl_sz + mmx_ctrl_sz
.endif
.text
.type jump_fcontext, @function
@ -32,15 +45,15 @@ jump_fcontext:
push %r14 // store r14 0x18
push %r13 // store r13 0x10
push %r12 // store r12 0x08
subq $0x08, %rsp // alloc fc_mxcsr | fc_x87_cw
// fnstcw 0x04(%rsp) // store x87 control-word
// stmxcsr 0x00(%rsp) // store MMX control- and status-word
subq $alloc_sz, %rsp // additional allocation
fnstcw 0x04(%rsp) // store x87 control-word
stmxcsr 0x00(%rsp) // store MMX control- and status-word
xchgq %rsp, %rdi // swap stack
movq %rsi, %rdx // store transfer_t.data (retval)
movq %rdi, %rax // store transfer_t.fctx (retval)
// ldmxcsr 0x00(%rsp) // load MMX control- and status-word
// fldcw 0x04(%rsp) // load x87 control-word
addq $0x08, %rsp // free fc_mxcsr | fc_x87_cw
ldmxcsr 0x00(%rsp) // load MMX control- and status-word
fldcw 0x04(%rsp) // load x87 control-word
addq $alloc_sz, %rsp // free allocation
pop %r12 // load r12 <-- LLd miss
pop %r13 // load r13
pop %r14 // load r14