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fix x87 register layout

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This commit is contained in:
Nikita Smith
2025-12-05 16:36:46 -08:00
parent f4ceaecf75
commit ce77442d37
13 changed files with 404 additions and 655 deletions
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src/demon/linux/demon_core_linux.c
+15 -11
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@@ -1038,10 +1038,10 @@ dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread)
// copy x87 registers
dst->fcw.u16 = src->fcw;
dst->fsw.u16 = src->fsw;
dst->ftw.u16 = x64_xsave_tag_word_from_real_tag_word(src->ftw);
dst->ftw = src->ftw;
dst->fop.u16 = src->fop;
dst->fip.u64 = src->b64.fip;
dst->fdp.u64 = src->b64.fdp;
dst->fip.u64 = src->fip;
dst->fdp.u64 = src->fdp;
dst->mxcsr.u32 = src->mxcsr;
dst->mxcsr_mask.u32 = src->mxcsr_mask;
for EachIndex(i, 8)
@@ -1063,6 +1063,9 @@ dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread)
// copy xsave registers
if(xsave)
{
// compact register layout is not supported
AssertAlways(xsave->header.xcomp_bv == 0);
if(xsave->header.xstate_bv & X64_XStateComponentFlag_AVX)
{
AssertAlways(process->xsave_layout.avx_offset + 16*sizeof(REGS_Reg128) <= process->xsave_size);
@@ -1219,14 +1222,14 @@ dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
X64_FXSave dst_fxsave = {0};
{
dst_fxsave.fcw = src->fcw.u16;
dst_fxsave.fsw = src->fsw.u16;
dst_fxsave.ftw = src->ftw.u16;
dst_fxsave.fop = src->fop.u16;
dst_fxsave.b64.fip = src->fip.u64;
dst_fxsave.b64.fdp = src->fdp.u64;
dst_fxsave.mxcsr = src->mxcsr.u32;
dst_fxsave.mxcsr_mask = src->mxcsr_mask.u32;
dst_fxsave.fcw = src->fcw.u16;
dst_fxsave.fsw = src->fsw.u16;
dst_fxsave.ftw = src->ftw;
dst_fxsave.fop = src->fop.u16;
dst_fxsave.fip = src->fip.u64;
dst_fxsave.fdp = src->fdp.u64;
dst_fxsave.mxcsr = src->mxcsr.u32;
dst_fxsave.mxcsr_mask = src->mxcsr_mask.u32;
REGS_Reg128 *st_d = (REGS_Reg128 *)dst_fxsave.st_space;
REGS_Reg80 *st_s = &src->st0;
@@ -1248,6 +1251,7 @@ dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
U8 *xsave_raw = push_array(scratch.arena, U8, process->xsave_size);
X64_XSave *dst = (X64_XSave *)xsave_raw;
dst->fxsave = dst_fxsave;
dst->header.xstate_bv |= X64_XStateComponentFlag_FP;
dst->header.xstate_bv |= X64_XStateComponentFlag_SSE;
if(process->xsave_layout.avx_offset)