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set flags in xstate_bv for updated registers

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This commit is contained in:
Nikita Smith
2025-12-05 13:35:10 -08:00
parent 38dbcde3f4
commit f4ceaecf75
1 changed files with 9 additions and 5 deletions
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src/demon/linux/demon_core_linux.c
+9 -5
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@@ -1245,12 +1245,10 @@ dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
if(x64_is_xsave_supported())
{
U8 *xsave_raw = push_array(scratch.arena, U8, process->xsave_size);
int xsave_get = OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_GETREGSET, tid, (void *)NT_PRSTATUS, &(struct iovec){ .iov_base = xsave_raw, .iov_len = process->xsave_size }));
AssertAlways(xsave_get >= 0);
X64_XSave *dst = (X64_XSave *)xsave_raw;
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_SSE;
if(process->xsave_layout.avx_offset)
{
@@ -1262,6 +1260,7 @@ dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
{
MemoryCopy(&avx_d[n], &zmm_s[n].v[16], sizeof(REGS_Reg128));
}
dst->header.xstate_bv |= X64_XStateComponentFlag_AVX;
}
}
@@ -1275,6 +1274,7 @@ dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
{
MemoryCopy(&kmask_d[n], &kmask_s[n], sizeof(REGS_Reg64));
}
dst->header.xstate_bv |= X64_XStateComponentFlag_OPMASK;
}
else { Assert(0 && "invalid xsave size"); }
}
@@ -1289,6 +1289,7 @@ dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
{
MemoryCopy(&avx512h_d[n], &zmmh_s[n].v[32], sizeof(REGS_Reg256));
}
dst->header.xstate_bv |= X64_XStateComponentFlag_ZMM_H;
}
else { Assert(0 && "invalid xsave size"); }
}
@@ -1303,6 +1304,7 @@ dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
{
MemoryCopy(&avx512_d[n], &zmm_s[n], sizeof(REGS_Reg512));
}
dst->header.xstate_bv |= X64_XStateComponentFlag_ZMM;
}
else { Assert(0 && "invalid xsave size"); }
}
@@ -1314,11 +1316,13 @@ dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread)
REGS_Reg64 *cet_u = (REGS_Reg64 *)(xsave_raw + process->xsave_layout.cet_u_offset);
cet_u[0] = src->cetmsr;
cet_u[1] = src->cetssp;
dst->header.xstate_bv |= X64_XStateComponentFlag_CETU;
}
else { Assert(0 && "invalid xsave size"); }
}
// xsave
Assert(dst->header.xcomp_bv == 0); // must always be zero
xsave_result = OS_LNX_RETRY_ON_EINTR(ptrace(PTRACE_SETREGSET, tid, (void *)NT_X86_XSTATE, &(struct iovec){ .iov_base = dst, .iov_len = process->xsave_size }));
Assert(xsave_result >= 0);
}