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Compiler generates the following instruction sequence for dynamic TLS access: leal tls_var@tlsgd(,%ebx,1), %eax call ___tls_get_addr@PLT CALL instruction is transparent to compiler which assumes all registers, except for EFLAGS, AX, CX, and DX, are unchanged after CALL. But ___tls_get_addr is a normal function which doesn't preserve any vector registers. 1. Rename the generic __tls_get_addr function to ___tls_get_addr_internal. 2. Change ___tls_get_addr to a wrapper function with implementations for FNSAVE, FXSAVE, XSAVE and XSAVEC to save and restore all vector registers. 3. dl-tlsdesc-dynamic.h has: _dl_tlsdesc_dynamic: /* Like all TLS resolvers, preserve call-clobbered registers. We need two scratch regs anyway. */ subl $32, %esp cfi_adjust_cfa_offset (32) It is wrong to use movl %ebx, -28(%esp) movl %esp, %ebx cfi_def_cfa_register(%ebx) ... mov %ebx, %esp cfi_def_cfa_register(%esp) movl -28(%esp), %ebx to preserve EBX on stack. Fix it with: movl %ebx, 28(%esp) movl %esp, %ebx cfi_def_cfa_register(%ebx) ... mov %ebx, %esp cfi_def_cfa_register(%esp) movl 28(%esp), %ebx 4. Update _dl_tlsdesc_dynamic to call ___tls_get_addr_internal directly. 5. Add have-test-mtls-traditional to compile tst-tls23-mod.c with traditional TLS variant to verify the fix. 6. Define DL_RUNTIME_RESOLVE_REALIGN_STACK in sysdeps/x86/sysdep.h. This fixes BZ #32996. Co-Authored-By: Adhemerval Zanella <adhemerval.zanella@linaro.org> Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
52 lines
1.2 KiB
Plaintext
52 lines
1.2 KiB
Plaintext
# This file is generated from configure.ac by Autoconf. DO NOT EDIT!
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# Local preconfigure fragment for sysdeps/loongarch
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case "$machine" in
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loongarch*)
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abi=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __loongarch_\(lp64\|ilp32\).*/\1/p'`
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float_abi=`$CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null | sed -n 's/^#define __loongarch_\(soft\|single\|double\)_float.*/\1/p'`
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with_fp_cond="!defined __loongarch_soft_float"
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case "$float_abi" in
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soft)
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abi_flen=0
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;;
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single)
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as_fn_error 1 "glibc does not yet support the single floating-point ABI!!" "$LINENO" 5
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;;
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double)
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abi_flen=64
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;;
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*)
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as_fn_error 1 "Unable to determine floating-point ABI!!" "$LINENO" 5
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;;
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esac
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case "$abi" in
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ilp32)
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as_fn_error 1 "loongarch does not yet support ilp32 ABI!!" "$LINENO" 5
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;;
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lp64)
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grlen=64
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machine=loongarch/lp64
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;;
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*)
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as_fn_error 1 "Unable to determine GRLEN!!" "$LINENO" 5
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;;
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esac
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printf "%s\n" "#define LOONGARCH_ABI_GRLEN $grlen" >>confdefs.h
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printf "%s\n" "#define LOONGARCH_ABI_FRLEN $abi_flen" >>confdefs.h
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base_machine=loongarch
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mtls_descriptor=desc
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mtls_traditional=trad
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;;
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esac
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