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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>
23 lines
703 B
C
23 lines
703 B
C
#ifndef __x86_64__
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#include <sys/platform/x86.h>
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#define IS_SUPPORTED() CPU_FEATURE_ACTIVE (SSE2)
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#endif
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/* Set XMM0...XMM7 to all 1s. */
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#define PREPARE_MALLOC() \
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{ \
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asm volatile ("pcmpeqd %%xmm0, %%xmm0" : : : "xmm0" ); \
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asm volatile ("pcmpeqd %%xmm1, %%xmm1" : : : "xmm1" ); \
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asm volatile ("pcmpeqd %%xmm2, %%xmm2" : : : "xmm2" ); \
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asm volatile ("pcmpeqd %%xmm3, %%xmm3" : : : "xmm3" ); \
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asm volatile ("pcmpeqd %%xmm4, %%xmm4" : : : "xmm4" ); \
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asm volatile ("pcmpeqd %%xmm5, %%xmm5" : : : "xmm5" ); \
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asm volatile ("pcmpeqd %%xmm6, %%xmm6" : : : "xmm6" ); \
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asm volatile ("pcmpeqd %%xmm7, %%xmm7" : : : "xmm7" ); \
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}
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#include <elf/tst-tls23.c>
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v2di v1, v2, v3;
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