b287eca391
There are extensions to 386 psABI: https://groups.google.com/forum/#!topic/ia32-abi/awsRSvJOJfs to call tls_get_addr via GOT: call *___tls_get_addr@GOT(%reg) where EBX register isn't required as GOT base. Since direct call is 4-byte long and indirect call, is 5-byte long, the extra one byte must be handled properly. For general dynamic model, 7-byte lea instruction before call instruction is replaced by 6-byte one to make room for indirect call. For local dynamic model, we simply use 5-byte indirect call. TLS linker optimization is updated to recognize new instruction patterns. For local dynamic model to local exec model transition, we generate a 6-byte lea instruction as nop, instead of a 1-byte nop plus a 4-byte lea instruction. PR gold/20308 * i386.cc (Target_i386::Relocate::relocate): Allow R_386_GOT32X relocation against ___tls_get_addr. (Target_i386::Relocate::tls_gd_to_ie): Support indirect call to __tls_get_addr. (Target_i386::Relocate::tls_gd_to_le): Likewise. (Target_i386::Relocate::tls_ld_to_le): Likewise. * testsuite/Makefile.am (check_PROGRAMS): Add pr20308a_test, pr20308b_test, pr20308c_test, pr20308d_test, pr20308e_test. (pr20308a_test_SOURCES): New. (pr20308a_test_DEPENDENCIES): Likewise. (pr20308a_test_CFLAGS): Likewise. (pr20308a_test_LDFLAGS): Likewise. (pr20308a_test_LDADD): Likewise. (pr20308b_test_SOURCES): Likewise. (pr20308b_test_DEPENDENCIES): Likewise. (pr20308b_test_CFLAGS): Likewise. (pr20308b_test_LDFLAGS): Likewise. (pr20308b_test_LDADD): Likewise. (pr20308c_test_SOURCES): Likewise. (pr20308c_test_DEPENDENCIES): Likewise. (pr20308c_test_CFLAGS): Likewise. (pr20308c_test_LDFLAGS): Likewise. (pr20308c_test_LDADD): Likewise. (pr20308d_test_SOURCES): Likewise. (pr20308d_test_DEPENDENCIES): Likewise. (pr20308d_test_CFLAGS): Likewise. (pr20308d_test_LDFLAGS): Likewise. (pr20308d_test_LDADD): Likewise. (pr20308e_test_SOURCES): Likewise. (pr20308e_test_DEPENDENCIES): Likewise. (pr20308e_test_CFLAGS): Likewise. (pr20308e_test_LDFLAGS): Likewise. (pr20308e_test_LDADD): Likewise. (pr20308a.so): Likewise. (pr20308b.so): Likewise. (pr20308_gd.o): Likewise. (pr20308_ld.o): Likewise. (MOSTLYCLEANFILES): Add pr20308a.so pr20308b.so. * testsuite/Makefile.in: Regenerated. * testsuite/pr20308_def.c: New file. * testsuite/pr20308_gd.S: Likewise. * testsuite/pr20308_ld.S: Likewise. * testsuite/pr20308_main.c: Likewise.
65 lines
1.4 KiB
ArmAsm
65 lines
1.4 KiB
ArmAsm
.text
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.p2align 4,,15
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.globl get_gd
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.type get_gd, @function
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get_gd:
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pushl %ebx
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call __x86.get_pc_thunk.bx
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addl $_GLOBAL_OFFSET_TABLE_, %ebx
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subl $8, %esp
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leal gd@tlsgd(,%ebx,1), %eax
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call ___tls_get_addr@PLT
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addl $8, %esp
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popl %ebx
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ret
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.size get_gd, .-get_gd
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.p2align 4,,15
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.globl set_gd
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.type set_gd, @function
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set_gd:
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pushl %ebx
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call __x86.get_pc_thunk.bx
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addl $_GLOBAL_OFFSET_TABLE_, %ebx
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subl $8, %esp
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leal gd@tlsgd(%ebx), %eax
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call ___tls_get_addr@PLT
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nop
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movl 16(%esp), %edx
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movl %edx, (%eax)
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addl $8, %esp
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popl %ebx
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ret
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.size set_gd, .-set_gd
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.text
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.p2align 4,,15
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.globl test_gd
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.type test_gd, @function
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test_gd:
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call __x86.get_pc_thunk.cx
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addl $_GLOBAL_OFFSET_TABLE_, %ecx
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subl $12, %esp
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leal gd@tlsgd(%ecx), %eax
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call *___tls_get_addr@GOT(%ecx)
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movl 16(%esp), %ecx
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cmpl %ecx, (%eax)
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sete %al
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addl $12, %esp
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movzbl %al, %eax
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ret
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.size test_gd, .-test_gd
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.section .text.unlikely
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.section .text.__x86.get_pc_thunk.bx,"axG",@progbits,__x86.get_pc_thunk.bx,comdat
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.globl __x86.get_pc_thunk.bx
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.hidden __x86.get_pc_thunk.bx
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.type __x86.get_pc_thunk.bx, @function
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__x86.get_pc_thunk.bx:
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movl (%esp), %ebx
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ret
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.section .text.__x86.get_pc_thunk.cx,"axG",@progbits,__x86.get_pc_thunk.cx,comdat
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.globl __x86.get_pc_thunk.cx
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.hidden __x86.get_pc_thunk.cx
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.type __x86.get_pc_thunk.cx, @function
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__x86.get_pc_thunk.cx:
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movl (%esp), %ecx
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ret
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.section .note.GNU-stack,"",@progbits
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