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aarch64: implement the trampoline table workaround for ffi closures on Apple systems

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This is a direct copy/paste port of the ARM code, with changes because of Aarch64 pc-relative addressing restrictions.
This commit is contained in:
Yavor Georgiev
2015-01-16 15:31:55 +02:00
parent 05e65b4e20
commit 536366349c
4 changed files with 283 additions and 16 deletions
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src/aarch64/sysv.S
+21 -2
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@@ -248,8 +248,8 @@ CNAME(ffi_closure_SYSV):
stp x6, x7, [sp, #16 + 16*N_V_ARG_REG + 48]
/* Load ffi_closure_inner arguments. */
ldp x0, x1, [x17, #FFI_TRAMPOLINE_SIZE] /* load cif, fn */
ldr x2, [x17, #FFI_TRAMPOLINE_SIZE+16] /* load user_data */
ldp x0, x1, [x17, #FFI_TRAMPOLINE_CLOSURE_OFFSET] /* load cif, fn */
ldr x2, [x17, #FFI_TRAMPOLINE_CLOSURE_OFFSET+16] /* load user_data */
.Ldo_closure:
add x3, sp, #16 /* load context */
add x4, sp, #ffi_closure_SYSV_FS /* load stack */
@@ -343,6 +343,25 @@ CNAME(ffi_closure_SYSV):
.size CNAME(ffi_closure_SYSV), . - CNAME(ffi_closure_SYSV)
#endif
#if FFI_EXEC_TRAMPOLINE_TABLE
.align 12
CNAME(ffi_closure_trampoline_table_page):
.rept 16384 / FFI_TRAMPOLINE_SIZE
adr x17, -16384
adr x16, -16380
ldr x16, [x16]
ldr x17, [x17]
br x16
.endr
.globl CNAME(ffi_closure_trampoline_table_page)
#ifdef __ELF__
.type CNAME(ffi_closure_trampoline_table_page), #function
.hidden CNAME(ffi_closure_trampoline_table_page)
.size CNAME(ffi_closure_trampoline_table_page), . - CNAME(ffi_closure_trampoline_table_page)
#endif
#endif
#ifdef FFI_GO_CLOSURES
.align 4
CNAME(ffi_go_closure_SYSV_V):