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cmd/link: support PIE mode with internal link on linux arm64

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This CL improves internal link to provide basic support for cgo and PIE:
1, add support for GOT, PLT and GOTPLT.
2, add support for following ELF relocation types which have been used by std
   packages:
     R_AARCH64_ADR_GOT_PAGE
     R_AARCH64_LD64_GOT_LO12_NC
     R_AARCH64_ADR_PREL_PG_HI21
     R_AARCH64_ADD_ABS_LO12_NC
     R_AARCH64_LDST8_ABS_LO12_NC
     R_AARCH64_LDST32_ABS_LO12_NC
     R_AARCH64_LDST64_ABS_LO12_NC
     R_AARCH64_JUMP26
     R_AARCH64_ABS64
     R_AARCH64_PREL32
     R_AARCH64_PREL64

With this change, Go toolchain can be built in internal linking mode, and
pure Go programs can be built with PIE mode in internal linking mode on arm64.

Updates #10373
The prototype of this CL is contributed by Wei Xiao <wei.xiao@arm.com>

Change-Id: I2253923c69e855fd1524d54def309a961dce6247
Reviewed-on: https://go-review.googlesource.com/c/go/+/163579
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
erifan01 2018-09-26 10:12:18 +00:00 • committed by Cherry Zhang
parent d2c12634de
commit d2765de863
7 changed files with 521 additions and 83 deletions
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2
src/cmd/link/internal/ld/lib.go
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@ -2492,7 +2492,7 @@ func (ctxt *Link) callgraph() {
if r.Sym == nil {
continue
}
if (r.Type == objabi.R_CALL || r.Type == objabi.R_CALLARM || r.Type == objabi.R_CALLPOWER || r.Type == objabi.R_CALLMIPS) && r.Sym.Type == sym.STEXT {
if (r.Type == objabi.R_CALL || r.Type == objabi.R_CALLARM || r.Type == objabi.R_CALLARM64 || r.Type == objabi.R_CALLPOWER || r.Type == objabi.R_CALLMIPS) && r.Sym.Type == sym.STEXT {
ctxt.Logf("%s calls %s\n", s.Name, r.Sym.Name)
}
}