[PATCH v2 1/2] [pr gdb/19447] sim: mips: Only truncate sign extension bits for 32-bit target models

[Faraz Shahbazker]

64-bit BFD for MIPS applies a standard sign extension on all addresses
assuming 64-bit target.  These bits are required for 64-bit and can only
be safely truncated for 32-bit target models. This partially reverts commit
b36d953bced0a4fecdde1823abac70ed7038ee95

The sign-extension logic modeled by BFD is an integral part of the
MIPS64 architecture spec. It appears in the virtual address map, where
sign extension allows for 32-bit compatibility segments [1] with 64-bit
addressing. Truncating these addresses prematurely (commit
models (-DWITH_TARGET_WORD_BITSIZE=64).

In the ISA itself, direct addressing (Load-Upper-Immediate) and indirect
addressing (Load-Word) both automatically sign-extend their results. These
instructions regenerate the sign-extended addresses even if we don't start
with one (see pr gdb/19447).

Moreover, some instructions like ADD*/SUB* have unpredictable behaviour when
an operand is not correctly sign extended [3]. This affects PC-relative
addressing in particular, so arithmetic on the link-address generated in the
return address register by a jump-and-link is no longer possible, neither is
the use of the PC-relative addressing instructions provided by MIPSR6.

[1] "MIPS64 Architecture for Programmers Volume III: The MIPS64
    Privileged Resource Architecture", Document Number: MD00091,
    Revision 6.02, December 10, 2015, Section 4.3 "Virtual Address
    Spaces", pp. 29-31
https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00091-2B-MIPS64PRA-AFP-06.03.pdf

[2] "MIPS64 Architecture for Programmers Volume II-A: The MIPS64
    Instruction Set Reference Manual", Document Number: MD00087,
    Revision 6.06, December 15, 2016, Section 3.2 "Alphabetical
    List of Instructions", pp. 321
https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00087-2B-MIPS64BIS-AFP-6.06.pdf

[3] "MIPS64 Architecture for Programmers Volume II-A: The MIPS64
    Instruction Set Reference Manual", Document Number: MD00087,
    Revision 6.06, December 15, 2016, Section 3.2 "Alphabetical
    List of Instructions", pp. 56
https://s3-eu-west-1.amazonaws.com/downloads-mips/documents/MD00087-2B-MIPS64BIS-AFP-6.06.pdf

2021-04-23  Faraz Shahbazker  <fshahbazker@wavecomp.com>

sim/mips/ChangeLog:
	* interp.c (sim_create_inferior): Only truncate sign extension
	bits for 32-bit target models.
---
 sim/mips/interp.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/sim/mips/interp.c b/sim/mips/interp.c
index 2839715959c..6e00fd0dbf0 100644
--- a/sim/mips/interp.c
+++ b/sim/mips/interp.c
@@ -1014,12 +1014,11 @@ sim_create_inferior (SIM_DESC sd, struct bfd *abfd,
 	  sim_cpu *cpu = STATE_CPU (sd, cpu_nr);
 	  sim_cia pc = bfd_get_start_address (abfd);
 
-	  /* We need to undo brain-dead bfd behavior where it sign-extends
-	     addresses that are supposed to be unsigned.  See the mips bfd
-	     sign_extend_vma setting.  We have to check the ELF data itself
-	     in order to handle o32 & n32 ABIs.  */
-	  if (abfd->tdata.elf_obj_data->elf_header->e_ident[EI_CLASS] ==
-	      ELFCLASS32)
+	  /* The 64-bit BFD sign-extends MIPS addresses to model
+	     32-bit compatibility segments with 64-bit addressing.
+	     These addresses work as is on 64-bit targets but
+	     can be truncated for 32-bit targets.  */
+	  if (WITH_TARGET_WORD_BITSIZE == 32)
 	    pc = (unsigned32) pc;
 
 	  CPU_PC_SET (cpu, pc);
-- 
2.25.1