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RISC-V: Give error for RVE PLTs.

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bfd/
	* elfnn-riscv.c (riscv_make_plt_header): New arg output_bfd.  Change
	return type to bfd_boolean.  If	EF_RISCV_RVE call _bfd_error_handler
	and return FALSE.  Return TRUE at end.
	(riscv_make_plt_entry): Likewise.
	(riscv_elf_finish_dynamic_symbol): Update call to riscv_make_plt_entry.
	(riscv_elf_finish_dynamic_sections): Update call to
	riscv_make_plt_header.
This commit is contained in:
Jim Wilson 2018-09-25 13:13:23 -07:00
parent 3d6e0c015a
commit 5ef2379329
2 changed files with 46 additions and 8 deletions
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10
bfd/ChangeLog
View File

@ -1,3 +1,13 @@
2018-09-25 Jim Wilson <jimw@sifive.com>
* elfnn-riscv.c (riscv_make_plt_header): New arg output_bfd. Change
return type to bfd_boolean. If EF_RISCV_RVE call _bfd_error_handler
and return FALSE. Return TRUE at end.
(riscv_make_plt_entry): Likewise.
(riscv_elf_finish_dynamic_symbol): Update call to riscv_make_plt_entry.
(riscv_elf_finish_dynamic_sections): Update call to
riscv_make_plt_header.
2018-09-24 Jim Wilson <jimw@sifive.com>
* elfnn-riscv.c (_bfd_riscv_relax_pc) <R_RISCV_PCREL_LO12_I>: New local

44
bfd/elfnn-riscv.c
View File

@ -169,12 +169,21 @@ riscv_elf_got_plt_val (bfd_vma plt_index, struct bfd_link_info *info)
/* Generate a PLT header. */
static void
riscv_make_plt_header (bfd_vma gotplt_addr, bfd_vma addr, uint32_t *entry)
static bfd_boolean
riscv_make_plt_header (bfd *output_bfd, bfd_vma gotplt_addr, bfd_vma addr,
uint32_t *entry)
{
bfd_vma gotplt_offset_high = RISCV_PCREL_HIGH_PART (gotplt_addr, addr);
bfd_vma gotplt_offset_low = RISCV_PCREL_LOW_PART (gotplt_addr, addr);
/* RVE has no t3 register, so this won't work, and is not supported. */
if (elf_elfheader (output_bfd)->e_flags & EF_RISCV_RVE)
{
_bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"),
output_bfd);
return FALSE;
}
/* auipc t2, %hi(.got.plt)
sub t1, t1, t3 # shifted .got.plt offset + hdr size + 12
l[w|d] t3, %lo(.got.plt)(t2) # _dl_runtime_resolve
@ -192,13 +201,24 @@ riscv_make_plt_header (bfd_vma gotplt_addr, bfd_vma addr, uint32_t *entry)
entry[5] = RISCV_ITYPE (SRLI, X_T1, X_T1, 4 - RISCV_ELF_LOG_WORD_BYTES);
entry[6] = RISCV_ITYPE (LREG, X_T0, X_T0, RISCV_ELF_WORD_BYTES);
entry[7] = RISCV_ITYPE (JALR, 0, X_T3, 0);
return TRUE;
}
/* Generate a PLT entry. */
static void
riscv_make_plt_entry (bfd_vma got, bfd_vma addr, uint32_t *entry)
static bfd_boolean
riscv_make_plt_entry (bfd *output_bfd, bfd_vma got, bfd_vma addr,
uint32_t *entry)
{
/* RVE has no t3 register, so this won't work, and is not supported. */
if (elf_elfheader (output_bfd)->e_flags & EF_RISCV_RVE)
{
_bfd_error_handler (_("%pB: warning: RVE PLT generation not supported"),
output_bfd);
return FALSE;
}
/* auipc t3, %hi(.got.plt entry)
l[w|d] t3, %lo(.got.plt entry)(t3)
jalr t1, t3
@ -208,6 +228,8 @@ riscv_make_plt_entry (bfd_vma got, bfd_vma addr, uint32_t *entry)
entry[1] = RISCV_ITYPE (LREG, X_T3, X_T3, RISCV_PCREL_LOW_PART (got, addr));
entry[2] = RISCV_ITYPE (JALR, X_T1, X_T3, 0);
entry[3] = RISCV_NOP;
return TRUE;
}
/* Create an entry in an RISC-V ELF linker hash table. */
@ -2353,8 +2375,11 @@ riscv_elf_finish_dynamic_symbol (bfd *output_bfd,
loc = htab->elf.splt->contents + h->plt.offset;
/* Fill in the PLT entry itself. */
riscv_make_plt_entry (got_address, header_address + h->plt.offset,
plt_entry);
if (! riscv_make_plt_entry (output_bfd, got_address,
header_address + h->plt.offset,
plt_entry))
return FALSE;
for (i = 0; i < PLT_ENTRY_INSNS; i++)
bfd_put_32 (output_bfd, plt_entry[i], loc + 4*i);
@ -2529,8 +2554,11 @@ riscv_elf_finish_dynamic_sections (bfd *output_bfd,
{
int i;
uint32_t plt_header[PLT_HEADER_INSNS];
riscv_make_plt_header (sec_addr (htab->elf.sgotplt),
sec_addr (splt), plt_header);
ret = riscv_make_plt_header (output_bfd,
sec_addr (htab->elf.sgotplt),
sec_addr (splt), plt_header);
if (!ret)
return ret;
for (i = 0; i < PLT_HEADER_INSNS; i++)
bfd_put_32 (output_bfd, plt_header[i], splt->contents + 4*i);