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183 lines
6.4 KiB
183 lines
6.4 KiB
3 years ago
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commit 14041afe24556efd5845564aa183b6451fd9d6cc
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Author: law <law@138bc75d-0d04-0410-961f-82ee72b054a4>
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Date: Thu Feb 1 16:22:56 2018 +0000
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PR target/84128
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* config/i386/i386.c (release_scratch_register_on_entry): Add new
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OFFSET and RELEASE_VIA_POP arguments. Use SP+OFFSET to restore
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the scratch if RELEASE_VIA_POP is false.
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(ix86_adjust_stack_and_probe_stack_clash): Un-constify SIZE.
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If we have to save a temporary register, decrement SIZE appropriately.
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Pass new arguments to release_scratch_register_on_entry.
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(ix86_adjust_stack_and_probe): Likewise.
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(ix86_emit_probe_stack_range): Pass new arguments to
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release_scratch_register_on_entry.
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PR target/84128
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* gcc.target/i386/pr84128.c: New test.
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diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
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index 2fe2a0c..c25d26c 100644
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--- a/gcc/config/i386/i386.c
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+++ b/gcc/config/i386/i386.c
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@@ -10182,22 +10182,39 @@ get_scratch_register_on_entry (struct scratch_reg *sr)
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}
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}
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-/* Release a scratch register obtained from the preceding function. */
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+/* Release a scratch register obtained from the preceding function.
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+
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+ If RELEASE_VIA_POP is true, we just pop the register off the stack
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+ to release it. This is what non-Linux systems use with -fstack-check.
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+
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+ Otherwise we use OFFSET to locate the saved register and the
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+ allocated stack space becomes part of the local frame and is
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+ deallcated by the epilogue. */
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static void
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-release_scratch_register_on_entry (struct scratch_reg *sr)
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+release_scratch_register_on_entry (struct scratch_reg *sr, HOST_WIDE_INT offset,
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+ bool release_via_pop)
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{
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if (sr->saved)
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{
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- struct machine_function *m = cfun->machine;
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- rtx x, insn = emit_insn (gen_pop (sr->reg));
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+ if (release_via_pop)
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+ {
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+ struct machine_function *m = cfun->machine;
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+ rtx x, insn = emit_insn (gen_pop (sr->reg));
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- /* The RTX_FRAME_RELATED_P mechanism doesn't know about pop. */
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- RTX_FRAME_RELATED_P (insn) = 1;
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- x = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (UNITS_PER_WORD));
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- x = gen_rtx_SET (VOIDmode, stack_pointer_rtx, x);
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- add_reg_note (insn, REG_FRAME_RELATED_EXPR, x);
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- m->fs.sp_offset -= UNITS_PER_WORD;
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+ /* The RTX FRAME_RELATED_P mechanism doesn't know about pop. */
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+ RTX_FRAME_RELATED_P (insn) = 1;
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+ x = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (UNITS_PER_WORD));
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+ x = gen_rtx_SET (VOIDmode, stack_pointer_rtx, x);
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+ add_reg_note (insn, REG_FRAME_RELATED_EXPR, x);
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+ m->fs.sp_offset -= UNITS_PER_WORD;
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+ }
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+ else
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+ {
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+ rtx x = gen_rtx_PLUS (Pmode, stack_pointer_rtx, GEN_INT (offset));
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+ x = gen_rtx_SET (VOIDmode, sr->reg, gen_rtx_MEM (word_mode, x));
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+ emit_insn (x);
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+ }
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}
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}
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@@ -10212,7 +10229,7 @@ release_scratch_register_on_entry (struct scratch_reg *sr)
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pushed on the stack. */
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static void
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-ix86_adjust_stack_and_probe_stack_clash (const HOST_WIDE_INT size,
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+ix86_adjust_stack_and_probe_stack_clash (HOST_WIDE_INT size,
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const bool int_registers_saved)
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{
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struct machine_function *m = cfun->machine;
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@@ -10331,6 +10348,12 @@ ix86_adjust_stack_and_probe_stack_clash (const HOST_WIDE_INT size,
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struct scratch_reg sr;
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get_scratch_register_on_entry (&sr);
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+ /* If we needed to save a register, then account for any space
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+ that was pushed (we are not going to pop the register when
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+ we do the restore). */
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+ if (sr.saved)
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+ size -= UNITS_PER_WORD;
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+
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/* Step 1: round SIZE down to a multiple of the interval. */
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HOST_WIDE_INT rounded_size = size & -probe_interval;
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@@ -10379,7 +10402,9 @@ ix86_adjust_stack_and_probe_stack_clash (const HOST_WIDE_INT size,
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m->fs.cfa_reg == stack_pointer_rtx);
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dump_stack_clash_frame_info (PROBE_LOOP, size != rounded_size);
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- release_scratch_register_on_entry (&sr);
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+ /* This does not deallocate the space reserved for the scratch
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+ register. That will be deallocated in the epilogue. */
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+ release_scratch_register_on_entry (&sr, size, false);
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}
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/* Make sure nothing is scheduled before we are done. */
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@@ -10392,7 +10417,7 @@ ix86_adjust_stack_and_probe_stack_clash (const HOST_WIDE_INT size,
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pushed on the stack. */
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static void
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-ix86_adjust_stack_and_probe (const HOST_WIDE_INT size,
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+ix86_adjust_stack_and_probe (HOST_WIDE_INT size,
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const bool int_registers_saved)
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{
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/* We skip the probe for the first interval + a small dope of 4 words and
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@@ -10465,6 +10490,11 @@ ix86_adjust_stack_and_probe (const HOST_WIDE_INT size,
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get_scratch_register_on_entry (&sr);
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+ /* If we needed to save a register, then account for any space
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+ that was pushed (we are not going to pop the register when
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+ we do the restore). */
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+ if (sr.saved)
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+ size -= UNITS_PER_WORD;
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/* Step 1: round SIZE to the previous multiple of the interval. */
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@@ -10516,7 +10546,9 @@ ix86_adjust_stack_and_probe (const HOST_WIDE_INT size,
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(get_probe_interval ()
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+ dope))));
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- release_scratch_register_on_entry (&sr);
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+ /* This does not deallocate the space reserved for the scratch
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+ register. That will be deallocated in the epilogue. */
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+ release_scratch_register_on_entry (&sr, size, false);
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}
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gcc_assert (cfun->machine->fs.cfa_reg != stack_pointer_rtx);
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@@ -10669,7 +10701,7 @@ ix86_emit_probe_stack_range (HOST_WIDE_INT first, HOST_WIDE_INT size,
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sr.reg),
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rounded_size - size));
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- release_scratch_register_on_entry (&sr);
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+ release_scratch_register_on_entry (&sr, size, true);
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}
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/* Make sure nothing is scheduled before we are done. */
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diff --git a/gcc/testsuite/gcc.target/i386/pr84128.c b/gcc/testsuite/gcc.target/i386/pr84128.c
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new file mode 100644
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index 0000000..a8323fd
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--- /dev/null
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+++ b/gcc/testsuite/gcc.target/i386/pr84128.c
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@@ -0,0 +1,30 @@
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+/* { dg-do run } */
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+/* { dg-options "-O2 -march=i686 -mtune=generic -fstack-clash-protection" } */
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+/* { dg-require-effective-target ia32 } */
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+
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+__attribute__ ((noinline, noclone, weak, regparm (3)))
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+int
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+f1 (long arg0, int (*pf) (long, void *))
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+{
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+ unsigned char buf[32768];
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+ return pf (arg0, buf);
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+}
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+
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+__attribute__ ((noinline, noclone, weak))
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+int
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+f2 (long arg0, void *ignored)
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+{
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+ if (arg0 != 17)
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+ __builtin_abort ();
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+ return 19;
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+}
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+
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+int
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+main (void)
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+{
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+ if (f1 (17, f2) != 19)
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+ __builtin_abort ();
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+ return 0;
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+}
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+
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+
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