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415 lines
14 KiB
415 lines
14 KiB
![]()
6 years ago
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commit 4361c221ff4b53f585a2e8c0ba38956c8132609f
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Author: hjl <hjl@138bc75d-0d04-0410-961f-82ee72b054a4>
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Date: Mon Feb 26 15:29:30 2018 +0000
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i386: Update -mfunction-return= for return with pop
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When -mfunction-return= is used, simple_return_pop_internal should pop
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return address into ECX register, adjust stack by bytes to pop from stack
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and jump to the return thunk via ECX register.
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Tested on i686 and x86-64.
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PR target/84530
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* config/i386/i386-protos.h (ix86_output_indirect_jmp): Remove
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the bool argument.
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(ix86_output_indirect_function_return): New prototype.
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(ix86_split_simple_return_pop_internal): Likewise.
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* config/i386/i386.c (indirect_return_via_cx): New.
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(indirect_return_via_cx_bnd): Likewise.
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(indirect_thunk_name): Handle return va CX_REG.
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(output_indirect_thunk_function): Create alias for
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__x86_return_thunk_[re]cx and __x86_return_thunk_[re]cx_bnd.
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(ix86_output_indirect_jmp): Remove the bool argument.
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(ix86_output_indirect_function_return): New function.
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(ix86_split_simple_return_pop_internal): Likewise.
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* config/i386/i386.md (*indirect_jump): Don't pass false
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to ix86_output_indirect_jmp.
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(*tablejump_1): Likewise.
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(simple_return_pop_internal): Change it to define_insn_and_split.
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Call ix86_split_simple_return_pop_internal to split it for
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-mfunction-return=.
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(simple_return_indirect_internal): Call
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ix86_output_indirect_function_return instead of
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ix86_output_indirect_jmp.
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gcc/testsuite/
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PR target/84530
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* gcc.target/i386/ret-thunk-22.c: New test.
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* gcc.target/i386/ret-thunk-23.c: Likewise.
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* gcc.target/i386/ret-thunk-24.c: Likewise.
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* gcc.target/i386/ret-thunk-25.c: Likewise.
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* gcc.target/i386/ret-thunk-26.c: Likewise.
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git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@257992 138bc75d-0d04-0410-961f-82ee72b054a4
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diff --git a/gcc/config/i386/i386-protos.h b/gcc/config/i386/i386-protos.h
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index 4e4b2100f79..394d4aebf96 100644
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--- a/gcc/config/i386/i386-protos.h
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+++ b/gcc/config/i386/i386-protos.h
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@@ -306,8 +306,10 @@ extern enum attr_cpu ix86_schedule;
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#endif
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extern const char * ix86_output_call_insn (rtx insn, rtx call_op);
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-extern const char * ix86_output_indirect_jmp (rtx call_op, bool ret_p);
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+extern const char * ix86_output_indirect_jmp (rtx call_op);
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extern const char * ix86_output_function_return (bool long_p);
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+extern const char * ix86_output_indirect_function_return (rtx ret_op);
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+extern void ix86_split_simple_return_pop_internal (rtx);
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#ifdef RTX_CODE
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/* Target data for multipass lookahead scheduling.
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diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
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index c25d26ca826..a8238a001ee 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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@@ -8777,6 +8777,9 @@ static bool indirect_thunk_needed = false;
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by call and return thunks functions. */
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static int indirect_thunks_used;
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+/* True if return thunk function via CX is needed. */
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+static bool indirect_return_via_cx;
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+
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#ifndef INDIRECT_LABEL
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# define INDIRECT_LABEL "LIND"
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#endif
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@@ -8786,26 +8789,29 @@ static int indirect_thunks_used;
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static void
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indirect_thunk_name (char name[32], int regno, bool ret_p)
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{
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- if (regno >= 0 && ret_p)
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+ if (regno != INVALID_REGNUM && regno != CX_REG && ret_p)
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gcc_unreachable ();
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if (USE_HIDDEN_LINKONCE)
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{
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- if (regno >= 0)
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+ const char *prefix;
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+
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+ prefix = "";
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+
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+ const char *ret = ret_p ? "return" : "indirect";
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+
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+ if (regno != INVALID_REGNUM)
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{
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const char *reg_prefix;
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if (LEGACY_INT_REGNO_P (regno))
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reg_prefix = TARGET_64BIT ? "r" : "e";
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else
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reg_prefix = "";
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- sprintf (name, "__x86_indirect_thunk_%s%s",
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- reg_prefix, reg_names[regno]);
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+ sprintf (name, "__x86_%s_thunk%s_%s%s",
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+ ret, prefix, reg_prefix, reg_names[regno]);
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}
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else
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- {
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- const char *ret = ret_p ? "return" : "indirect";
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- sprintf (name, "__x86_%s_thunk", ret);
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- }
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+ sprintf (name, "__x86_%s_thunk%s", ret, prefix);
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}
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else
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{
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@@ -8947,9 +8953,18 @@ output_indirect_thunk_function (int regno)
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ASM_OUTPUT_LABEL (asm_out_file, name);
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}
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- if (regno < 0)
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+ /* Create alias for __x86_return_thunk or
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+ __x86_return_thunk_ecx. */
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+ bool need_alias;
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+ if (regno == INVALID_REGNUM)
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+ need_alias = true;
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+ else if (regno == CX_REG)
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+ need_alias = indirect_return_via_cx;
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+ else
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+ need_alias = false;
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+
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+ if (need_alias)
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{
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- /* Create alias for __x86.return_thunk/__x86.return_thunk_bnd. */
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char alias[32];
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indirect_thunk_name (alias, regno, true);
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@@ -24704,21 +24719,21 @@ ix86_output_indirect_branch (rtx call_op, const char *xasm,
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else
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ix86_output_indirect_branch_via_push (call_op, xasm, sibcall_p);
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}
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+
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/* Output indirect jump. CALL_OP is the jump target. Jump is a
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function return if RET_P is true. */
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const char *
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-ix86_output_indirect_jmp (rtx call_op, bool ret_p)
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+ix86_output_indirect_jmp (rtx call_op)
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{
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if (cfun->machine->indirect_branch_type != indirect_branch_keep)
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{
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struct ix86_frame frame;
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ix86_compute_frame_layout (&frame);
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- /* We can't have red-zone if this isn't a function return since
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- "call" in the indirect thunk pushes the return address onto
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- stack, destroying red-zone. */
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- if (!ret_p && frame.red_zone_size != 0)
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+ /* We can't have red-zone since "call" in the indirect thunk
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+ pushes the return address onto the stack, destroying the red-zone. */
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+ if (frame.red_zone_size != 0)
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gcc_unreachable ();
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ix86_output_indirect_branch (call_op, "%0", true);
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@@ -24759,6 +24774,75 @@ ix86_output_function_return (bool long_p)
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return "rep%; ret";
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}
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+/* Output indirect function return. RET_OP is the function return
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+ target. */
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+
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+const char *
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+ix86_output_indirect_function_return (rtx ret_op)
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+{
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+ if (cfun->machine->function_return_type != indirect_branch_keep)
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+ {
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+ char thunk_name[32];
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+ enum indirect_thunk_prefix need_prefix
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+ = indirect_thunk_need_prefix (current_output_insn);
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+ unsigned int regno = REGNO (ret_op);
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+ gcc_assert (regno == CX_REG);
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+
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+ if (cfun->machine->function_return_type
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+ != indirect_branch_thunk_inline)
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+ {
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+ bool need_thunk = (cfun->machine->function_return_type
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+ == indirect_branch_thunk);
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+ indirect_thunk_name (thunk_name, regno, need_prefix, true);
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+ if (need_thunk)
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+ {
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+ indirect_return_via_cx = true;
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+ indirect_thunks_used |= 1 << CX_REG;
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+ }
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+ fprintf (asm_out_file, "\tjmp\t%s\n", thunk_name);
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+ }
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+ else
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+ output_indirect_thunk (need_prefix, regno);
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+
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+ return "";
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+ }
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+ else
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+ return "jmp\t%A0";
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+}
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+
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+/* Split simple return with popping POPC bytes from stack to indirect
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+ branch with stack adjustment . */
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+
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+void
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+ix86_split_simple_return_pop_internal (rtx popc)
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+{
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+ struct machine_function *m = cfun->machine;
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+ rtx ecx = gen_rtx_REG (SImode, CX_REG);
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+ rtx insn;
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+
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+ /* There is no "pascal" calling convention in any 64bit ABI. */
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+ gcc_assert (!TARGET_64BIT);
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+
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+ insn = emit_insn (gen_pop (ecx));
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+ m->fs.cfa_offset -= UNITS_PER_WORD;
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+ m->fs.sp_offset -= UNITS_PER_WORD;
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+
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+ rtx x = plus_constant (Pmode, stack_pointer_rtx, 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_CFA_ADJUST_CFA, x);
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+ add_reg_note (insn, REG_CFA_REGISTER, gen_rtx_SET (VOIDmode, ecx, pc_rtx));
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+ RTX_FRAME_RELATED_P (insn) = 1;
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+
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+ x = gen_rtx_PLUS (Pmode, stack_pointer_rtx, popc);
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+ x = gen_rtx_SET (VOIDmode, stack_pointer_rtx, x);
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+ insn = emit_insn (x);
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+ add_reg_note (insn, REG_CFA_ADJUST_CFA, x);
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+ RTX_FRAME_RELATED_P (insn) = 1;
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+
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+ /* Now return address is in ECX. */
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+ emit_jump_insn (gen_simple_return_indirect_internal (ecx));
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+}
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+
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/* Output the assembly for a call instruction. */
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const char *
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diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
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index 228f8f6d77a..3320ec233d2 100644
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--- a/gcc/config/i386/i386.md
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+++ b/gcc/config/i386/i386.md
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@@ -11282,7 +11282,7 @@
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(define_insn "*indirect_jump"
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[(set (pc) (match_operand:W 0 "indirect_branch_operand" "rw"))]
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""
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- "* return ix86_output_indirect_jmp (operands[0], false);"
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+ "* return ix86_output_indirect_jmp (operands[0]);"
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[(set (attr "type")
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(if_then_else (match_test "(cfun->machine->indirect_branch_type
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!= indirect_branch_keep)")
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@@ -11336,7 +11336,7 @@
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[(set (pc) (match_operand:W 0 "indirect_branch_operand" "rw"))
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(use (label_ref (match_operand 1)))]
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""
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- "* return ix86_output_indirect_jmp (operands[0], false);"
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+ "* return ix86_output_indirect_jmp (operands[0]);"
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[(set (attr "type")
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(if_then_else (match_test "(cfun->machine->indirect_branch_type
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!= indirect_branch_keep)")
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@@ -11769,11 +11769,14 @@
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(set_attr "prefix_rep" "1")
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(set_attr "modrm" "0")])
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-(define_insn "simple_return_pop_internal"
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+(define_insn_and_split "simple_return_pop_internal"
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[(simple_return)
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(use (match_operand:SI 0 "const_int_operand"))]
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"reload_completed"
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"ret\t%0"
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+ "&& cfun->machine->function_return_type != indirect_branch_keep"
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+ [(const_int 0)]
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+ "ix86_split_simple_return_pop_internal (operands[0]); DONE;"
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[(set_attr "length" "3")
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(set_attr "atom_unit" "jeu")
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(set_attr "length_immediate" "2")
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@@ -11783,7 +11786,7 @@
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[(simple_return)
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(use (match_operand:SI 0 "register_operand" "r"))]
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"reload_completed"
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- "* return ix86_output_indirect_jmp (operands[0], true);"
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+ "* return ix86_output_indirect_function_return (operands[0]);"
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[(set (attr "type")
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(if_then_else (match_test "(cfun->machine->indirect_branch_type
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!= indirect_branch_keep)")
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diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-22.c b/gcc/testsuite/gcc.target/i386/ret-thunk-22.c
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new file mode 100644
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index 00000000000..89e086de97b
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--- /dev/null
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+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-22.c
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@@ -0,0 +1,15 @@
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+/* PR target/r84530 */
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+/* { dg-do compile { target ia32 } } */
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+/* { dg-options "-O2 -mfunction-return=thunk" } */
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+
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+struct s { _Complex unsigned short x; };
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+struct s gs = { 100 + 200i };
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+struct s __attribute__((noinline)) foo (void) { return gs; }
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+
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+/* { dg-final { scan-assembler-times "popl\[\\t \]*%ecx" 1 } } */
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+/* { dg-final { scan-assembler "lea\[l\]?\[\\t \]*4\\(%esp\\), %esp" } } */
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+/* { dg-final { scan-assembler "jmp\[ \t\]*__x86_return_thunk_ecx" } } */
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+/* { dg-final { scan-assembler "jmp\[ \t\]*\.LIND" } } */
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+/* { dg-final { scan-assembler "call\[ \t\]*\.LIND" } } */
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+/* { dg-final { scan-assembler {\tpause} } } */
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+/* { dg-final { scan-assembler {\tlfence} } } */
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diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-23.c b/gcc/testsuite/gcc.target/i386/ret-thunk-23.c
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new file mode 100644
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index 00000000000..43f0ccaa854
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--- /dev/null
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+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-23.c
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@@ -0,0 +1,15 @@
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+/* PR target/r84530 */
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+/* { dg-do compile { target ia32 } } */
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+/* { dg-options "-O2 -mfunction-return=thunk-extern" } */
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+
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+struct s { _Complex unsigned short x; };
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+struct s gs = { 100 + 200i };
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+struct s __attribute__((noinline)) foo (void) { return gs; }
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+
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+/* { dg-final { scan-assembler-times "popl\[\\t \]*%ecx" 1 } } */
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+/* { dg-final { scan-assembler "lea\[l\]?\[\\t \]*4\\(%esp\\), %esp" } } */
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+/* { dg-final { scan-assembler "jmp\[ \t\]*__x86_return_thunk_ecx" } } */
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+/* { dg-final { scan-assembler-not "jmp\[ \t\]*\.LIND" } } */
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+/* { dg-final { scan-assembler-not "call\[ \t\]*\.LIND" } } */
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+/* { dg-final { scan-assembler-not {\tpause} } } */
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+/* { dg-final { scan-assembler-not {\tlfence} } } */
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diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-24.c b/gcc/testsuite/gcc.target/i386/ret-thunk-24.c
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new file mode 100644
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index 00000000000..8729e35147e
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--- /dev/null
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+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-24.c
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@@ -0,0 +1,15 @@
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+/* PR target/r84530 */
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+/* { dg-do compile { target ia32 } } */
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+/* { dg-options "-O2 -mfunction-return=thunk-inline" } */
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+
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+struct s { _Complex unsigned short x; };
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+struct s gs = { 100 + 200i };
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+struct s __attribute__((noinline)) foo (void) { return gs; }
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+
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+/* { dg-final { scan-assembler-times "popl\[\\t \]*%ecx" 1 } } */
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+/* { dg-final { scan-assembler "lea\[l\]?\[\\t \]*4\\(%esp\\), %esp" } } */
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||
|
+/* { dg-final { scan-assembler-not "jmp\[ \t\]*__x86_return_thunk_ecx" } } */
|
||
|
+/* { dg-final { scan-assembler "jmp\[ \t\]*\.LIND" } } */
|
||
|
+/* { dg-final { scan-assembler "call\[ \t\]*\.LIND" } } */
|
||
|
+/* { dg-final { scan-assembler {\tpause} } } */
|
||
|
+/* { dg-final { scan-assembler {\tlfence} } } */
|
||
|
diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-25.c b/gcc/testsuite/gcc.target/i386/ret-thunk-25.c
|
||
|
new file mode 100644
|
||
|
index 00000000000..f73553c9a9f
|
||
|
--- /dev/null
|
||
|
+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-25.c
|
||
|
@@ -0,0 +1,14 @@
|
||
|
+/* PR target/r84530 */
|
||
|
+/* { dg-do compile { target ia32 } } */
|
||
|
+/* { dg-options "-O2 -mfunction-return=thunk -fno-pic" } */
|
||
|
+
|
||
|
+struct s { _Complex unsigned short x; };
|
||
|
+struct s gs = { 100 + 200i };
|
||
|
+struct s __attribute__((noinline)) foo (void) { return gs; }
|
||
|
+
|
||
|
+/* { dg-final { scan-assembler-times "popl\[\\t \]*%ecx" 1 } } */
|
||
|
+/* { dg-final { scan-assembler "lea\[l\]?\[\\t \]*4\\(%esp\\), %esp" } } */
|
||
|
+/* { dg-final { scan-assembler "jmp\[ \t\]*\.LIND" } } */
|
||
|
+/* { dg-final { scan-assembler "call\[ \t\]*\.LIND" } } */
|
||
|
+/* { dg-final { scan-assembler {\tpause} } } */
|
||
|
+/* { dg-final { scan-assembler {\tlfence} } } */
|
||
|
diff --git a/gcc/testsuite/gcc.target/i386/ret-thunk-26.c b/gcc/testsuite/gcc.target/i386/ret-thunk-26.c
|
||
|
new file mode 100644
|
||
|
index 00000000000..9144e988735
|
||
|
--- /dev/null
|
||
|
+++ b/gcc/testsuite/gcc.target/i386/ret-thunk-26.c
|
||
|
@@ -0,0 +1,40 @@
|
||
|
+/* PR target/r84530 */
|
||
|
+/* { dg-do run } */
|
||
|
+/* { dg-options "-Os -mfunction-return=thunk" } */
|
||
|
+
|
||
|
+struct S { int i; };
|
||
|
+__attribute__((const, noinline, noclone))
|
||
|
+struct S foo (int x)
|
||
|
+{
|
||
|
+ struct S s;
|
||
|
+ s.i = x;
|
||
|
+ return s;
|
||
|
+}
|
||
|
+
|
||
|
+int a[2048], b[2048], c[2048], d[2048];
|
||
|
+struct S e[2048];
|
||
|
+
|
||
|
+__attribute__((noinline, noclone)) void
|
||
|
+bar (void)
|
||
|
+{
|
||
|
+ int i;
|
||
|
+ for (i = 0; i < 1024; i++)
|
||
|
+ {
|
||
|
+ e[i] = foo (i);
|
||
|
+ a[i+2] = a[i] + a[i+1];
|
||
|
+ b[10] = b[10] + i;
|
||
|
+ c[i] = c[2047 - i];
|
||
|
+ d[i] = d[i + 1];
|
||
|
+ }
|
||
|
+}
|
||
|
+
|
||
|
+int
|
||
|
+main ()
|
||
|
+{
|
||
|
+ int i;
|
||
|
+ bar ();
|
||
|
+ for (i = 0; i < 1024; i++)
|
||
|
+ if (e[i].i != i)
|
||
|
+ __builtin_abort ();
|
||
|
+ return 0;
|
||
|
+}
|