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arc: Add DWARF2 alternate CFA column.

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Add DWARF 2 CFA column which tracks the return address from a signal
handler context.  This value must not correspond to a hard register
and must be out of the range of DWARF_FRAME_REGNUM().

gcc/
	* config/arc/arc.h (DWARF_FRAME_REGNUM): Update definition.
	(DWARF_FRAME_RETURN_COLUMN): Use RETURN_ADDR_REGNUM macro.
	(INCOMING_RETURN_ADDR_RTX): Likewise.
	(DWARF_ALT_FRAME_RETURN_COLUMN): Define.

gcc/testsuite/
	* gcc.target/arc/cancel-1.c: New file.

libgcc/
	* config/arc/linux-unwind.h (arc_fallback_frame_state): Use
	DWARF_ALT_FRAME_RETURN_COLUMN macro.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
This commit is contained in:
Claudiu Zissulescu 2022-01-05 15:22:10 +02:00
parent b3989a7b10
commit 68a650ba57
3 changed files with 44 additions and 7 deletions
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11
gcc/config/arc/arc.h
View File

@ -1356,7 +1356,7 @@ do { \
: (REGNO))
/* Use gcc hard register numbering for eh_frame. */
#define DWARF_FRAME_REGNUM(REG) (REG)
#define DWARF_FRAME_REGNUM(REG) ((REG) < 144 ? REG : INVALID_REGNUM)
/* Map register numbers held in the call frame info that gcc has
collected using DWARF_FRAME_REGNUM to those that should be output
@ -1370,9 +1370,14 @@ do { \
: 57 + !!TARGET_MULMAC_32BY16_SET) /* MLO */ \
: (REGNO))
#define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (31)
/* The DWARF 2 CFA column which tracks the return address. */
#define DWARF_FRAME_RETURN_COLUMN RETURN_ADDR_REGNUM
#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, RETURN_ADDR_REGNUM)
#define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, 31)
/* The DWARF 2 CFA column which tracks the return address from a signal handler
context. This value must not correspond to a hard register and must be out
of the range of DWARF_FRAME_REGNUM(). */
#define DWARF_ALT_FRAME_RETURN_COLUMN 144
/* Frame info. */

31
gcc/testsuite/gcc.target/arc/cancel-1.c Normal file
View File

@ -0,0 +1,31 @@
/* Test for cleanups with pthread_cancel. Any issue with libgcc's unwinder
will cause this test to spin in pthread_join. */
/* { dg-do run } */
/* { dg-require-effective-target pthread } */
/* { dg-options "-pthread" } */
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
void *thread_loop (void *)
{
while (1)
{
printf("worker: loop\n");
sleep(1);
}
}
int main ()
{
pthread_t thread;
pthread_create (&thread, 0, thread_loop, 0);
sleep(5);
pthread_cancel (thread);
pthread_join (thread, 0);
return 0;
}

9
libgcc/config/arc/linux-unwind.h
View File

@ -120,10 +120,11 @@ arc_fallback_frame_state (struct _Unwind_Context *context,
= ((_Unwind_Ptr) &(regs[i])) - new_cfa;
}
fs->regs.reg[31].how = REG_SAVED_VAL_OFFSET;
fs->regs.reg[31].loc.offset = ((_Unwind_Ptr) (regs[ret])) - new_cfa;
fs->retaddr_column = 31;
fs->signal_frame = 1;
fs->retaddr_column = __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__;
fs->regs.reg[fs->retaddr_column].how = REG_SAVED_VAL_OFFSET;
fs->regs.reg[fs->retaddr_column].loc.offset =
((_Unwind_Ptr) (regs[ret])) - new_cfa;
return _URC_NO_REASON;
}