141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
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/* Unwinder test program.
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Copyright 2006-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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void tpcs_frame (void);
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void switch_stack_to_same (void);
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void switch_stack_to_other (void);
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int
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main (void)
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{
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tpcs_frame ();
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switch_stack_to_same ();
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switch_stack_to_other ();
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return 0;
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}
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/* Normally Thumb functions use r7 as the frame pointer. However,
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with the GCC option -mtpcs-frame, they may use fp instead. Make
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sure that the prologue analyzer can handle this. */
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asm(".text\n"
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" .align 2\n"
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" .thumb_func\n"
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" .code 16\n"
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"tpcs_frame_1:\n"
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" sub sp, #16\n"
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" push {r7}\n"
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" add r7, sp, #20\n"
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" str r7, [sp, #8]\n"
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" mov r7, pc\n"
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" str r7, [sp, #16]\n"
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" mov r7, fp\n"
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" str r7, [sp, #4]\n"
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" mov r7, lr\n"
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" str r7, [sp, #12]\n"
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" add r7, sp, #16\n"
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" mov fp, r7\n"
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" mov r7, sl\n"
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" push {r7}\n"
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/* We'll set a breakpoint at this call. We can't hardcode a trap
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instruction; the right instruction to use varies too much. And
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we can't use a global label, because GDB will think that's the
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start of a new function. So, this slightly convoluted
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technique. */
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".Ltpcs:\n"
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" nop\n"
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" pop {r2}\n"
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" mov sl, r2\n"
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" pop {r7}\n"
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" pop {r1, r2}\n"
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" mov fp, r1\n"
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" mov sp, r2\n"
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" bx lr\n"
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" .align 2\n"
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" .type tpcs_offset, %object\n"
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"tpcs_offset:\n"
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" .word .Ltpcs - tpcs_frame_1\n"
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" .align 2\n"
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" .thumb_func\n"
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" .code 16\n"
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"tpcs_frame:\n"
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" sub sp, #16\n"
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" push {r7}\n"
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" add r7, sp, #20\n"
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" str r7, [sp, #8]\n"
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" mov r7, pc\n"
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" str r7, [sp, #16]\n"
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" mov r7, fp\n"
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" str r7, [sp, #4]\n"
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" mov r7, lr\n"
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" str r7, [sp, #12]\n"
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" add r7, sp, #16\n"
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" mov fp, r7\n"
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" mov r7, sl\n"
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" push {r7}\n"
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/* Clobber saved regs around the call. */
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" mov r7, #0\n"
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" mov lr, r7\n"
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" bl tpcs_frame_1\n"
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" pop {r2}\n"
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" mov sl, r2\n"
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" pop {r7}\n"
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" pop {r1, r2, r3}\n"
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" mov fp, r1\n"
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" mov sp, r2\n"
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" mov lr, r3\n"
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" bx lr\n"
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);
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asm(".text\n"
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" .align 2\n"
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" .thumb_func\n"
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" .code 16\n"
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"write_sp:\n"
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" mov sp, r0\n"
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" bx lr\n"
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" .align 2\n"
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" .thumb_func\n"
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" .code 16\n"
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"switch_stack_to_same:\n"
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" push {lr}\n"
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" mov r0, sp\n"
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" bl write_sp\n"
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" pop {r1}\n"
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" bx r1\n"
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" .align 2\n"
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" .thumb_func\n"
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" .code 16\n"
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"switch_stack_to_other:\n"
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" push {lr}\n"
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" mov r7, sp\n"
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" mov r0, #128\n"
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" bl write_sp\n"
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" mov sp, r7\n"
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" pop {r1}\n"
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" bx r1\n");
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