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next
(single-step with skip, every line)
nexti
(single-step with skip, every mnemonic)
Operation
Single-steps the target program from the current PC address. The basic operations here are the same as with step and stepi,
except that when a function or subroutine call is encountered, all lines or instructions in the called function or subroutine are
executed successively as one step until returning to a higher level.
next: Single-steps the program by executing one source line at a time. In C sources, one line of C instruction
(all multiple expanded mnemonics) are executed as one step. In assembly sources, instructions are executed the same way as
for nexti.
nexti: Single-steps the program by executing one assembler instruction (in mnemonic units) at a time.
In addition to one line or instruction, a number of steps to execute can also be specified.
However, even before all specified steps are completed, the program may be halted by one of the following causes:
Already set break conditions are met.
The [Suspend] button is clicked.
Format
next [Count]
nexti [Count]
Count:
Number of steps to execute (decimal or hexadecimal)
One step is assumed if omitted.
Conditions: 1 ≤ Count ≤ 0x7fffffff
Usage example
■Example 1
(gdb) next
The source line displayed on the current PC is executed. When the source is a function or subroutine call, the function or
subroutine called is also executed until returning to a higher level.
■Example 2
(gdb) nexti
The instruction (in mnemonic units) is executed at the address displayed on the current PC. When the instruction is a
subroutine call, the subroutine called is also executed until returning to a higher level.
■Example 3
(gdb) next 10
sub (k=5) at main.c:20
Ten lines are executed from the source line displayed on the current PC.
■Example 4
(gdb) nexti 10
main () at main.c:13
Ten instructions (in mnemonic units) are executed from the address displayed on the current PC.
Notes
The program cannot be single-stepped from an address that does not have source information (i.e., debugging information
included in the object). The program can be run continuously, however, by using the continue command.
To run the program from the beginning, execute c17 rst (reset) before next or nexti.
Even with nexti, ext-based extended instructions are executed collectively (i.e., entire extended instruction set consisting
of two or three instructions) as one step.
Interrupts are accepted even while single-stepping the program.
Similarly, the halt and slp instructions are executed while single-stepping the program, causing the CPU to enter standby
mode. The CPU exits standby mode when an external interrupt is generated. Clicking the [Suspend] button also releases the
CPU from standby mode.
S5U1C17001C Manual
(Rev. 1.0)
Seiko Epson Corporation
8 Debugger
[ICD Mini / SIM]
8-25
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